RC India

A humble attempt to SPAD the quad :) Still working on it. 4mm coro triangular tubes and 6mm flat plates so far.

What is the reinforcement inside the arms, if any ?

Looks nice. Someone made a depron quad on rcg but it was ducted, so he could hit it against a wall and it would come back.
Yours looks very neat. :salute:

Good question Anwar bhai :) One of the tube is full length (24") and the other one is two halves joined at the center to the (or through the) other tube. The tubes by themselves are strong enough. But the halves needs additional reinforcement at the center. I have used bamboo skewers and epoxy in the middle for this. Seems ok and once I add another flat piece on the bottom, it should hold :) Legs and a top cover is also planned hopefully with coro or else foam.

Thanks hyd_quads, its still half done but only took an hour or so to get to this far. Shouldn't take much time to finish though this is my first attempt at quads or copters. I have the corotwist to finish, so struggling to find time after work (plus a training session after office) :(

Some progress! slowly taking shape :)

 {:)} {:)} another great and neat build from spadmaster.... spadtothesam ......

Whats the prop size of the motors...

Thanks amit! That was soo kind of you :D though these are nothing compared to real masters (like Izmail etc....) The props are 8x4.

That is a mean looking machine. IMHO,some true innovation after a long time. Please detail a bit about the reinforcements used, with pictures, if possible.

Regards.

Great build. Something innovative. Triangular shaped frame adds more strength.

Thanks for the kind words VC and Dharmik :)

The booms are 24" 4mm triangular tubes and the center pieces are 4"x4" 6mm (4mm might do) squares. About the center joiner: One tube is 24" long while the other one is two pieces glued (Medium CA) to the flat pieces and bamboo skewers are inserted between them thorough the straight piece for additional strength using clear epoxy. Once the bottom flat piece is epoxied, its rock solid. Later I might use some black small cable ties to secure all these together since the weight of the battery is supposed to hang from the bottom flat piece. I am really sorry that I did not take a close up of the middle section before closing it with bottom piece :( But if you need me to explain it more, will be more than happy to... but one of the pics I posted (before the paint job, on the wall) shows the bottom with out the flat piece) I wanted this to be an easy to make coro frame. I think there could be tens of variations of this. My only concern is weight. I have no clue how much these should weigh :(

The frame with motors weighs 315gm now. Being new to quads, I dont know how that compares to other builds. Each motor is close to 200W capable, so hoping that will be enough. The expected AUW is 600gm or less. Still a landing gear and top cover to be built. I am going back and forth between this and the Twist :D to finish both within this week.

amazing build :salute: :hatsoff: :thumbsup: {:)}

Thanks manu :) hope it flies equally good ;)

I just tested by quad setup with emax 2822, HK SS 25/30 esc, HK KK v3 board and a 2200mah 3S. Every thing seems ok except one motor  :banghead: All ESCs are calibrated and all other motors works as it should be. This one (M1) starts late and stops soon if the control sticks are moved !!! And wont restart until you cut the throttle and power up again. That makes it not flyable and didn't try to lift off :( And by the way, the motor itself seems a bit tight if you try to rotate it by hand compared to other motors.

Any one faced this problem? Any help is appreciated :( am I missing any configuration?

EDIT

hi sam you have to do a step called stick centering from the kk v3 board have a look at this video it shows you how to do it


note stick centering from 07: you might as well just skip to that


www.youtube.com/watch?v=c9MNRT19yp4


Subbu

Wow Pikle6, that was quick and yes I missed that. I have seen that video but was following this one http://www.youtube.com/watch?v=B6m49Cw3OFU while I was setting it up . Thanks a lot buddy :) Will try this out tonight and lets hope it fixes my problem.

thanks for your video now i had not seen that one.

i guess we should have a multirotor lover option too in the forum profile  ;D

Subbu

just finishing up the electronics on the v22 osprey

Most welcome :) And looking forward to see the Osprey in action!

Stick centering is firware based feature and not hardware base. As long as i know strick centering is not available in stock and kk firmwares. It's probably trim and fly firmwares. As i know stick is only available in mark's xx firmware and it requires lcd.

Dharmik, I think the flitetest video is showing the 4.7ver for X config and they are able to do the stick centering procedure on the KK board. But whether that is available on the stock firmware is another thing. Will try it and find out tonight.

You should try that bro but if you watch video from 1:00 you will see that the firmware they have flashed has motor order CLOCKWISE.
M1  M2
M4  M3
While kk 4.7x firmware has
M1  M3
M2  M4
http://www.rcgroups.com/forums/showpost.php?p=18609175&postcount=73
While stock firmware plus config has
  M1
M2  M3
  M4
You have throttle range issue. You might want to know that hk ss series escs are not good for multirotor application, they don't have separate function for throttle range and it comes with limited(brake, lipo, ni-mh) functions. Many users having problems with motor sync however some of them were able to set throttle range.

Hmm.. I get your point. I also read some where that the SS is having problem especially with 4.7ver. But by that time I have already ordered them :( And the funny thing is that all the other 3 motors are spooling up properly and evenly !!!

intresting!

I tried to trim (elev) it out and it worked. Had to trim it all the way down on the up trim. Tried lifting off and couldnt maintain a steady hover within the small room. Will have to take her out somewhere later and try again. Motor1 which was having the problem seems to over heat compared to the other motors.

 :thumbsup: Nice to see a quad from Coro!! :o

Thanks guru :)

the motor issue seems to be solved and test run the setup today again.

www.youtube.com/watch?v=XBY-zDk0CHg&feature=channel&list=UL

Sorry about the crappy video as well as the crappy piloting. I am totally new to quads and helis :( When I tried the quad on Pheonix sim, it was so easy and it felt like flying a coaxial heli. But when I tried the actual thing....

nice.

Hi Sam. Those look like temporary landing gear? It seems to have moved around? When that happens, you will have booms at different heights from the ground. As per the HK controller manual, the caliberation on the board, is done "just" as the quad lifts off. So, an uneven quad will assume that the unevenness is actually level flight. Which could result in what seems like random yaw/pitch/roll at takeoff.

You will find that it is a lot easier to fly the HK board equipped quad. Also try landing it like a plane. I am a beginner to RC. I could not get my quad to "hover" or land softly. Was using the 2822 motors with 8 inch propellors.

Thanks codebanna!

subhashr, thanks and you have a point there :) the temp landing gear was not stable. As usual I just wanted to see the thing fly :D . Will fix the LG and try again.

awesome!!!!!

Thanks Yogesh!!! appreciate it :) once its flown outdoor, will modify or beautify a bit ;)

well even im in the same position as yours .. plannin to test it outdoors today evening :D hope it flies .. have never flown an rc plane/ heli before .. guess its gonna be difficult for me

do you have any more videos ?? and whats the specification of your quad ??

My setup:

Motor:    FC 28-22 Brushless Outrunner 1200kv
Prop  :  8x4 slowfly
Esc   :  HK 25/30A SS
Bat   :  Turnigy 3S 2200 20C ( I might use one more parallel to increase both the flight time as well as to help the C rate)
FC    :  HK KK v3 + config
Frame: Own design Coro build 24" motor to motor

I tried hovering it inside the room once more after tweaking the gyros a bit more and was able to get it like 2 to 3 feet high with out damaging the things around the room :D Seems ok for outdoor. Will post more videos later.

Just completed an year into RC, but a complete novice when it comes to helis and multi rotors. I think it shouldn't be a problem for you once you dial the right amount of gyro because it is supposed to auto stabilize (well to a certain level :) hopefully).     

Just received the AVR programmer! What could be the best X-config FW for my setup? Please help with suggestions!

well you can always opt for (X) confg - controlling the quad with Xconfg is easy. Is your frame stable ?? is the motor-motor distance is same for all the 4 arms ?? if there is any slight deviation in arms, X-confg can take care of it .

The frame is stable and I had Xconfig in mind when I built it. Now the question is to find the best FW for flashing. I got a suggestion from spadworld by TFF to use minsoo X config. Still waiting if any one else has a better FW to suggest to.

Coro quad frame is a brilliant idea {:)}
how did you fix your motors on the frame? zip-ties ???

Thanks SunLikeStar! a small piece of lite ply is epoxied to the frame. And motor is attached using small wood screws. And once she is finished, you would not see any cables or wires except the power cables :D

Super! Yes the wires and esc can go inside the tube :thumbsup:

:D thanks! I have managed to secure the escs under the flat plates. Only the extension wires are required to be routed through the tubes. The extension wires are soldered at the esc end and bullet connectors are used at the motor side for easy access and repairs. Once flown outdoors, then I will proceed to build a top cover and a proper LG. Thanks again for the encouragement !

Having trouble with the KK flash tool :( avrdude is not dong any thing when tried to run (Windows 7 32bit Enterprise edition). Will have to try on XP at home. In the mean time helping hands are most welcome :D

hey sam is the problem with the flashtool not opening? or not working? if not working try to diagnose the problems with the usbasp programming device -

did you correctly install the win7 drivers for the usbasp programming tool and is it showing up in devices and printers. i had a similar problem where device was not recognised i changed the usb port and it worked.

kkflashtool works perfectly fine on my win7 professional edition

refer this for more info

Subbu

Thanks Pikle6, I didnt connect or install the drivers. Thought the sw will open without it! Just wanted to see the options available :)

H Copter version by flitetest

http://www.youtube.com/watch?v=nJWwXA5cHJc&feature=em-uploademail

Definitely SPADable and I am going for it :D

Maiden Video :)

http://www.youtube.com/watch?v=UINCS5GX6Ww

Presenting the correHcopter :D

Built last night and maidened today early morning (you guessed it right, no sleep  :banghead: as usual) . Will add some color and probably to aid with orientation, a tail.

Videos:


http://www.youtube.com/watch?v=kaYBR1gaRl4&feature=plcp (maiden)


http://www.youtube.com/watch?v=O4EDcT1lMnY&feature=plcp

Wow Sam! Is it really that easy? Or are you making is SEEM easy to encourage us? :salute:

Thanks a lot VC, I am very new to heli's and quads. I struggled last time with the correXcopter, but this time it was soooo easy!!! Felt soo good too :D Didn't sleep, built it over night, fasting and drove 45km early morning and maidened alone. Couldn't be happier with the results except the crash (orientation issue, I applied wrong elevator input). Now I will go and try to get some shut eye  :giggle:

That personifies passion. Go sleep Lad.

Nice build samlikespad :goodjob:
Can you please post some close up pictures :)

Thanks VC and Sunlikestar :)

Some pics. Will upload more once its painted fully.

Beautiful, thank you for posting pictures! Any reinforcement inside the coro tube?

No, 4mm coro flutes lengthwise. Once you fold it into a tube, its rock solid. No flex.

The protruding nose could be a future cam/fpv platform and the fuse could take any shape ;) . Original plan was to make it purely SPAD with coro booms, but wanted to finish her in one night and cheated with the wood parts. Infact, the plan was to have the booms go through the fuse at half height. That way the looks would have been different :)

:)

http://www.youtube.com/watch?v=NQgS0wDkOos&feature=youtu.be

Dont know whether it was pilot error  :giggle: or the dying battery :(

Sam
Neither! i watched your video carefully and had predicted this behaviour of your quad to sandy couple of days ago. The reasons are
(a) Yours is a rectangular frame, unlike a square frame a rectangular frame has a few funny cross coupling issues

(b) Roll yaw input will translate to pitch behaviour as well (Pitch up and down)

(d) Pitch authority will be more than the roll authority because of differential moment arms.

(c) All motors will not have the same authority for various movements (roll pitch and yaw) because of variable moment arms

(d) Boards do not cater for such an arrangement, though by keeping it docile you can fly around, but it will have cross coupling issues always.

Rectangular frame? a lot of them have made, as i see on the net , but i don't see anyone really able to see the issue.

For your consideration Sam ! ;D

Gusty bhai, thanks a lot for finding time to review my video  :hatsoff: which was informational.

Now, about the frame. It appears to be rectangle (one side longer), but the distance between motor to motor are the same on all sides (18") which makes it square. I made sure that since I was not sure about the longer fused quads especially me being first time on quads/helis. But I dont know whether the shape (square coro and the sticks) of my frame is anyway related to this  :o And I am not challenging your valuable input, Just wanted to know more   ;D

I checked the battery after the crash and it was 11.0v. I guess it was mostly a pilot error. There is reason to believe so since as usual I was there without sleeping (Eid celebrations)  :giggle: . Had couple of flights without any incidents, then flew the twist and before leaving wanted to fly the quad again. Tired and sleep deprived, I guess I lost orientation  :banghead: .

If you had flown in a X configuration with C/C of Motors and diagonals exactly equal then it should not affect you, but a Plus configuration in this frame is unpredictable due to cross coupling.

Thanks Sandy, my first quad was X config. I stripped it down to build this Hconfig when I saw the clip by flitetest. Built it exactly the same but with the H fuse. So I guess coupling doesn't affect this one.

from the quad board to motor (roughly) if it is same then yeah ! you are right shouldn't have an issue except that force translation from the motor to the frame is through an 'L' frame for cross controls and straight for roll and pitch. if you see Flitetest video carefully the same thing has happened before landing, it could be finger trouble who knows ? all in all it is not completely attributed to pilot error and partying, ;D
http://www.youtube.com/watch?v=nJWwXA5cHJc

Sandy and rest
look at the antennae setup for 900 Mhz which Josh Bixler is using, interesting clover leaf, glitch free

That's exactly the one I am fabricating for myself, a clover leaf and also a Skew Planar Wheel antenna. However the Range is less than a Inverted V and a Bi-quad antenna combination. However a CP antenna is supposed to be totally Glitch free within that range which is Quite good for an FPV flyer.

Quote from: rcpilotacro on August 21, 2012, 12:21:47 PM
from the quad board to motor (roughly) if it is same then yeah ! you are right shouldn't have an issue except that force translation from the motor to the frame is through an 'L' frame for cross controls and straight for roll and pitch. if you see Flitetest video carefully the same thing has happened before landing, it could be finger trouble who knows ? all in all it is not completely attributed to pilot error and partying, ;D

Gusty bhai, the board is roughly at the middle of the frame. And all the components are distributed evenly and hence the battery placed in the middle for CoG. The "L" effect is something I never thought about and was very informational. Thanks a lot for your kind directional corrections :D Will use this "H" for learning purpose and will move on to "X" once I feel comfy flying these bugs.

Josh Bixler and H Copter ! Have fun

http://www.youtube.com/watch?v=gh5zJQDKOSQ

Had some fun with the correHcopter today morning. Enjoyed every bit of it! Though it is in very bad condition after numerous crashes, still flies good.

http://www.youtube.com/watch?v=UngfL_ImefE&feature=youtu.be

Wow flies great. Which FC you are using now?

Thanks Dharmik. Slowly slowly am also becoming a heli/quad addict ;) am using HK v3 and Minsookim FW.

Congrats Sam. My Quad using the KK2 board is ready. I hope it flies as good as this.

Thanks VC :) If my piece of scrap plastic can fly at least this good, with the meticulous building style of yours it should fly on its own ;)