The OS weighs about 23 oz ready to fly. The YS almost 27 oz, so there's about a 4 oz difference. The OS only has acceptable power for a 91 sized 4C, while the YS is the king of this size, being compared to some 120 4C rather than 91s.

How did everyone's planes balance? Was it tail heavy due to all those servos being located in the back of the plane (aka would a heavier motor actually balance the plane better)?

Thanks!