I read a thread about this in another forum but I still have questions.
Does added up thrust pull the nose and the plane up
or
does up thrust change the angle of attack for the rest of the plane there for changing the angle of attack to down?
are the effects the same on low throttle as well as high throttle.
to keep this discussion a little simple, lets say we're talking about a fully symmetrical wing. With a zero zero zero incidence reading.
I'm no pilot so it may not be accurate to say this but I don't think this question can be answered in comparison to a full size aircraft because a full size aircraft is designed to fly at a cruising speed right? And any change it that speed also changes the altitude level right?
Has anyone tested engine thrust on a zero zero wing/stab setting? What were the results?

Most of the model airplanes we fly are over powered, so I believe the power of the engine is strong enough to overpower the control throws on most of our planes. there for up thrust delivers climbing results at the full travel of the throttle of any average model plane 0-50mph.
what do you think?

bugsiegel,

I am not sure if this is the answer to your question and I am by no means an expert on this but I had about one degree of down thrust on my saito 100 that sits on my .90 edge. The plane flying inverted at mid to high power had a tendency to climb nose up, and when landing slowing to idle speed it had the tendency to nose up, after adding two small washer's to the bottom of the motor mount it solved the problem. So the plane's engine had a tad bit of down thrust, about one degree.

Randy

Hello!
The "rule" is:Low-winged no sidetrust or down trust.
Highwinged:Some downtrust.
Catalina flying boat (ie.Kyosho):With the engines on top of the wing and the wing high over the fuselage: some uptrust and no side trust!

Regards!
Jan K
Sweden

I also am no expert but as I am scratch building a 25% Edge I have been looking into what other Edges use. I was surprised that they are different. Remember the Edge is not a low or high wing design. The wing, engine, and stab are pretty close to centerline. Most recommend 1 to 2 degrees of right thrust with no down thrust. Aerowerks who sell a very successful 60-90 size recommends 2 degrees right and 1/2 up. The up surprise's me . He also responds this, "The thrust depends on the power of the engine and the weight of the model. The more power the more thrust you will need."

I think bottom line if you want it trimmed the best some flight experimenting is necessary to match your combination.

AV8TOR,

Just an FYI: The Edge I referred to in my post was the Aeroworks .90 . To be honest I am not sure why it's called a .60 /.90 as I am sure you know that any 60 size engine will fly it but you can count the 3D out.