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Scratch building flying boat

Old 03-03-2016, 06:22 PM
  #1  
Roger Gray
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Default Scratch building flying boat

I am building a flying boat from my own design. This is the first one I have built with the engine on a pod above the fuse. It is going to be constructed using several different methods, all fun. To be about 100 plus in.wing span. My question is- should the wing and horizontal stab incidence be 0 degrees, and what should be the angle of attack for the engine and does it need to be a few degrees offset to the right?
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Old 03-04-2016, 07:02 AM
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BMatthews
 
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For a design of this sort that appears to be a "sort of scale" design I'd suggest you want the wing to be set at a couple of degrees positive to the fuselage keel line as well as the stab. This will aid in coming off the water with a flatter fuselage angle for the takeoff as well as giving you some decalage angle between the wing and tail for pitch stability.

The engine is going to need a fair bit of up thrust to prevent driving the nose into the water. I'd say set it to about +5 and leave room in the way you mount the engine for a good three degrees of adjustment from there. The closer the prop is to being directly above the CG the more angle you'll find is required.

A degree to degree and a half of right would not be a bad thing either.
Old 03-09-2016, 05:12 PM
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Roger Gray
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Thanks for your reply, I'm doing just as you said. That is about what I wanted to do, maybe not so much on the engine thrust but I can see why it would be best.

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