two stroke or four stroke power?
I am building a 60-90 Extra330s and I am trying to decide on power. Any ideas on what might work best is welcome. THe plane weight is 3400 gr (7.5 lbs) has a 63.8in. wing span and is 53.6in. long. I want to try flying it 3D more than sport. The manual recomends a 60-91 two stroke but I was thinking of a 90-1.20 four and swing a larger prop.....any thoughts? Thanks,Tugboat.