ORIGINAL: captain2
this the NGH GT17 gasser just installed on my GP Super Skybolt. Replacing an OS 91 4s, the plane does have some flights behind it. The GT17 mounted inverted instead of sideways using the same GP 60-120 adjustable mount. Fits well, and a lot neater, engine length is just right (5.8'') for the cowl. These pics from break-in, note that I also switched the gear for a bit more prop clearance. The OS was swinging a 14x7 APC, the 14x8 the recommended break-in prop but the NGH looks like it'll handle a 15x7/8 or 16x6 no problem. Haven't flown it quite yet, but expect the plane to be transformed with the 15 or 16'' props.
I have 2 of the NGH GT17's. They both turn a JXF Nylon 14x8 at 9,100 on the ground and unload to 10,100 in the air (confirmed by telemetry). They turn a Xoar wood 15x6 at 8,800 on the ground I haven't tested that prop in the air.
I used to fly my Skybolt with an OS .91 Surpass II which turned a 14x6 at 9,800 and it was almost perfect but i always wanted a little more.
The NGH should just about ideal. I thought about getting another Skybolt and putting my spare NGH into it.
I'll take a 30cc sized Skybolt with a tunnel to take a canister muffler please.