I found this image of an tandem autogyro in the net.
Has any one informations about this type of autogyros or are there even some builders out there?
I read that an article in MAN had appeared in 1977:
G. Miller, The flying Banana Birotor.
Can any one send me a copy of this article?

Steve

Plans with article reprint are available still:
http://www.rcstore.com/rs/general/de...3774&catego=PL

Thank you, this is where I found the photo!
But is this really the model which is described in MAN 1977, because I think this is a control-line autogyro.
I'm searching for RC tandem autogyros!
Steve

Steve....

A couple of years ago, Jim Baxter experimented with an RC tandem autogyro design. I Believe that
it never flew successfully. I observed some of the flight attempts and the plane was not at all well
behaved. However, installation of a PA-1 might be a way to go.

BillF

Thanks BillF,
any other experiences?[sm=idea.gif]

Steve...

Thinking about this question a bit further, Mickey Nowell might be able to make one fly with his swashplate rotor hubs.
Based on Jim Baxter's experiences, hand launching didn't work well. In addition maybe with a pre-rotator set up as Mickey has
done, the plane might be able to get off the ground in a controlled fashion.

BillF

[ul][*] Are the rotors supposed to rotate to same or different direction in tandem configuration? [*]How much there should be height different between the rotors? [*] Are both rotors supposed to move to all directions or is it enough to have the control in either rotor? (Which one?)
[/ul]

Hi Lizard!
The rotors must rotate at different directions to overcome lift dissymmetry.
The hight difference between the two rotors is not critical, as there are no flapping hinges required. The rotor blades are just installed in a rigid manner.
Georges Chaulet (JoJo) achieved to build a flying tandem model. He only used rudder control and fore-aft-tilt of the front rotor. It seems to have been adequate.

Steve,

The reason I asked the height difference is the turbulence from the first rotor to the second one. This turbulence has a negative effect on the sesond rotors lift with high angles of attack. I tried to explain the problem in the picture attached. This is the same reason, why in Rutans Quickies rear wing is much higher than the first one.


Rutan's Quickie

I am trying to imagine the lift situation with two counter rotating rigid heads. For me it would be almost the same to make rigid or flapping heads as I have a access to CNC-machine.

I still haven's started building my other twin rotor autogyro. I might build this one instead of the original idea. The blades (6* 33cm) are already made.

"Georges Chaulet (JoJo) achieved to build a flying tandem model. He only used rudder control and fore-aft-tilt of the front rotor. It seems to have been adequate."
I am sure i have a copy of the article that i was sent by Jo jo somewhere and i could scan it if anyone is interested but it may be in french! Bill

This one is from Spain with DC control in front and fixed in the rear.

Hi Wahid,

Not sure, but the front rotor looks like it has a control rod on the side which would indicate side tilt control for the gyro. Do you have other pictures?

Phil

Hi Wahid,

very interesting! Do you have further information about this autogyro? Who built it? (Emilio Cabezas?)

I dont remember which thread I got it from but it is from the following spanish autogyro Pages:

http://www.miliamperios.com/foro/viewforum.php?f=50

Hi here's a video of my Tandem autogyro.

[link=http://media.putfile.com/Tan-Giro-43]Tan-Giro[/link]

/Magnus