Hafner AR III 1:5 (6) - Page 2 - RC Groups
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Oct 01, 2017, 03:49 AM
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If they would be selling them as sets of blades, I surely would be complaining. But as it is, they sell them just as balsa profiles, I think for simple gliders or suchlike.
So it was just a test if the profiles can be used for blades. I am still hopeful. Will keep you updated.
Last edited by wernersen; Oct 01, 2017 at 07:02 AM.
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Oct 01, 2017, 01:57 PM
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Do you know http://www.ebay.de/itm/Rotorblatter-...YAAOSwWxNYtH07

I have no experience with these blades. But they are delivered from Germany and they are dedicated to autogyros. I think, the price might allow a try. And you can contact the manufacturer directly for a special design.
Oct 01, 2017, 10:21 PM
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britinoz's Avatar
Well ..it doe's appear as if they are being sold as autogyro blades an as such, I would have presumed that they should have a hardwood L/E???
I know that the ones made by Mike Smith in the US were that way an I believe that the Coolwind were also . All the blades that make have a 5 X 5 mm square pine L/E.
Oct 02, 2017, 07:20 AM
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Ralf, thanks for the tip, worth having a look and price is Ok. But I do need some kind of hard leading edge for durability and balancing. pure balsa will have a CG at around 45%, but I would like to have it somewere between 25% -30% for stable flight assuming rotors work just like wings.
The other problem is that 2 inch seems a bit narrow for the planned rotor size. Would surely look scale but I am still afraid of running in to problems (torsion stability). I dont want to imply that these blades cant work on smaller autogyros as advertised.
I think I can work with what I have.
My balsa profils have the CG now at about 35mm from nose weighing in at 58g. If I add a 2,5mm steel nose weighing 38g, CG would move to 21mm from nose or 28% of the profile. Estimated total weight would be 100-130g per blade. Comments welcome!

Anybody thinks steel to dangerous as leading edge?
Last edited by wernersen; Oct 02, 2017 at 07:25 AM.
Oct 03, 2017, 03:56 AM
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britinoz's Avatar
All the Autogyros of Arizona kits had a 1/8" K&S wire leading edge.
Oct 03, 2017, 11:20 AM
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Ricardo1500's Avatar
My Kelletprofile blades had piano wire leading edges as per the Plan and they worked fine.
Oct 03, 2017, 01:16 PM
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Thank you for this info, gives me confidence in my plans
Built a 2 cm test part off the blade profile.
First grooved the blunt leading edge with the sharp end of the piano wire. Then glued the piano wire to the groove. CG moved to about 19mm from LE.
Sanded LE smooth and the lower side of the TE up to get a sharp TE and the profile towards Cm neutrality.
Laminated 125mil lamination film once around the profile.
This moved the CG to about 22mm.
Weight so far is about 1g per cm.
Oct 03, 2017, 04:05 PM
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PaulB's Avatar
Just ordered a set for my poorly Burky, was looking for these blades but searched for Autogyro, Auto Gyro and Tragschrauber but didn't think of 'RC-Gyrokopter'......... ().

The Guy has posted to let him know what you need and he has had blades with hardwood leading edges.

Man kann auch Schleifpapier und ein Balsahobel kaufen

Oct 07, 2017, 10:47 AM
Registered User
Built myself a little tool to constantly groove the nose of the balsa profiles before glueing the piano wire.
Oct 08, 2017, 05:35 PM
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britinoz's Avatar
Nice thinking..........
Oct 16, 2017, 07:05 AM
jodini's Avatar
Looking good!
Oct 27, 2017, 08:34 PM
The 1st Sofaman
Sofaman NJ's Avatar
Impressive work. I have loved this particular autogyro, glad your are modeling her.

Please....add down thrust on your motor. 6 degrees is the norm. One of your first raster pics shows the radial pointing pointing down and your Cad drawing over the raster image seems to be 90 degrees.

The new gyro designing going on, seem to have forgotten the down thrust. It is important. Not trying to say you are wrong. But please take my advice and and try it vs. the straight design. Let you see which you like better.

Hope this advice may help.

I am so excited to seeing you guys making autogyros!!!


PS.....your little jig you made to groove the leading edge wire is awesome! I am going to build one myself, thanks for the idea.
Last edited by Sofaman NJ; Oct 27, 2017 at 08:38 PM. Reason: Forgot to add some info

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