[topflight36]

i own the goldberg 77inch yak 54. They take standard servos. It seem to be built nice. My father is building it for me and he is putting in a DA50r. It say upto a 40cc gas engine but the da is is lighter then most 40cc gas engines. I think it will fly really nice. I hear they are a really good flyer also. Remember they have oz rating for a reason. Both safety and to protect your wallet. So its your call.

Tom