ORIGINAL: proptop
Sounds pretty darn good to me!
Just a wee bit rich is a good thing...because once it gets moving, the prop will unload a little bit...maybe not as much as it might in an airplane, but actual testing on the boat will tell.
Temp changes will effect tune as well...but you already know that.
I'd say she's pretty good now...about as close as you need 'er to be. The rest of the fine tuning can be done while running the boat, I would think?
How fast do ya think you could get your air boat going on the snow?
I think it sounds good too. I want to run the 10x5 once and see what kind of rpms I get. I have a strong feeling the 9x7 (though it spins fast) isn't going to be enough thrust to get this pig moving.. This little .46 needs to move a 5lb Outrigger around. I think the numbers I was getting with the 10x6 (14,600) wasnt all it could do. I would think it should be in the 15k area but time will tell. The 10x6 and 9x7 have close to the same prop load, so I would think the 10x6 though slower will move the craft faster. I think the 10x5 might be the meal ticket if I cant get any better RPMS from the 10x6. Bob in the Jett forum said something about having the engine over 15k to really be working the pipe so thats kind of what I'm shooting for.
The boat this engine is going onto can't run on land, but my K&B .65 flatbottom boat does about 33mph on the water, and maybe 40 on grass.. I haven't tried it on snow yet... (I have a 13x6 on it now and I have a 13x7 waiting for it... have to add ballast to the front before I put the 13x7 on it. At 33mph its airborne and eventually upside down.)