whifof100ll
Well Known Member
Since I have not yet selected a prop, I have been reading about the FP/CS tradeoff issues. I understand CS is better for climb, ecomony, cruise, ect. FP better for cost, weight ect. One disadvantage that I have recently considered came to light when interviewing a freind after an engine failure in his Hartzell equipped RV. He said he came down like a rock. The same thing that gave him very good control of decent speed and short feild landing performance, costs him in glide performance. Since these props do not have a feather position like a twin, I would think they would flatten out on loss of power trying to maintain the RPM. Has anyone experimented with pulling the black knob all the way out, then pulling the blue one to see if it improves glide distance.
I think here a wood cruise prop would have the advantage since it would maintain it's high pitch, and has low intertial mass which combine to allow the prop to stop windmilling at a higher airspeed.
I know that stopping a CS prop would greatly increase glide distance, but I would not want to think about that in an emergency situation. Also I would worry about departing too much from best glide speed.
Relevant experiences would be appreciated.
Regards,
Dale
RV-6 finishing kit.
I think here a wood cruise prop would have the advantage since it would maintain it's high pitch, and has low intertial mass which combine to allow the prop to stop windmilling at a higher airspeed.
I know that stopping a CS prop would greatly increase glide distance, but I would not want to think about that in an emergency situation. Also I would worry about departing too much from best glide speed.
Relevant experiences would be appreciated.
Regards,
Dale
RV-6 finishing kit.