RE: New SV Gassers
Well, I think it might depend on the use for a SV-17cc engine as to whether it is a underpowered engine or not. If a user wanted it for 3D or something like that, it would be underpowered. But if you are flying more conventional planes, it has decent power. I have a SV-17cc engine on a Great Planes Escapade .60 RC plane, and the engine works really well on it. But when you research it some, the 20cc gas engines tend to weigh about the same as the 15cc and 17cc gas engines, and develop more power of course. So going with a 20cc for a .60 size plane is likely the better way to go. Thus it is hard to reccomend any of the 17cc or 15cc engines but instead point the way to one of the 20cc engines instead.
I do like the NGH 17cc engine though. With its front mounted carb, it makes it nice for dropping into a airplane setup for glow engines. It also seems to be more powerful than one might think too. I put it on a huge World SuperStunts .60 plane and it has power to spare.