Hey guys I am fairly new to speed planes as I have been a 3D and sport flyer for a long time. I am in the planning stages of building a SPAD sickle. For those of you not familiar with SPAD building check out
www.spadtothebone.com. I attached a sample pic of what I am building. The motor I plan on using is a fairly new TT pro .46. My problem is I have absolutely no idea where to prop this thing at. I'm planning on upgrading the bearings in the engine and using a tuned pipe as well. I expecting in excess of 16K rpm's with this set up. Like I said Im mostly a 3D guy so this style of flyig is new to me. I appreciate anyhelp you guys can give.