Homebuilt Coaxial Helicopter (RELOADED)
- Thread starter quadrirotor
- Start date
quadrirotor
André MARTIN
- Joined
- Oct 30, 2003
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- 1,794
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- Québec, Canada
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- airplane, trike, gyro, paramotor...
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what do you mean by "status"?
quadrirotor
André MARTIN
- Joined
- Oct 30, 2003
- Messages
- 1,794
- Location
- Québec, Canada
- Aircraft
- airplane, trike, gyro, paramotor...
- Total Flight Time
- 350
you can contribute! Go on!
gwellbeing
Newbie
DIY coaxial homemade helicopter project from China
hillberg
Active Member
yaw will suffer control reversal in autorotation - other then that it look good
Yaw drag flaps on the tips will do nicely (QH 50 style)
Yaw drag flaps on the tips will do nicely (QH 50 style)
okikuma
Member
Yes, drag flaps would work nicely IF there's a differential. I suspect that is not in this case because of the chosen method of yaw control. Searching the net, I see most amateur coax designer/builders use this method for equalized counter-rotation.
I can't get over how small the diameter is for both rotors.
Wayne
I can't get over how small the diameter is for both rotors.
Wayne
Last edited:
hillberg
Active Member
Yaw flaps will always work. the gearing of a coaxel is not a limiting design feature nor a dynamic or static mas, if you put a fixed set of flaps above and a movable set on the lower blades.
what you show is powered lift with very high disk loading and two rotors way way too close to each other......
what you show is powered lift with very high disk loading and two rotors way way too close to each other......
okikuma
Member
Yes, but I was just using this video to quickly show the simple method of creating counter-rotation with a single power source.
Wayne
Wayne
Jake2465
Newbie
This thread is so many pages long that I am having a hard time understanding its overall purpose. Was it to see about getting a coaxial helicopter built?
hillberg
Active Member
THOSE WERE TEST SUBJECTS ONLY NO PRODUCTION
Cicare had his designs taken, He's a great designer.
As for the coaxal stuff they mostlyall use standard collective & cyclic controls - Yaw is reversed unless a special null cam is used or tip break servos.
Fixed pitch with mast tilting in the cheaper 'kits' are falling bowling balls with a seat when the engine stops.
All a coax does is add to the costs of extra main rotor blades - controls & headaches - The standard single main & tail systems do better.
I'll take a tandem Chinook over a Kamov coax any day. and a standard Hughes twice on the Weekend.