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Old Jun 20, 2012, 04:35 AM
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An itch?. Scratch build.
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South Wales U.K.
Joined Mar 2003
15,407 Posts
Having a look at some of the articles on pylon mounted motors, (addition of power to glider, and some references to flyingboats etc). The trust angle on quite a few of them is 'up trust', i.e. the angle is up at the front.

There are reasons for that, position relative the the CG, angling the air flow down onto the horizontal stab etc.

But where is the change over point between up thrust and down trust ? (relative to the thrust line being above the CG as in the model shown and various pylon mounts).

I know it can also be influenced by other factors such as wing incidence, wing section, the amount of thrust etc.
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