I generally try to avoid crossposting, but since I haven't had any taker in the aerodynamics forum, I figure I will try my luck here.

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If I mount the engine such that the thrust line deviates from that which is drawn on the plan, what corrections, if any, should I make to compensate? Obviously I would need to adjust the fuel tank position to center with the carb. But would I have to adjust the downthrust also?

Specifically, the 4*60 I'm building calls for 2 degrees down thrust. If I move the thrust line farther up (mounting the engine higher up on the firewall), would I need to decrease or increase the down thrust angle?

How about incidence angles, any changes necessary there?

Thanks.