RE: 140+ mph H9 Sundowner 50 Arf
I have the 90 LX on a GP minnow with the extensions, and like Bob said you do lose some Rpms.
I am running at about 14,600 on an 11X8 APC and it loves it right there, I also have a 90 LX
on the Cermark F-16 and thats running at 15,100 on an 11X8 APC.