Homebuilt Coaxial Helicopter (RELOADED)

[thjakits]

So - what's the status on the Coax-helicopters here?

 

[quadrirotor]

what do you mean by "status"?

 

[thjakits]

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?

 

[quadrirotor]

you can contribute! Go on!

 

[thjakits]

Well - I guess it went the way I think it goes - Coaxial is pretty much a dead end for homebuilts....

 

[gwellbeing]

DIY coaxial homemade helicopter project from China

 

[hillberg]

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]

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

 

[hillberg]

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......

 

[okikuma]

Yes, but I was just using this video to quickly show the simple method of creating counter-rotation with a single power source.

Wayne