to fly a bigger prop than a 9-3.8 on the bl-8 is not the best idea, may fry it, instead id save that for another plane, and go with a silver series 12 amp, and then a 10-3.8 prop should be ok. also for next time fo easy on the glue, i build them using foam safe CA only except for a little six minute epoxy for the motor mount, If its over 10 oz. it heavier than it should be mine I'd imagine is around 7-8(its a Radix) and hovers at half throttle no prob on the rimfire, bl-8 and 9-3.8 prop. so I'd weigh it first and go from there.