watch the video of me flying my new little one
http://www.youtube.com/watch?v=U6gCFlJN2Vw
Great Job Santhosh {:)}
I liked your heli pad. :giggle:
just love those 250's nice video Santhosh!
your DIY helipad looks promising too...
Seems like you took over some country road :giggle:
Where is this ?
And when will we see some forward flight action on this heli ? ;)
its our club house we usually meet.its a beautiful heli i think i can fly inside the room like a co axial one. i will try forward flight and all only after collecting some spares
you have a good setup... my first 250 used to wag like a happy dog, and try not to fly this indoors..
Quote from: sujju on September 26, 2010, 09:20:49 PM
you have a good setup... my first 250 used to wag like a happy dog, and try not to fly this indoors..
all setup is done by our anwar bhai,tnx anwar for giving me such a beautiful heli
hi there
am a newbie in rc helis...got a trex250combo kit recently and need advise on a gyro which is light on the pocket and also would take me safely through the hovering phase of flying it....will buy a good gyro once am confident i can fly it around....ds420 on the tail...please help! :help:
PS:i did buy a cheap e-tech g106 gyro but after going through many reviews iv decided to give it a second thought bfore using it ???
hi.. i might sound very repetative here... but pls do not compromise on the gyro... this is the core for steady flying...there are a lot of cheap gyros if you want and i can give the references but again the 250 is known to wag a lot and this "might" increase your frustration on the hobby itself... my 2 bits worth... and if you are on a budget let me know and i will try to find one for you that might fit your bill..
Totally +1 for what Sujju bhai said. If you want to spend money on one thing with these helis, it is the gyro/servo combination.
I have seen multiple 250s flying very stable, with the newer gyro/servo combo from Align itself (GP780 / DS420).
hi thank you for replying....i understand wat you guys mean but right now my budget is a little tight and am desperate to see the 250 flying....i guess i can manage a gyro costing within 40$ range....meanwhile will try saving up for the better ones...
with usd 40 am sure you can find a good gyro but second hand, if you want me to check around i can do the same but let me know as i am coming to bangalore in 2 weeks time and i can carry it with me if you want me to..
I don't want to sound cheap here but Go for HK401B Gyro .and any digital servo .. you will be surprised with the performance. The Gyro will cost you around $18 with registered shipping from hobbyking.com
Hellyflyer
Unfortunately, this is one of those helis where tail setup is critical, and many people had problems even with the original Futaba gyros.
Quote from: anwar on October 26, 2010, 02:22:09 AM
Unfortunately, this is one of those helis where tail setup is critical, and many people had problems even with the original Futaba gyros.
Wow!! I was not aware of this special feature of this heli..In that case save some money and go for the Align setup (Gyro and Servo) at least you won't regret it
Hellyflyer
hi sujju
i appreciate your help ;D would be great if i got a good gyro...right now am not in bangalore...but let me know when you get a gyro and i will contact you....
thanks again
:)
hi anwar
i hope i could have my 250 setup by you....any chances of you coming to bangalore in the near future?
No immediate plans :(
If anyone else is getting an original Align 250, I would strongly recommend their "super combo", as it comes receiver ready, with good quality electronics.
ok bad luck then...but i would definitely keep asking you tips as i live in davangere right now where there are no rc flyers...thank you
do you have the SE version??? if not its worth to try out the chinese weight mod... also check on jasmine's vids on helifreak and on the mod there is another person who sells the bearings and the chinese weights on helifreak if you want to do this i can find it out for you
i have the older version not the SE....do all non SE 250s need to undergo these mods?...
The Chinese weight mod significantly helps tail performance, so it is highly recommended on this model which is known to have a sensitive tail.
I would say try to build and fly it, and do the mod if needed.
hey anwar bhai
is it by anyways possible that i courier my trex 250 to you with all the electronics and you could set it up for me?...am not sure if this is practical enough...would be eternally grateful to you if u agreed :bow:
i dont have anyone to help me out here :'(
I am living outside the country ;) Plus, there is no magic to it, except to follow certains steps diligently.
I know at least two people in Bangalore who can build it very nicely :) Let me know, and I will PM you the details.
ok that sounds good :)....kindly PM me the details soon...il be going to bangalore in november last week...wil try to get it set up then.. ;)
guys one more question...apart from futaba gy401 and align gyros which other ones are suitable for ds420 on the tail...?and what do you think about the ds420/gy401 combo?
Quote from: sujju on October 25, 2010, 10:17:43 PM
and if you are on a budget let me know and i will try to find one for you that might fit your bill..
hey sujju can i have your contact no. please....
doc, I was talking about this one:
http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=11958
got it thanks Vinay!
Quote from: anwar on October 26, 2010, 12:04:45 AM
I have seen multiple 250s flying very stable, with the newer gyro/servo combo from Align itself (GP780 / DS420).
hi anwar bhai
can i use this Turnigy® Mini MEMS GYRO
http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=11958
No reviews at the site at, I think if its not urgent, you can wait for some time.
Buying a second hand gyro is a good option when u know the seller, or else you will never know if it has been in a crash.
I think experienced people will be in a better place to comment on these.
rccrazydoc... i have a align gyro from my trex 250 which i dont fly nowadays and also a few gy401's, spartan, solid G, logitec, hitec gyros...i live in bahrain and will pm you my contact ..
awesome sujju...let me know if u can give one of them to me....il pay you through money transfer or cheque or something...
Sujju, is that a gyro shop there? ;D
Quote from: vinay on October 27, 2010, 07:09:26 PM
doc, I was talking about this one:
http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=11958
You can get one of the other known brands for the same price or a bit more (second hand).
u speaking about intertia nano?
More like rcgroups, runryder, rcuniverse, ebay etc to source better/brands gyros at similar costs as that new Turnigy one.
Quote from: anwar on October 28, 2010, 01:56:14 PM
More like rcgroups, runryder, rcuniverse, ebay etc to source better/brands gyros at similar costs as that new Turnigy one.
am scouting through these sites anwar bhai...hopefully will find a good deal
how is align gp780?there are some good deals available...
That is what I have seen most widely used. But pair it with the DS420 servo.
Quote from: anwar on October 28, 2010, 02:10:18 PM
That is what I have seen most widely used. But pair it with the DS420 servo.
great then i hope i get a good deal....will keep you guys updated...thanks a lot...
hi guys long time!...good news and bad news..my trex is complete :thumbsup: and after bugging my heli gurus in b'lore i.e. Vinay and Rajesh i finally set it up {:)} must say its a beautiful bird ;) and the bad news is after hovering 2 packs for the very first time crashed it due to a small gust! :banghead: but was worth everything...landed up with
a broken tail boom,
bent tail rotor shaft
and guess i damaged the one way bearing
meanwhile practicing on my hbcp3..
and ya i finally sorted out the tail on my 250...ds420-gp780 works great!
btw it was my first ever hover and god what a beautiful sight watching your hard work fly in front of you.. :P ;D
Well, mostly good news, with a tiny bit of bad news sprinkled on it :)
I would assume that pictures/videos were taken of this historic event in the good doctor's life ;)
Congrats doc on your first hover! :thumbsup:
thanks guys...wil post some pics/vids soon..hopefully i should only get better at flying here on...wish me luck...and c you soon vinay;-)
Sure, will meet. Download and start using a good sim by then.
for a 250 for me it is only 1 gyro, beast x, fbl do miracles to small machines with there flimsy linkages in the head and binding problems and it cost pretty much same as a spartan gyro
Good point about getting rid of small head linkages !
For a cost conscious beginner, the stock Align setup would work pretty well. The FBL upgrade can be done any time in future too.
is sure works but after i put a mini v on the 1 i had it i had about 400% more control of the heli, and became very predicable
I believe, currently even the cheapest FBL controller (turnigy) costs 160+ USD. Price is the only down side Iam seeing. And big guys like mikado costs like 400 :o
beast x is pretty much like the old v-bar4.0 and play in a different liege compare to turnigy when it come to tail control and works good on nitro as well
v bar 5,0 is extremly good on small machines but more money for sure, 400 is a old number, v5 mini is 299 now
hi anwar bhai
i need help soon! was hovering my 250 all these days with training gear on and the tail was holding great.but today after taking them off i noticed a minor twitch/wag in the tail! gyro is in HH mode with 15 gain now(previously 25). little skeptical to go below that...what do u think might be the problem?any suggestions....
Is the wag horizontal or vertical (looking from behind the heli) ?
If it is vertical (a see-saw kind of rocking motion between the head and tail), the likely explanation is this... with the added weight of the training gear, you would need higher throttle to hover, and the more the head speed, the better the tail authority. Now when you remove the training gears, you may be hovering at a lower throttle position, which means lesser head speed and lesser tail authority. It is something to be fixed with an increase in throttle curve, and not with gyro gain.
If the wagging is horizontal and rapid, that is to be fixed with gyro gain.
Anwar, I saw his heli, He had built it very well. In fact the ball link on the tail servo was also near the center of the servo giving more resolution. Just wondering why such a low gain is required. I agree that once I came out of the training gear I had to reduce the gain on my heli, but a value of 15 is pathetic. Dunno, not much experienced here. :headscratch:
The gain is whatever you end up with, with the heli "behaving". Can't remember what gain settings we ended up with for Santhosh's 250.
The position of the ball link is on the servo arm affects the "limit" settings of the gyro.
With the training gear on, it may cause the heli to resist yaw correction, that is why a bigger gain may be needed when the training gear is on. Think of it as the gyro having to twist a bigger mass into position.
Which radio are you using ? If it is a JR/Spektrum, 15 is just fine (translates to 30 on Futaba), I run 25 on a Futaba (for Trex 600N with Logictech gyro), which would have translated to 12.5 on a JR (within a given mode... rate or HH) !
I tot the gain effects the ball link position and vice versa. since edger the ball, more the tail moves and hence lower gain is required, i remember reading this on other forum. :headscratch: Not sure where i read or in which tutorial i saw
He is using some chinese radio. Though it was cheap, I felt the stick movement FEEL to be more superior to my RDS/A highend JR/Futaba that I have used. It had a kinda ball bearing feel. I felt it was perfect for flying Helis. :thumbsup: Unfortunately he is mode 1 and I couldnt feel his heli. :(
Quote from: vinay on November 28, 2010, 09:12:38 AM
I tot the gain effects the ball link position and vice versa. since edger the ball, more the tail moves and hence lower gain is required, i remember reading this on other forum. :headscratch: Not sure where i read or in which tutorial i saw
I didn't put it down fully. On any typical gyro, the way I decide where to put the ball link on the servo is decided by looking at how much is my "limit" settings at various ball link positions (and most heli manuals come with recommendations for what distance to use). I want to get the limit settings close to 100 (between 80 and 100). After that, the gain is whatever the gain I end up with.
And yes, the gain is affected by servo arm length.
Thanks anwar for the tip. :)
Quote from: vinay on November 28, 2010, 09:16:43 AM
Unfortunately he is mode 1 and I couldnt feel his heli.
If the radio supports software switching from mode 1 to mode 2 (and vice versa), then there is a way out. I have to do this often when testing Prakkat's helis, as he flies mode 1. I flip the radio to "mode 2" from "mode 1" in software, and ensure that the throttle is held down by force (this stick was elevator in mode 1, and has spring tension). Similarly, I ensure that elevator is at the centre (it is originally the throttle, so it tends to stay where you keep). Holding the sticks by force like this, I seek someone else's help in starting up the heli. This allows me to test fly the helis on mode 1 radios with out having to rebind/reprogram it on another (mode 2) radio, or rig up some kind of buddy setup between the two radios.
Of course, I have to remember to switch the radio back to mode 1 in software when the testing is done.
hi guys sorry for the delay...going through a frustrating phase...after some good no. of hovers finally crashed the 250 yesterday....feathering shaft broke and the main shaft was bent...no other serious damages...luckily had the spares...but now the heli just refuses to fly the way it used to! the pitch mixing arms have some play...not sure if they did before the crash....play is causing about 1 deg deficit in the pitch each time i spool up.....so disassembled everything and tightened it back....slight vibration is still there...to make up for the slight deficit now, i hav increased the swash pitch mix from 50% to 55%...pitch is fine but now the tail is vibrating/rapid horizontal wags and am not able to figure out why! really miss having fellow fliers around...! would appreciate some help!
check this out.. specially the vids..
http://www.helifreak.com/showthread.php?t=107276 (http://www.helifreak.com/showthread.php?t=107276)
http://www.youtube.com/watch?v=9WmzpeQY6YA (http://www.youtube.com/watch?v=9WmzpeQY6YA)
http://www.youtube.com/watch?v=-Y1UBDJaNVo (http://www.youtube.com/watch?v=-Y1UBDJaNVo)
http://www.youtube.com/watch?v=gP2OYVEjU0Y (http://www.youtube.com/watch?v=gP2OYVEjU0Y)
http://www.youtube.com/watch?v=8IOXbuMOJfU (http://www.youtube.com/watch?v=8IOXbuMOJfU)
i eliminated my wag and used to get perfect piros and stops jsut by sanding the brass tubings...
hi sujju thank u for the reply...my tail was holding great before the crash....its not the binding problem...i guess it was coz of some loosened screws in the head causing lotta vibrations in turn causing the tail wag....well heli is kinda better now with minimal wag....will try to tweak around a bit more and see...
guys am just not able to eliminate the tail wag post crash.... :banghead: tried evrything...theres no binding problem or belt prob....am frustrated :banghead: my gain is as low as 10!! ???
Quote from: rccrazydoc on November 30, 2010, 08:38:32 AM
guys am just not able to eliminate the tail wag post crash.... :banghead: tried evrything...theres no binding problem or belt prob....am frustrated :banghead: my gain is as low as 10!! ???
what is your tail setup?
do u have vibrations?
small razor 1 is the worst
, have u tried to take off main blades and disconnect tail servo and spin up heli and feel the push rod if the tail is binding?
have u tried another tail servo or gyro?
what is the exact distance between center of screw and ball on the servo arm?
what rpm do u have? have u tried to run on 100% flat or lower?
have u tried bigger tail blades or smaller?
normally it is loads of play in the mixer arms( thats why everybody should run fbl ;o) ) but how is the blade tracking? is it out or does it go out of track and course vibes?
have u balansed the mains?
r you sure u did not bend the spindle in the tail in the crash?
well here is the checklist i've been through
new tail blade grips(SE)
tail belt -ok
new shaft
new feathering shaft
new smaller tail blades
gain range adjustment from as low as 5% to 50%
changed the main blades
changed the gyro pads
changed the tail servo
new tail push rod
belt tightness checked
adjusted the space between the motor pinion and the main gear
tail rotor shaft metal-new
no binding in the tail anywhere
push rod close to 5mm
tried lower head speed
and the wag continues
and not much of vibrations from the main rotors...
this is frustrating ...please help...its quite discouraging for a newbie...i also spooled the heli up without the main blades to full throttle and the tail is still/no wag...the moment the heli lifts up the wag starts....
Doc - Can you post a video of what you are seeing ? Please do use a zoom camera (or try to show the issue from both close by and at a small bit of distance).
Quote from: anwar on December 02, 2010, 03:10:07 PM
Doc - Can you post a video of what you are seeing ? Please do use a zoom camera (or try to show the issue from both close by and at a small bit of distance).
ok Anwar bhai will do that soon...
rgds
which hole on the servo of the tail servo have your placed the ball on?... try to be as close to the centre of the servo as possible..
rgds
hi anwar bhai...sorry coudnt shoot a vid of my heli i dont have a camera right now....well i've tried almost everything in the book to eliminate the wag but it just doesnt seem to stop..!i've almost given up!...can you pm me your contact no. if possible so that i can contact you directly regarding my issue...please help
I am out of India, so something like Skype may be better. I will send you my details, although it does make every bit of sense to see what exactly is going on. Since you are Bangalore, is it possible to borrow a cam from friends (or have them shoot some clips) ? Even a better mobile phone would do.
ya anwar bhai il do that...!il try to get a cam...anyways plz PM me your details...thank you
anwar bhai thank you for your contact details...will get back to you with some videos of my rex...meanwhile can i increase the bec voltage to 6 volts...am running stock ds410 and jr290g servos...do think it might improve the tail?and does governer mode help in trex 250?should i try that setting?
one more thing anwarbhai how do i know if the motor bearings are damaged or something? when i disconnect the motor away from the main gear n try to spin it manually i feel its a little snugged!....
The servos can handle 6v, and if you are using the GP780 gyro, it can also handle 6v. But it looks like we have to look for something else, as the 5v setup was working fine earlier. The added resolution may help, but it looks like the issues is elsewhere ! All the 250s I have seen so far are running 5v setups.
Same with the governor... for basic hovering, these should be any critical factors at all.
In the crash, did you remove and remount the gyro ?
All motors are a bit notchy in free spin, and it is hard to measure if that is bad enough from descriptions alone.
that's exactly what even am thinking that if the heli was stable before the crash,it should be now also...am baffled anwar bhai...and the gyro took no impact...actually the blades hit a wall and the heli crashed on its head....i changed the shaft and the feathering shaft and there were no other obvious damages! when i took it to hover again the wag started and since the its wagging the hell outta me!!@# :banghead: :banghead: unfortunately i dont have a spare gyro with me to swap and check! is there any other way i could see if the gyro is damaged!?
:headscratch:
anwar bhai i managed to arrange for a hd camera finally....what should be the size of the clip to upload?
HD is fancy, not a must ;) Any resolution will work (480 or 360 will be easier to upload), the important thing is to illustrate the problem in ample light and at various zoom positions.
BTW, I forgot to ask ! Are you not able to hook up with other Bangalore experts like Rajesh or Adarsh ? Vinay also has lots of experience by now with helis !
i dont kno if you remember i mentioned to you that right now am completing my post grad in a place called davangere about 6 hrs from bangalore... i am in touch with rajesh and vinay but no one here right now to help me...i have bugged them enough over the phone already ;) though i did think of meeting rajesh when i go to b'lore now, i have very less time and moreover i fly mode 1 so i cant send it across to them! :(
As i said, time to book new electronics for ur 450 GT pro belt. with Christmas arriving expect shipping delays. ;)
Quote from: vinay on November 16, 2010, 07:40:40 AM
I believe, currently even the cheapest FBL controller (turnigy) costs 160+ USD. Price is the only down side Iam seeing. And big guys like mikado costs like 400 :o
http://diydrones.com/profiles/blogs/phubar-an-open-source-heli
http://code.google.com/p/phubar/
Scrounge up the parts, and build one of your own ! ;)
Ya, but would be painfull, more than an FBL i would need a good place to fly ;)
hi anwarbhai finally i have 2 videos of my heli....camera work is ok...first try...there is a very slight wag after i fixed the gyro plate firmly to the main frame with some epoxy glue today...it was a little breezy so the gyro had some work to do..!delay at about 30%...hope you can figure out something..here are the links
http://www.youtube.com/watch?v=Av3-yn0EmcM&feature=mfu_in_order&list=UL
http://www.youtube.com/watch?v=mSTYm5SAE8I&feature=mfu_in_order&list=UL
anwar bhai after double padding the gyro and fixing the gyro tray firmly the wag is almost not there!i did some testing my self...if i land a little hard and take off again it vibrates lik crazy and if land it gently and hover it stabilizes!not able to understand what exactly is happening... if vibrations can affect a gyro sensitivity so much then how do these things manage on 700 size helis which vibrate like crazy!?compared to them am sure the 250 is nothing!
Sure i touched the tail boom before the crash and the vibrations were NIL. it was like the machine was off. lol.
Atleast compared to my HKs which vibrate like iam getting a shock :giggle: My gyros hold well though. I se slight drift some times, but thats why they are called HK stuff ;D
Quote from: rccrazydoc on December 07, 2010, 06:38:53 PM
anwar bhai after double padding the gyro and fixing the gyro tray firmly the wag is almost not there!
...
if vibrations can affect a gyro sensitivity so much then how do these things manage on 700 size helis which vibrate like crazy!?
For small helis, one layer of GOOD double sided foam tape is enough to damp the frame vibrations. On bigger helis, some gyro manufacturers insist that they be mounted with a metal plate in between two foam pads. The tail will have very small occasional vibrations, it will never be perfect as in the sims, and that is considered normal. But yours was more than what can be called normal.
Quote from: rccrazydoc on December 07, 2010, 06:38:53 PM
if i land a little hard and take off again it vibrates lik crazy and if land it gently and hover it stabilizes!
That worries me. If landing hard makes it vibrate, then either the foam padding is coming loose, or something inside the gyro must be getting affected. We have multiple bad landings on our helis (especially while training for autos), but the tail behavior is consistent. I remember the motor pinion on Santhosh's 250 came loose mid flight at about 10 feet (it was built with blue loctite as suggested in the manual, fixing again with red loctite worked better), and the heli fell from quite a bit of height and landed on the skids. Nothing happened to the tail (behavior), or anything else on the heli !
More importantly, if the tail gets better AGAIN when you stop and fly, that means something internal to the gyro must be getting affected ? :headscratch:
Overall, I noted two more things...
1. Do noy fly so close to the ground, fly at 3 feet or above
2. Seems like you can use a bit more throttle, which will give you more tail authority. I can see the tail struggling to keep up at times. So increase your throttle curve at your hovering position (and if needed, compensate by lowering the pitch curve).
so you think its the gyro then!? cant afford another gyro now! i think ill have to send the gyro across to vinay or somebody so that they can test it on their helis! what do i do now bhai?and i kept it low coz it was a little breezy! dont need another crash right now :)
You said it is already a lot better with the foam padding. Can you try a bit more head speed and see if it is better ?
Please do post some close up pictures of how you have mounted the gyro. I had my suspicions about the gyro mounting, that is why I asked the question below earlier.
Quote from: anwar on December 06, 2010, 06:47:10 PM
In the crash, did you remove and remount the gyro ?
I don't know if it is the gyro... but if a hard landing can induce tail wagging, then we need to check/suspect the gyro mounting, the gyro itself, or some other part of the heli coming loose and inducing added vibrations.
il post some pics asap! i just hope this issue gets sorted out..hurts to seea 25k paper weight :banghead: :'(
Not at all paper weight :o In fact, if you start doing forward flights RIGHT NOW, you will NOT feel any issues with the tail (assuming you got have the right throttle and pitch curves) :)
If a forward flight is done with a wagging tail, it sounds like "burr burr burr burr burr burr". Ask me how i know :giggle:. I used to fly a heli with a damaged ds480 tail servo which was wagging a lot. ;D But who cares, as long as it stays in air, I dont care if it wags or drifts, of course unless its a 25k investment and Iam learning 3D. ;)
BTW he has to yet practice nose left and nose right before FFF or just move the heli forward back ward with tail in orientation.
@doc
When u know the heli has already hit the wall, why do u want to hover in the same place? :headscratch:, that too with a dog running around ;D LOL :giggle:
Quote from: vinay on December 07, 2010, 09:08:01 PM
If a forward flight is done with a wagging tail, it sounds like "burr burr burr burr burr burr". Ask me how i know
Exactly my point... that the wag is NOT huge. If it has already got better since the video was shot, that is even better.
And I am very interested in knowing what additional head-speed does.
I doubt if he can try a FFF at this stage, and he would have used all the gyro foam I gave him. If he was here i would have tried the Align gel pad. But doubt that would solve the issue.
BTW my post number 1131 just vanished :giggle: Magic! Lol.
i thought you were talking about a lot of wag... this is not really bad, i think as anwar had stated try to increase the head speed more and the tail will get more authority... and i dont know if i had asked this earlier??... try to use the hole on the tail servo arm which is closed to the centre... this again will give a lot of authority to the servo as it will not have to work hard to find the gyro's centre point.. and pls fly a bit higher to get the right feel of the heli.. at least a mt in height
guys thank you for the response...just pray my heli gets better! and il try to mess around with the throttle and pitch curves again....maybe that might improve the tail...
sujju the arm is located at 5mm from the centre...and the wag seems better with a new outrage battery i got!
...whats the ideal pitch and th curve i need to have for the 250....right now they read like this
th curve-0,55,80,90,100
pitch curve-55(-4deg),75,85,95,100
Quote from: rccrazydoc on December 07, 2010, 09:44:11 PM
and the wag seems better with a new outrage battery i got!
That might be an indication that you need better head-speed !
Regarding pitch and throttle curve... Pitch curve is a personal preference, and throttle curve is determined by the desired performance (against battery/run time).
I keep a straight 0-100 linear pitch curve for all modes, on all helis. For beginners, I go for something like a -4, +4, +10 pitch range initially, and make minor adjustments during test flights. The intention is to get a stable hover a few clicks above mid stick.
This thread on pitch setup should be helpful :
http://www.rcindia.org/helis/hovering-point-setup/
anwar bhai, i went through the thread....i set my pitch curve now....can you give me the values for throt curve...and what exactly is gov mode? can it be used for 250s?
guys good news finally....setup a perfect thr and pitch curve and voila tail is tamed!! well atleast for 8 minutes of hover with the new outrage battery! guess it was the vibs and low headspeed that was the cause for the bad performance! and i've set delay to 0! :thumbsup: well hoping it will continue to hold well....thank you guys for all the suggestions and the help.... :bow:i still have some mechanical tuning to do...this forum and u guys rock :thumbsup: :bow: thank you anwar bhai :bow: :bow:
what is motor bearing lubricant? can i use a viscous bike chain lubricating oil? i have used it to lubricate the head and tail bearings and it helps...
Quote from: rccrazydoc on December 07, 2010, 11:03:36 PM
and i've set delay to 0!
It should have been zero all along, while using a fast tail servo like the one you have been using. The delay is to be used only when the servo is slow and cannot catch up with the demands of the gyro. Actually that may have been the main reason for your issues.
Hahaha, didnt i tell u on the phone to increase the throttle curve on the phone that day that the tail may not be getting enough authority? Shankoo ninda bandrene theertha.
Anyways, congrats on solving the problem :)
:P ;D ;D good one vinay...but that wasn't the only problem!i think i've figured out now....after the crash i had ca glued the gyro pad which caused it to harden and gp780 is quite sensitive to vibs so hence the wag!but of course other minor issues also added to it...am still not 100% satisfied with the tail....have ordered some pads and metal plate so got to try that....wag is gone for now....
Quote from: anwar on December 08, 2010, 02:34:56 AM
It should have been zero all along...
and actually anwar bhai i did start off with 0 delay initially and when the wag dint go i had to set it! :)
Metal Pad? what the heck, order a quark instead. u should not be so sensitive to the gyros. I think I should have asked you to touch the tail boom of my HK 450 at full hs ;D.
Actually the Quark comes with a metal pad, but for use on the bigger helis (from what I remember).
iam planning to mount my quarks using align gel pad.
Anwar bhai i see i've got a promotion as a senior member ;) ;D btw kindly reply to my previous post on motor bearing lubrication -post no.103 !thank you
Normally you do not have to do motor lubrication, except for some motors like Scorpion where they highly recommend it. There is already discussion on this here.
anwar bhai any videos of you or rajesh flying? want to see the pro's in action
there are many if u search this forum.
can you post some links vinay
guys got some replacement parts today....the flybar seesaw bearing had some considerable amount of play!replaced it and mounted a gyro plate also...the wag has vanished! :thumbsup:well that added a lot to my experience to deal with problems next time... :)yet to change the main gear though! tried replacing the one way bearing but ended up damaging it...better to replace the whole gear instead which costs just a few extra $....an expensive hobby i must say :o :obut worth everything!hey Vinay i guess the 450 build will have to wait for a while :(...have to start exam preps and also a little tight on budget this month...but when i start you'll be my guide through it! ;)
Quote from: rccrazydoc on December 08, 2010, 02:38:03 PM
can you post some links vinay
http://www.rcindia.org/chatter-zone/what-rc-activity-did-you-do-this-week/msg2289/#msg2289
You can find the rest from the same user on Youtube.
hi fellow fliers
merry Christmas and a very happy new year...! was out on a holiday for 12 days...!back to base camp...missed my helis ;) well dusted my 250 and did some hovering for about 3 packs....am using an old spare main gear so theres a significant wobble coz of some previous crash still waiting for new ones to come...some delay due to xmas i guess.... >:(...noticed a very minimal wag...! not bad but does keep bothering...otherwise the li'l devil responded well to controls...was hovering in some breeze so was a good practice...luckily no crashes ;)...is that wag coz of the main gear wobble...?
Should we summarize that 250 is not a beginners heli? :headscratch:
I never thought they would cauze so much issues, especially being an Align original and all original components.
Quote from: vinay on December 24, 2010, 09:22:31 PM
Should we summarize that 250 is not a beginners heli? :headscratch:
I never thought they would cauze so much issues, especially being an Align original and all original components.
if u ask me 100% right
i would say best beginner heli is t-rex 550 or gaui x5 or similar stability and good hang time make the crash frequency down, even atom hv6 even do it is using 12s but it is light so 2 6s 3300mha is ok for long fly time
electric rules ;o)
true guys...250s are not for beginners....but had already bought it before i realised that...and fault maybe on my side also...i may be overlooking some issues here...probably will get better over a period of time...but havent regretted buying this one....will get into 450 or 500 size helis in 8 months or so...till then just gonna hang in there...!
Hmm... I am ASSUMING it would not be all that bad if the beginner spent quite some time on the sim AND the cyclics are toned down with expo and/or DR :headscratch:
hi guys hope u all have been having a rocking new year so far!....my 250 wag is fixed and has been flying great for about 8 packs of hovering and little bit of forward flight... re-adjusted the servo on the mounts in such a way that there is absolutely no bend in the control rod...and i reduced my end-points on the rudder channel to 100...previously 110...wag is fixed( about 95%) occasional mild side wards swing is seen but not significant....maybe when i get a quark i might have a solid tail ....meanwhile i have a question...i have tucked in the esc and motor wires within the main frame and the gyro and servo wires too! the motor/esc wires are almost touching the gyro and its wires from the inside....can this be causing some interference in the gyro performance?....need some help soon guys!!
thank you
rgds
It is definitely advisable to keep the gyro away from interference as possible especially the ESC/MOTOR and some say even keep it a lil away from RX!
I have kept the ESC outside, as it also helps with with cooling also a bit. Chances for it get damaged are quite remote, and it is always better to keep the higher voltage stuff away from the lower voltage stuff.
BTW, reducing the endpoints on the rudder channel only reduces the piro rate (and tames the response of the rudder input), it should not have impact on any wag by itself (unless the wag is induced by your shaky fingers :)
I also got a 250, yet to be built ! :)
that's cool anwarbhai! welcome to the 250 gang... {:)} :thumbsup: its one amazing li'l devil! n trust me you'll have a blast flying it around! oops i guess you already know that! just a li'l excited you got one! let us know your progress and the set up!
and ya will setup the esc and the motor wires away from the gyro and will let you know the progress!!
thank you so much
cheers