ORIGINAL: bob27s
Get something with a big hub on it and cut it down (12x8 down to about 10" dia)
Well, a 10“ diameter prop would be too large in general for any ultra high performance engine ranging from 10 to 15 cc. Their timings are mostly optimised for a minimum of 22000 rpm.
You need to go to
8“ of prop diameter in order to avoid performance-killing
transonic tip speeds. [8D]
So both the ground test prop and the final carbon fiber propeller for flying should not be larger than 8“ to ensure reaching the wanted engine power band.
A big hub
ZINGER wood prop would be well suited on your OPS .65 RIRE for break-in purposes. I’d take the Zinger 11x10“ (#513) to be cut down to 8“ of diameter to load the OPS correctly on a test stand.
The original
OPS slide type carb (see below) being too expensive to buy separately you will find included to the actual
blue head or past years
red head OPS .67 marine engines. These .67 engines as perfect spare parts suppliers for any OPS .65 will also provide more top end power than the .65 due to the refined 7-ports piston/sleeve assembly.
All needed information concerning pipe length, choice of plug ... the OPS freaks will find here for instance:
[link=http://www.rcuniverse.com/forum/m_7954952/tm.htm]Ooh, look what papa got for early Christmas..[/link]