ORIGINAL: Ed Cregger
Sometimes, on really aerobatic models, I want the engine to be dead square without compensation through shims. The better you get, the less you will rely on such tricks, but these tricks can be very handy for those without a lot of flight time.
Ed,
Did you take a close look at the Sukhoi 26/31 planes?
They are definitely models and full-size planes, intended for unlimited aerobatic competition.
The amount of side-thrust built into this plane, is visible from any angle and is very obvious.
...And as to down-thrust; it is true mostly of high-wing models, with plenty of dihedral...
When you have a low-wing plane, with little, or no dihedral, you may want some up-thrust, to counter the plane's tendency to lower its nose when power is applied.