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Mar 14, 2005, 04:56 PM
dieselburner
andrew b's Avatar

Kestrel Autogyro


Has anyone built one of these models, a free plan from RCME in 2003 ?
If you have and it flys, would you be able to help me clear up some details which aren't clear on the plan or in the magazine article.
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Mar 14, 2005, 09:53 PM
AND FOR MY NEXT TRICK....!
jodini's Avatar
Have you checked out this........
http://www.autogyro.com/models/bishop/kestrel.htm
Mar 15, 2005, 03:34 PM
Registered User
That plan on ebay is an old controline plan. Interesting though.

Scientific had a 1/2A controline gyro years ago. Saw one fly at Florida gyro meet last year. Wing was pretty big so I am not sure if the blades contributed much lift or just went along for the ride. Fun to watch.
Mar 15, 2005, 03:45 PM
Registered User
Sorry guys,
My response above was intended for the "more autogyro video" thread.

About the Kestrel, it looks a lot like Dave Boddington's 'Gyrace' to me.
Mar 15, 2005, 03:55 PM
dieselburner
andrew b's Avatar
Thanks, Jodini, I read that article with interest and maybe it confirmed a suspiction

On the plan, the C of G is given as almost under the leading edge, while the text in the magazine article gives it as 1 3/4 inches back from the L.E, just about under the main spar! If he built his without the article and balanced it as per plan, it would be rather nose heavy and sluggish to respond

I have decided to modify the rotor bearings from those given in the plan by using model car bearings for the top bearing, and plain plastic car bearings for the lower set. I intend to power it with a PAW 35 diesel, as the fuel economy will be much greater thereby saving 3 or 4 ounces in the weight of the fuel. ( I like diesels)

The model as standard looks "bare" without a cowl, I will see how the motor sits on the mount before I can decide on the cowl, although the tail wheel as shown could be a good hidden counter balance the weight for the cowl
Mar 16, 2005, 09:01 AM
AND FOR MY NEXT TRICK....!
jodini's Avatar
You could just take an old 1/2a cox engine...take out the piston, off the back plate and bolt it down. An easy rotor head!
Mar 16, 2005, 12:28 PM
dieselburner
andrew b's Avatar
them little cox motors are worth money here in the UK , I'll stick with car bearings at 2.50 each (reckon thats still a rip-off)
Mar 16, 2005, 12:30 PM
dieselburner
andrew b's Avatar
I built a gyrace some years ago and it flew pretty well until the brass bush bearing siezed in flight and the rotor stopped
Mar 16, 2005, 12:34 PM
dieselburner
andrew b's Avatar
since then I have had the work/wife/children illness
Apr 15, 2005, 01:56 AM
dieselburner
andrew b's Avatar

a leap forward


Luck was on my side yesterday....I was driving past a closed down model shop yesterday, I spotted the owners clearing out thier stock and picked up 2 new in the box PAW 35 r/c motors including 7 tins of D1000 for 80
to follow on from that, I called in at the local bearing shop, who sold me 4 beautiful sealed stainless steel flanged instrument bearings as "obsolete" stock (4mm X 10 X 5). the rotors should rotate just by looking at them
Apr 17, 2005, 06:28 AM
dieselburner
andrew b's Avatar
ahhh, kicking myself over the bearings now, I pulled the spindle motor out of a dead hard drive and it has 2 beautiful sealed instrument bearings 5 X 13 X 4 mm
Feb 08, 2006, 03:01 PM
Registered User
How did the Kestrel end up AndrewB? One of my mates is about halfway through building one as well, but blown up to .46 size.
Feb 11, 2006, 06:14 PM
dieselburner
andrew b's Avatar
I haven't had chance to try it, my "flying field" (swamp?) floods during the winter and its been too cold. Hopefully will have a chance over the next few weeks.
Feb 11, 2006, 09:38 PM
Blew out my flip flop
David Hogue's Avatar
I have a used Kestrel here, I got at a swap meet recently. It was flown with a glow engine, but I intend to electrifly it. The previous owner told me to balance it at about the LE of the "wing" so that goes along with what you said about the cg earlier, Andrew. I am waiting for a motor to come in that should work pretty well on this...should be interesting if nothing else!!

David
Feb 12, 2006, 07:30 AM
dieselburner
andrew b's Avatar
Electrify My kestrel has a PAW 35 diesel swinging a 12 X 6 " master airscrew @ 8500 rpm on "straight" fuel.

I have a copy of the plans and the magazine article if you need them. The CG on the plan is 3/4" before the LE and mine wieghs in lightly at 3lb 8 oz.
Last edited by andrew b; Feb 12, 2006 at 07:48 AM.


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