About 10-12 years ago I built a Sterling Ringmaster Bipe from an Estes kit. A few years ago I converted from the standard Glow Reed valve to electric, and last year I crashed it. So I finally have gotten around to repairing it. The original conversion left it a bit tail heavy and the vertical CG was a bit off, both which probably contributed to my crash(in addition to my trying to show off and hang the model ala carrier). So some changes were made.
Electric motors are lighter than glow and Bipes have short noses typically, a bad combo. I have extended the nose a bit. I added a ply piece to the firewall and I am using a stick mount to get the motor even a bit more forward. I also moved the leadout exit point at the wing tip up(the original kit had it on the bottom wing) and changed the battery mounting to center the vertical CG more between the wings.
The plane is now much more stable. It is fully stunt-able (at least what you can expect from a simple all sheet model) on a 3 cell battery and makes a gentle trainer on 2 cells.
The current setup is a Hobbyking AX2306N-2000 motor with either a 2 or 3 cell 500mah battery. With a Cox 6x3 prop it draws about 8 amps and gives 15.5K on 2 cells and 12.2K on 2 cells. Motor control is via 2.4GHz radio.
Just a little paint touch up remains.
Topic: Sterling(Estes) Ringmaster Bipe (Read 2444 times)