ORIGINAL: kaz1104
Wow...we followed up on the..... "Do a search for Picco in the pattern Forum..seems like a couple of guys have put the .80 in a pattern plane to give it a little more power now that the 10cc rule no longer matters. .....
They were talking about propellor choice 12x10, 13x9 !!!!
We are currently running a Rossi 60 on a 14x5 and figured that was overpropped.... was going to use the same prop on the RC80.... figured it should be swinging around 13500 - 14000 for an 80's style pattern motor that these picco's are. (14" APC according to APC's website should be run at maximum of around 13500 RPM for safety reasons)
Any comments???
They over-prop the engines for quiet operation and good pulling power. If you are not in competition, I wouldn't worry about running so much prop.
The P-80 fan engine, while designed for fan use, is destined for a prop. It will have to be a smaller prop than what you would want on a pattern plane to take advantage of the timing of the fan engine. I think any of the other .60~.80 engines you have would be better for pattern use.
And don't get bogged down in a bunch of number-crunching mumbo-jumbo. Just look at the .80 as a really strong .60. Prop it just a little heavier than you would a normal .60 (try to keep the tip speed in check), and go have some fun with what will be a much more peppy plane.