jj_jetmech
Well Known Member
I have ended up with a IO360 A1A. I had planned a p-valve 360 but an option came my way and I'm moving this direction now. Plus there's things I like about the angle valve engine... Knowing this engine is 20-25lbs heavier per the TCDS I'm gravitating towards the WW 74 or 200... As it is 10lbs lighter than the BA..
Clearly there are greater considerations than just the actual weight of the propeller..
These other considerations have taken me exactly where many of you have already gone... I had knee surgery on Thursday so I'm stuck on the sofa and have spent no fewer than 10 hours reading about Tosional Vibration, Power Pulses, Inertia etc... Including but not limited to previous VAF threads and P&W's document about development of the R-2800.. Not trying to start that debate but based on what I have learned I have questions.
WW states the following in their manual:
Recommended Non-Continuous Operating Ranges
Whirl Wind follows historical industry standards and recommends that continuous operation between 2,050 - 2,300 RPM and 2,600 - 2,700 RPM be avoided when used on Lycoming and similar four cylinder aircraft engines. (Take off and climb out is not considered continuous operation.)
This seems to be a blanket statement. Is this based on real data or vibration surveys by WW? Why is there no mention of M.P. Limitations? Hartzell has provided data and limitations specific to each model Lycoming as they operate in the certified world and apparently have done real testing..
I'm going to call Lycoming, Hartzel and WW tomorrow. In the mean time can anyone provide further detail or links to previous discussions that address this question...
I get the feeling the testing has been done by the customers. I've heard great things about WW props but need just a little more info before also becoming a customer..
Thanks,
Clearly there are greater considerations than just the actual weight of the propeller..
These other considerations have taken me exactly where many of you have already gone... I had knee surgery on Thursday so I'm stuck on the sofa and have spent no fewer than 10 hours reading about Tosional Vibration, Power Pulses, Inertia etc... Including but not limited to previous VAF threads and P&W's document about development of the R-2800.. Not trying to start that debate but based on what I have learned I have questions.
WW states the following in their manual:
Recommended Non-Continuous Operating Ranges
Whirl Wind follows historical industry standards and recommends that continuous operation between 2,050 - 2,300 RPM and 2,600 - 2,700 RPM be avoided when used on Lycoming and similar four cylinder aircraft engines. (Take off and climb out is not considered continuous operation.)
This seems to be a blanket statement. Is this based on real data or vibration surveys by WW? Why is there no mention of M.P. Limitations? Hartzell has provided data and limitations specific to each model Lycoming as they operate in the certified world and apparently have done real testing..
I'm going to call Lycoming, Hartzel and WW tomorrow. In the mean time can anyone provide further detail or links to previous discussions that address this question...
I get the feeling the testing has been done by the customers. I've heard great things about WW props but need just a little more info before also becoming a customer..
Thanks,