Thx, Steve Isee them now. Nice job on your P-51. That 4 blade really makes the model look good, especially with the "real animal" in the back ground. I have seen Betty Jane many times here in CT and have a ride in it on my bucket list. Man O' Man you really lucked out getting that free ride. You know that costs around 3G's for an hours worth.
Too bad you won't running the Zinger prop with the R65. I think, though, the Vario prop will perform close enough to it so your data will still be apple and apples. I talked to Zinger and he said the blade hub thickness measures out to be 1-3/8" thick and the R65 shaft length is 1-9/16". Not much left for threads. Looks like I'll have to make special nut.
Here's some E-Calc data for a 22x16x4 prop, 12S and 5800 maH, 200 amp ESC and a 24 lb model (my Spitfire):
@ optimum motor efficiency
111 amps
4335 watts
5856 rpm
@ max motor conditions
155 amps,
5733 watts
5442 rpm
4.8 min flight time
Good luck flying with the 4 blade.
Mark