Tail wag and head speed-trex 500 FBL

Started by Ajay JM, January 29, 2011, 10:57:57 PM

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clayboy

i have limited Internet now so I can not c your video but is the wag bad? or just a slight movement?
can u do a funnel or do backward flying.
I guess it is still a vibe problem. have u tried new tail blades?

or get a mini with pro update and use the event log and spectrum analyzer
or a full size and use the gov witch is the best on the Market  and use a flat throttle curve

talking about gov u don't have the governer activated in the esc? that will give u wag for sure
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Ajay JM

QuoteHave you seen the pictures of some of them with the mod, they have shoved in quite a bit of hotglue/silicone !

Looking out for some Zeal, Anwar.

Btw, I just squished in a rolled square piece of BeastX ad tape in between the 3 sensors and guess there's a minor difference in tail wag. Need to ensure that today though, by putting in some more. I used such tape since I can easily remove it. If this improves the tail even a slight bit, I would consider the hot glue mod.


@Clayboy: The wag is slight, only noticeable in hover. Can't take it outside now, since it's freezing here. Did short and slow backward flights and pitch pumps indoor, don't see wag. Had the stock align CF blades on first. Wag was there. No matter howsoever small, I just don't wanna live with the wag :'(. I would rather get a dog  ;D

Also, the tail kicks in fast left or right at least once within 5 flights

No, I'm in the soft start with no gov mode on the align ESC.

Yes, mebbe a mini V in the flights to come once I get richer :thumbsup:
Awaiting the next tornado to fly my kites..

clayboy

ok. i am not familiar with 3g and its behaviour , i have only flow v-bar the last 4 years ;D

but i guess it is vibe related, maybe a bad sensor that is over sensetive? or just to much vibes ?

and dont use beastx tape, it is pretty crap, futabas tape or v-bar or spartan tape work the best, atleast on v-bar

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Ajay JM

#28
Finally, I get to say; Phew!

It's snowing here and roads appear rather skateworthy. Sitting at home and utlising my leave by putting in constructive RC hours I would say.

Smalltalk aside, the tail wag is 98% gone as of now. I packed the 3g sensor unit with more of the BeastX pad pieces quite tight and so far've done 3 hovers after that. The wag is as good as gone now. Yet to notice any tail kicks either(though it maybe a bit early to judge that). Certain that it is the bulls eye that we've hit, I will go ahead and replace the BeastX with hot glue sooner or later. Maybe that will lock the tail in solid. Anyhow, I am happy with how it holds now so much so that I might even give the glue idea a pass.


Time to thank Anwar, Clayboy and Sujju for tips and suggestions that led to this result.

Here's a video..



Will post with further updates on whether tail kicks also stand eliminated after a few more flights.
Awaiting the next tornado to fly my kites..

Ajay JM

Hmm, once tail kicked right. That's wrong :(

Watch out at 00:08. I got scared a bit and landed like chicken that fancied flying  ;D



Gotta feed some glue to the sensors it seems!
Awaiting the next tornado to fly my kites..

Ajay JM

Okay done with the hot glue mod. I don't see any improvement over using the BeastX pad stuffing inside. The minor wag that can be ignored is still there.
I'm using Gyro->Spartan thin foam->Spartan metal plate->Spartan thick foam combination in that same order as was before.

What I am not happy is that the tail still kicks once in a blue moon, and blue moons appear more frequently than it should have :'(

Btw, just bot a canomod phantom air brush canopy and fusuno stabilisers for better aesthetics. Hopefully the align gyro falls for the looks and will start behaving  :P
Posting a pic..
Awaiting the next tornado to fly my kites..

anwar

Hangar : Please see my introduction.
RC India forum and me : About this forum.

iamahuman

I see a car and its radio in the background.The car seems like an on-roader.What are they?
"Chuck Norris once overcharged a lipo. Thank him for the Sun."

SSC LCG Slash 4x4.
JQ THE eCar.

Ajay JM

#33
QuoteRed "hot" !
Thanks Anwar Sir :).
Red makes it more visible high up in the air as well I guess.
Need to use a hot blower on one side of the canopy though to expand it a bit and that should stop it from touching the main gear.

@iamahuman:

That's my nissan 350z drifter, have put a video and pics of that in the cars section..
http://www.rcindia.org/cars/post-your-car-pics/msg46232/#msg46232

Just have one for fun..not too much into cars :)
Btw, recently bot a scale 1/10 HPI nissan gtr r35 black n white shell with light buckets installed for this. Haven't posted a pic though 'cos I rather felt like an alien myself in the cars forum :'(.
Awaiting the next tornado to fly my kites..

iamahuman

Hey,no need to feel like an alien.You have to start out.Now that I go back and see my first few posts,I feel like a douche.
"Chuck Norris once overcharged a lipo. Thank him for the Sun."

SSC LCG Slash 4x4.
JQ THE eCar.

Ajay JM

#35
So here's the new problem after the hot glue mod. I have ascertained that my swash is perfectly level at mid stick, but the heli has a tendency to go backwards unless I give forward elevator. I even tried overtrimming the elevator so that it leans forward a bit at midstick.
Howsoever Heli wants to fly reverse with a sinking tail.

Thoughts racing in mind that may not sound logical

1. Fiddle with elevator gain
2. Glue disturbed the perpendicularity of sensors in the 3g unit
3. The few grams of hot glue in the sensor disturbed CG, added little bit of weight towards the rear trying to sink the tail down in flight.

Suggestions please..

PS: I have put my disclaimer underlined and in bold. So you can't tease me for that  ;D

Awaiting the next tornado to fly my kites..

Ajay JM

Interestingly after the glue mod, I guess the heli's rear has gained a bit of weight. I held the heli by the main rotor head and it is leaning slightly backward now, whereas before the mod, it hung horizontal.

Sounds unbelievable to me, but can a bit of hot glue create much weight difference? Also the sensor is mounted near the CG if not at it.
Read about lots of people doing this mod, but none complained of something like this.

Am I missing something here?

Guess I should've stuck to the BeastX stuffing :(

Now, if there's a way out, it's probably out of 3g.

Wish someone gifted me an MB or a MiniV on my neighbour's birthday which is tomorrow ;D

Btw, does anyone hold the record of receiving gifts on President's day or is it just the President?
Awaiting the next tornado to fly my kites..

clayboy

#37
unless u used the most heavy glue ever made i can garantie it is all the bling u just added, move the batterie slightly
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Logo400

#38
Quote from: Ajay JM on February 16, 2011, 08:16:01 AM
The minor wag that can be ignored is still there.

Hi there, ok, I flew for quite longer the 500 with 3G FBL.I wanted to sell it after a month as I was desperate in solving the tail wag.But I did not gave up and finally I won!
I did not discover the hot water but the main source for wags are vibrations.Let's say that is a combinations of multiple things but a good 60% is vibrations.
On my 500 I was using a layer of spartan gyro pad, metal plate than thin white spartan foam.On top of that I secured the sensor with some velcro strap.Check the belt tension, need to be quite stiff.HS:run a good 70%throttle.Very important, the smoothness of the tail pitch assembly on the tail shaft.Did you do properly the limit on the unit?
Since I solved the wag I loved the heli and I can tell you that it flew amazing!
Let me know if you need any help!

Chris

sujju

chris... welcome to rcindia man...  :).. good to see you here too... 
CEO
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Logo400

Ahhhh Doctor!! I always told you that one day we will fly together in India...and of course, free spares right?? :-))

Chris

Ajay JM

@Chris: I use the same spartan padding for the gyro in the same order. Also, my 500 is a TT, not tail driven

I am okay with ignoring the very slight wag that's there, but heli is acting a bit tail heavy now after everything(moved the battery also a bit forward). Haven't been getting a lot of time recently to take a closer look at what's wrong. Need time for further investigation.

Btw, I'm not sure it's exactly tail heavy either. On reverse elevator, the heli pulls back quite faster than it moves forward(though the swash is level at midstick).When I hold it up by hand in the air by the head unit, it slightly leans back as well making me assume tail is heavy.
Awaiting the next tornado to fly my kites..