All,
I have an engineer looking at the design of the driveshaft for my V-8 experiment. Concerning gyroscopic loads using the standard 78 inch Hartzel 3 blade, we have run into a calculated shaft size that exceeds aviation norms. What is driving this is his reference to the FAR’s that states yaw and pitch acceleration of 2.5 and 1.0 radians/second respectively. My question is: Is this a limit, or an endurance load? If the 2.5 rads/sec is an endurance load, then the shaft size is calculated to be over 4 inches to handle the 70 pound propeller at 3000 RPM. Clearly, the AEIO 540 swings this propeller and does not have a 4 inch shaft, so what is the nature of this rads/sec specification?
Thanks
Mike
I have an engineer looking at the design of the driveshaft for my V-8 experiment. Concerning gyroscopic loads using the standard 78 inch Hartzel 3 blade, we have run into a calculated shaft size that exceeds aviation norms. What is driving this is his reference to the FAR’s that states yaw and pitch acceleration of 2.5 and 1.0 radians/second respectively. My question is: Is this a limit, or an endurance load? If the 2.5 rads/sec is an endurance load, then the shaft size is calculated to be over 4 inches to handle the 70 pound propeller at 3000 RPM. Clearly, the AEIO 540 swings this propeller and does not have a 4 inch shaft, so what is the nature of this rads/sec specification?
Thanks
Mike