Nelson F2CN

[grathosas]

Anyone have any expereince in running this engines, I know it does not need a run in but what about prop sizes?

[clraceguy]

I run one. It is the rear rotor side exhaust AAC version. For props you can use either a 6.5x5.5 or 6.5x6.0 APC. A 7x5 APC sport prop would also work. If using the current front rotor engine, they like to rev, so the APC 6.5x5.5 would be a good first choice. The Nelson likes at least 1.8% DII, so you might also try that. Start out with around a .170" dia. venturi, that should give reasonable laps to start. The biggest issue with these engines with their cylinders hanging out in the breeze in an F2CN is heat management. They cool off very quickly, so they need a proper F2C type warm-up before the start, and a minimum of glide time on the pit stop to keep the heat in.

I hope this helps you some.

regards, Les

[grathosas]

Les,
I had given up on seeing any responses so sorry for the slow reply!! Tks for the info will try the prop sizes!! Question what is DII?
Again tks.

[raglafart]

DII = Diesel Ignition Improver, it stinks and lingers, sadly essential though. You could use IPN Iso propyl nitrate at around the 1.4% much nicer smelling but more expensive and probably more difficult to obtain.

[grathosas]

Raglafart,
Tks for the info. The more I learn the more I am beginning to believe I missed about 30 yrs!!!!

Cheers.