RE: Motor question for RC glider
Although for special effects only, a black powder motor is a cheap and readily available way to make smoke and fire out the tailpipe. If the motor had to do any genuine work on this model, then you'd need a lot more than typical RC rocket glider motors. Other than the SJ motors with black smoke, the other glider motors (E6, D7, G12 etc) are low smoke propellant and won't do much for creating visual effects. A 7 pound model would need a lot more than even the G class RCRG motors to get a significant boost from the motor. The G12 for example has an average thrust of 12N or a bit under 3 pounds.