Can you help me.

My new ARF, Groovy 90 3D has Wing Incidence Adjusters, on the wing and horizontal stabelizer
My question is,
What effect does the setting of these have on the plane.ie; more lift, less lift, harder or easyer to fly.
when to use them etc.
The instructions don't explain the effect of them on the plane. re performance changes.

Thank's Dave

Wing incidence is the angle of the wing in relation to the datum line of the plane (line that runs lengthwise throught the center of the plane plane).

When you have a 0 incidence, the wing is at the same angle as the datum line. It neither helps lift the plane or pushes it down.

When you have a plus incidence, the leading edge of the wing is higher than the datum line. This means the wing is at an angle. As the air flows over the wing, the wing is going to want to lift faster than just the airfoil alone would allow. The plus side is that SOME planes need a positive incidence (more lift per se) in order to fly properly. The downside is that if you have too much incidence, the plane is going to take off before the plane is moving fast enough to actually fly. The plane is going to tip stall and (usually) crash.

The incidence on the horizontal stab is USUALLY set at 0. There are some cases though where you may want to adjust it to alter/fine tune the flying characteristics of the plane.

I suggest setting the incidence as called for in the manual, and then AFTER FLYING THE PLANE decide if you want to alter them. If you do decide to alter them, USUALLY the main wing is the only one that is adjusted. I would suggest not making any changes greater than 1/4 - 1/2 degree at a time. If the incidence is not specified in the manual, I suggest setting the the incidence at 0 degrees on the main wing and 0 degrees on the horizontal stab.

Hope this helps.

It's my understanding that the adjustment is there so you can adjust incidence to suit your plane/engine combo, and flying preference. There was a review on RCU a while back about a pattern plane that had tail incidence adjustments, and they did adjust it for cleaner rolls, etc.

Thank's for that, now I understand but I think it is a bit advanced for me at the moment. I will keep it simple as you suggested and just learn to fly her before I make any ajustments.

Thank's Dave.