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Old Feb 01, 2013, 03:49 PM
1400 watt RW Zephyr
matwelli's Avatar
Taranaki New Zealand
Joined Sep 2003
1,337 Posts
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VTOL bi-copter experiment

Based on some prior playing around with bicopters and thrust tilt platforms ( https://www.youtube.com/user/matwelli ) thought it was time to get serious about VTOL

for me, forward flight isnt the GOAL of this, its just part of the package, this airframe needs to be effective both hovering and forward flight, i look at forward flight as being a range-extender , with hovering to do real work being just as important

I have two designs, a quad based, and this, a bicopter

in hovering, it uses motor speed diferential for pitch control, it also tilts the motors slightly, this has no effect

uses motor side/side tilt for roll and yaw

to transition, the front/rear motors tilt to 90 deg, the yaw still works by tilting the front rear motors.
pitch control is controlled both by elevons on the wing, and by pitching the front/rear motors
roll control is by the elevons on the wing, and by the motor roll control, as they are above the CG they will still be effective

this is the maiden flight - the foam wing is for show that part is a while away from being sorted

downfall of this design, is as with all bicopters, effectiveness of roll control depends on the vertical diference between the CG and the motor pivot point, and with this frame its only 50-60mm , and changing the load will affect the control and PID tuning requirements - so my quadcopter design (next to be built) may be a better overall choice

VTOL Bicopter Maiden (2 min 13 sec)
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Old Feb 01, 2013, 05:31 PM
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Actually, there's a way to control roll effectively that would not depend on the distance between the rotor til point and the CG: If the rotor had a swashplate and cyclic input. This is the way the V22 can manage to control pitch in an hover while still managing a decent allowable CG range. It is a cargo plane, after all.
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Old Feb 01, 2013, 06:00 PM
1400 watt RW Zephyr
matwelli's Avatar
Taranaki New Zealand
Joined Sep 2003
1,337 Posts
are you talking vertical or lateral CG ? i can see it helping with a lateral CG change

the osprey (real machine not rc) is a very cleaver machine, but i am just using off the shelf motors and props, two fully functioning helicopter heads would be cool, but not what i am doing
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Old Feb 02, 2013, 05:29 AM
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Quote:
Originally Posted by matwelli View Post
are you talking vertical or lateral CG ? i can see it helping with a lateral CG change

the osprey (real machine not rc) is a very cleaver machine, but i am just using off the shelf motors and props, two fully functioning helicopter heads would be cool, but not what i am doing
Hi matwelli,
what board you use for stabilizations!?
Regards....
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Old Feb 02, 2013, 09:44 AM
Winging it >
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Joined May 2006
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Nice work mate! Looking forward to seeing where you take this project!
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Old Feb 02, 2013, 03:19 PM
1400 watt RW Zephyr
matwelli's Avatar
Taranaki New Zealand
Joined Sep 2003
1,337 Posts
@Nadine - its an open pilot copter control board, I love using them because you can easily access the custom mixer to do some wild setups I have the tilt forward servos controlled by both pitch and an auxiliary channel mixed together

@lead feather - cheers, its certainly been an interesting experiment
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Old Feb 02, 2013, 06:42 PM
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United States, IN, Granger
Joined Jan 2003
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Cool and simple ,, looking forward to what you do with this contraption and I say that with respect as it is the same type of test rig I usually use to prove an idea
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Old Feb 03, 2013, 11:59 AM
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Powell TN
Joined Jan 2008
735 Posts
very cool Matt...You are a talented individual...

Terry
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Old Feb 18, 2013, 02:40 AM
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Arkhangelsk, Russia
Joined Apr 2009
40 Posts
Hello all.
I want to present my bi-copter from the game Halo.

Falcon UH-144 HALO RC model bicopter (2 min 24 sec)
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Old Feb 18, 2013, 05:43 AM
vtol fan
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Quote:
Originally Posted by native18 View Post
Hello all.
I want to present my bi-copter from the game Halo.

http://www.youtube.com/watch?v=V-DZXIj4RPk
OMG
Superb....
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Last edited by nadine; Feb 18, 2013 at 09:22 AM.
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Old Feb 18, 2013, 04:18 PM
Will fly for food
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United States, CA, Carlsbad
Joined May 2011
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Quote:
Originally Posted by native18 View Post
Hello all.
I want to present my bi-copter from the game Halo.

http://www.youtube.com/watch?v=V-DZXIj4RPk
Well done, sir.
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Old Feb 18, 2013, 04:28 PM
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Quote:
Originally Posted by native18 View Post
Hello all.
I want to present my bi-copter from the game Halo.

http://www.youtube.com/watch?v=V-DZXIj4RPk
In my opinion, you are the coolest russian i have seen on YouTube (after fpsrussia ). Great bicopter. Does it hover stable?

Greets from around the border.
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Old Feb 23, 2013, 08:49 PM
1400 watt RW Zephyr
matwelli's Avatar
Taranaki New Zealand
Joined Sep 2003
1,337 Posts
wow - nicely done.
you should do a thread on it, size, CG location, settings, she certainly flies nice
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Old Feb 24, 2013, 03:31 AM
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Quote:
Originally Posted by matwelli View Post
wow - nicely done.
you should do a thread on it, size, CG location, settings, she certainly flies nice
CG location is below the axis of rotation of rotors.
55cm length of the model
Weight 620g
screws 9x4x3
flight controller MultiWii Lite v1.0 (Bi)
motors - D2822/14 1450KV
battery 2S 3000
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Old Feb 24, 2013, 11:35 AM
vtol fan
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Joined Jul 2009
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Quote:
Originally Posted by native18 View Post
CG location is below the axis of rotation of rotors.
55cm length of the model
Weight 620g
screws 9x4x3
flight controller MultiWii Lite v1.0 (Bi)
motors - D2822/14 1450KV
battery 2S 3000
You could post,pid settings for the craft!?
What servos you use it!?
regards
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