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Cyril Carr Kestrel autogyro

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David perry 112/10/2010 17:38:58
932 forum posts
10 photos
Well Ive spent the afternoon cutting out the parts for a Kestrel gyro.  Ive decided to electrify this one, using the motor and ESC from a deceased PZ Me 109 I have lying around.  Well, my son does, but he aint here, tee hee.
I also have quite a few proper helicopter blades and might try to utilise these, we'll see.
Kevin Fairgrieve12/10/2010 17:45:22
1598 forum posts
2856 photos
I have one of these. OS35 MAX powered.
Flies nicely in the right conditions.
Looking forward to the build.

derek critcher 206/01/2011 13:52:53
34 forum posts
1 photos
Hi Kevin, you may have a little trouble with using copter blades as most are designed to
spin in one direction whereas the kestrel blades have to contra-rotate. Derek
David perry 106/01/2011 15:57:43
932 forum posts
10 photos
It was me with the blades.  Thanks for the info but my blades are 3D ones: symmetrical section.  However, we'll see!
Kevin Fairgrieve06/01/2011 16:34:21
1598 forum posts
2856 photos
Yep mine has the as designed by Cyril flat blades, that contra-rotate.
I did experiment with a 3 blade unit but did not put enough angle on the blades. Result, well it needee a little tlc afterwards.
All sorted now.
bees07/05/2018 22:22:23
108 forum posts

I am also building the Kestrel and was wondering how to determine the CG. the plan shows 1/34 from the leading edge but was wondering if you balance the Kestrel like a normal fixed wing.

Martin Harris07/05/2018 22:59:12
8870 forum posts
221 photos

I built one of these quite a few years back when it appeared in the magazine (as did a clubmate) and it flew very well - as long as it wasn't shedding blades. Did anyone else have problems with them? I tried various grades of balsa but never really cured the problem - although I do have some "proper" gyro blade stock which I bought to try and never got around to.


It was quite amusing to see the blades stop in flight sufficient airspeed, mine would come to a halt and the model would be flying on the tiny stub wings that support the blade hubs!

IIRC, the main requirement of the C of G was that the nose should drop if the model was supported from the blade hubs.

Fatscoleymo08/05/2018 19:18:16
247 forum posts
86 photos

I built one earlier this year, electric setup.

Fly's well, and is certainly different in the air.

The cg on mine is just behind the rotor masts, slight nose down attitude.

Needs a touch of power on the flair just before contact to halt the rate of descent...

It's fun..


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