HobbyCAD
Homebuilt Heli Enthusiast
Excellent project to do. Are you planning to do it stock, or incorporate some of the new Exec designs.
Here some interesting engine stuff http://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/engine_issues.htm
and some drive sprocket info http://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/background.htm
Here some interesting engine stuff http://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/engine_issues.htm
and some drive sprocket info http://www.epi-eng.com/rotorway_helicopter/rotor_drive_system/background.htm