RE: OS 61 Hanno Special question
The carb throat in the OS RF-ABC-P is a lot bigger than the one in the Hanno. The Hanno doesn't really like to turn over 11,000 and 9,500 - 10,000 rpm is probably ideal. The Hanno will run nicely at lower rpm (down to about 9,000 peak), but the needle gets a little sensitive (that was with an APC 13x11 - I now use 12x11, 12.5x11, 13x9, 13x10). My favorite prop with the RF-P was an APC 12x10 (with the stock piston/sleeve). The Shadel (performance specialties) piston/sleeve (the pre-hanno version) added some signficant rpm so I preferred an APC 12x10W or 12x11.
-Will Bartlett