RE: Goldberg YAK 54 - 77"
My CG 77" Edge has the DL50 and I couldn't be any more pleased with it. A few were concerned with using a 50cc gas engine with these birds, but the truth of the matter is that the frame is well suited for the job. I had to do some work on the firewall to fit the larger engine. I suppose the Yak, being of similar dimensions can benefit from having a 50cc gas engine in the nose, whether a DA or DL50.
Make sure you have 10kg servos all around though.