czechsix
Well Known Member
Guys,
I'm getting ready to do performance testing for Vx, Vy, and best glide speeds in my RV-8A with O-360/Hartzell setup. I know there are some POH's floating around out there with these numbers in them but I'm curious how many people have measured this data carefully themselves? In particular to get good glide data one would have to pull the mixture and ideally test with the prop stopped, prop rotating with oil pressure & lever aft, and prop rotating without oil pressure (fine pitch). This could take quite a few engine-off glide tests and the numbers should be pretty close from one RV to the next...
Which brings me to my point: if there's any "consensus" on these speeds amongst those of you who've taken good data it would be nice to have those numbers as a starting point for my testing. For example if Vy is typically 80-90 kts I would narrow the range of my test from 75 to 95 instead of a much broader span of numbers.
It would be cool if someone made a spreadsheet collecting this kind of data from different airplanes. Checkoway are you listening?
Thanks,
--Mark Navratil
Cedar Rapids, Iowa
RV-8A N2D flying 29.2 hours now...
I'm getting ready to do performance testing for Vx, Vy, and best glide speeds in my RV-8A with O-360/Hartzell setup. I know there are some POH's floating around out there with these numbers in them but I'm curious how many people have measured this data carefully themselves? In particular to get good glide data one would have to pull the mixture and ideally test with the prop stopped, prop rotating with oil pressure & lever aft, and prop rotating without oil pressure (fine pitch). This could take quite a few engine-off glide tests and the numbers should be pretty close from one RV to the next...
Which brings me to my point: if there's any "consensus" on these speeds amongst those of you who've taken good data it would be nice to have those numbers as a starting point for my testing. For example if Vy is typically 80-90 kts I would narrow the range of my test from 75 to 95 instead of a much broader span of numbers.
It would be cool if someone made a spreadsheet collecting this kind of data from different airplanes. Checkoway are you listening?
Thanks,
--Mark Navratil
Cedar Rapids, Iowa
RV-8A N2D flying 29.2 hours now...