First off... the engine will be placed in an airboat, I've come to this forum because nitro airplane engines are what's used in nitro airboats. People that know a lot about nitro plane engines are gonna be here.

Ok... I want to put a .75 in a Big Dumas Swamp Buggy and need help choosing which one. Price is a concern and so is weight(top heavy) so price puts O.S. out of the picture (double what others cost), and no to Super Tigre for weighing noticeably more than the two I'm considering, a Tower Hobbies .75 or a GMS .76. Which one is the better engine? They are only $5 apart. And if GMS, it's offered in both front needle valve and remote needle valve, I don't know the difference between the two, which would the better choice be? BTW tower's engine is front needle valve.

Third question... what size 3 blade prop(puller) would I use on this .75? not a 2 blade because it wouldn't fit and CG wouldn't be great. So if there is more than one appropriate blade length 3 blade prop for a .75, I think I would want one on the smaller side.

Thanks for the help.