Quote:
Originally Posted by basjoos
Most aircraft climb out at a fairly shallow angle...
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That has more to do with the stall speed of the wing than the thrust from the prop. Not to get too technical, but every wing has a certain minimum airspeed - roughly 50 mph for a light plane, more for jets - below which it stops producing lift. If that happens, the plane "stalls": the nose drops abruptly, and generally one wing drops quicker than the other, which can lead to a spin. That isn't something you want to have happen close to the ground. (See stall-spin accident.)
There's also the matter of best rate & angle of climb, which are quite a bit higher than stall. But you can hold a typical small plane on the edge of stall at maybe 40 degrees nose up angle.