What are to look for prevention of damage/crash?
A1: These are the important things: • Make sure all screw are tight • Ball links are not loose, easily come out from the balls. • Make sure rotation pin at the end of starter shaft is center. • Get a correctly machined shaft for metal fan. • Blade grip pitch movements are free all the way to the extreme positions. • Engine is stable; do In Flight Hover check before proceed with other maneuver. • Turbo Fan (or Metal Fan) need precisely machined starter shaft. I almost trash the bearing when using custom made shaft. • Frame/Engine/upper frame mount locations are very precise. A crash may move them a bit. Need to make sure all moving part have enough clearance. Had problem with Metal Fan touching the upper frame fan cover resulting in engine died and not able to start.
