Tandem-rotor Gyroplane

Wisey01

Newbie
Joined
Aug 21, 2019
Messages
6
Location
Australia
Joe, your research regarding this setup looks promising, and after doing a quick google it looks like someone has put a patent on it?

Cheers
Matt
 

joe r nelson

Newbie
Joined
Dec 27, 2019
Messages
1
Location
Cincinnati,Ohio
Aircraft
SF 340 for Comair Inc.
Total Flight Time
12000 hrs
I understand that mate, Just wondering how it all worked out?

Cheers
At this time, I am stuck on finding a suitable gearbox for my model. Two types were used with one from a Honda motorcycle and one purchased from a local distributer. I haven't had much success in determining the "gear box drag" and it's effect on the autorotation of the blades. The blades won't spin-up in front of my floor fans when rotors are coupled to each other's gearbox. They spin-up OK when not coupled.

The problem that arises is that when the uncoupled rotors spin-up the airframe rolls left and falls over.

A copy of a tandem rotor gyro patent was found and it shows the front rotor on a higher pylon than the rear rotor. These changes were made on the model resulting in better spin-up but it looks like it is flying backwards. I assume that this because of the difference in airflow up though the blades.

All of this, the original problem remains. How to overcome the gearbox drag?
 
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