Well I had a rare engine failure yesterday, The CRANKPIN broke of the crankshaft on my Moki 1.35. I put a 1.60 in its place, But I don't know of what prop to use.
Any starting points for Imac flying? The plane is a Sig Cap that weighs 11.5 lbs. Also, expected RPM's would be great.
Thanks,

Pro Zinger 18x6.....more for 3 D work.

I like the Moki and Mez 18x8 for sequence work....

Pugs

I use a pro-zinger 18x8 with a kline regulator (put my tank on the cg). It works great on my Sig extra at 13.2lbs.

Same prop for APC? Thier 18" and up looks funny, why

I use a 18x10/17x12 APC for Pattern,
with a Krumsheid pipe i get 7800 rpm.

The 18x10 has got some more pull at low speed, the 17x12 is for pattern the best, because it keeps the plane going.

18-8 is the largest, or I'd start seeing it overheat. I settled with the Pro Zinger 18-6. There is more RPM's with that prop, but I find myself bouncing back and forth. I have those motors on two of my planes, GP-202 and Edge.
RickP
BTW - I love them

I Tried a bunch of props and finally settled on the APC 18X8 for the GP Giles 202

I tried a bunch too and think the Mezjlik 18x8 is the best. Pro Zinger 18x8 turned much faster but didn't have as much thrust. Are you running a pump? 5 of us at the field have pumped 160's and are running the mezjlik and all get a consistant 8500 on the ground. Pro Z 18x8- 9000. Reg Z 18x8- 8000. Large APC's have a smaller area and not as much load on the engine. I don't know why, maybe to make their numbers look good. Anyway, they are more for speed instead of thrust.

You should try the APC 19x8 W, I have used this with great success on a OS 140RX in a Funtana.

The W fun fly props are better. The APCs we used were the letter opener blades, yuk.

a.k.a. Ginsu Knife

How about the APC 18x6W ? Is it to little prop? It also has the Profile similar to the 17x6 and 17x8 APC (those are the props that I ran on my moki 1.35 before it broke)

Could you guys give some expected RPM's with these props? I am going to break it in on Saturday, There is a fly in on Sunday.

Thanks Again,

I got 9100 on 18x6W, but the spool up was interesting