I have a YS 91 on my bipe and it is great...My bipe is wayyy to heavy also (my fault)...but the 91 does a very good job...I am going to put a YS 120 on there only because I have another use for the 91...If you built your plane light I would think the 91 would be a super set-up!!...not sure it would capable of hovering or not...I would say great vertical but it would eventually fall off I think...if mine were lighter I could tell you for sure...dang it...