XXavier
Member
- Joined
- Nov 13, 2006
- Messages
- 1,481
- Location
- Madrid, Spain
- Aircraft
- ELA R-100 and Magni M24 autogyros
- Total Flight Time
- 913 gyro (June 2023)
Hello all...
I'm currently flying an ELA gyro, fitted with a 912 engine and a three-blade DUC propeller. The machine has now only 30 hours, and the stick shake has been very strong from the start. I believed that it could perhaps be due to an imbalance of the rotor blades, but yesterday, while making very long, gliding finals, I realized that the shake wasn't present when the engine was idling, independently of the airspeed. I tried gliding at different speeds, from 40 to 85 mph, and the stick shake was always very light, coming back strongly only when I opened the throttle.
I'm now suspecting that the cause of the shake may be related to a resonance between the propeller and the rotor. I've noticed that it reaches a maximum when the engine revs are around 5500...
Any comments?
I'm currently flying an ELA gyro, fitted with a 912 engine and a three-blade DUC propeller. The machine has now only 30 hours, and the stick shake has been very strong from the start. I believed that it could perhaps be due to an imbalance of the rotor blades, but yesterday, while making very long, gliding finals, I realized that the shake wasn't present when the engine was idling, independently of the airspeed. I tried gliding at different speeds, from 40 to 85 mph, and the stick shake was always very light, coming back strongly only when I opened the throttle.
I'm now suspecting that the cause of the shake may be related to a resonance between the propeller and the rotor. I've noticed that it reaches a maximum when the engine revs are around 5500...
Any comments?