Homebuilt Coaxial Helicopter (RELOADED)

thjakits

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Mar 17, 2020
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Panama
There was a LOT of discussion going on here - and then it suddenly stopped - is there still a discussion or are we just the jokers here?
 

hillberg

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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)
 

okikuma

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May 21, 2006
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Santa Clarita, CA
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


 
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hillberg

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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......😧
 

Jake2465

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Apr 27, 2016
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Huber Heights
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project
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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

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Cicaré coaxial.

Cicaré coaxial.

Who knows what became those coaxial (Dennis Fetters, may be!?)???
And what are the intentions of Cicare about them???

http://www.cicare.com.ar/index.htm
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.
 
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