Propped for a warbird
I have an APC 18x12 on a Moki 2.10 turns 8500rpm on the ground with an ambient around 85degrees. Using Performance Plus 5%nitro with 20% oil and OS F plug. Large fuel line and no pump.
This combo powers a WM GS P-51D at 16# 12oz
Have about 3 gallons through it so far.