RE: BT Bf109E-4
Tubig
I too am planning on building the my BT 109E, but have chosen the RCV Sp120 for it. Why?? I think the engines are good design, but a bit underpowered even with the 2:1 gear down. Still i liked them enough to own the 120.
Note that on RCV's web site thier SP120 max wieght for a plane is 11lbs. The 90 may not be the ideal engine for the BT 109E. It may be better for the BT 109F 61" span, a project also in the rafters somewhere.
See thier web site for inpotant specs. Note that according to RCV, normal operating temp for this engine is between 315F- 356F. Seems, hot but thats what the email said.
Steve