Hi

My model (40 size acrowot) always starts to dive when applying much rudder(both ways). whats is my problem?

With rudder only will airplane dive.. When using rudder, give elevator a bit lift (climp) to prevent diving.

Jens Eirik

hmmmmmmmmm ? i noticed that, but why is it like that...... [X(]

The wings lift less when the airplane turns than when it is flying straight. So you give it a little up elevator to increase the wing incidence and get the lift back. Us old free flighters know what to do even if we don't know why.

I am new also so this would be just a guess from what a few guys have talked to me about.Also what I have seen from many planes.Is it a possability that the Horizontal aft is not equil to the stabilizer?Have you checked all measurements to make sure A=A from the horizantal stabilizer to the leading edges?Also I think the throws could be a factor or possably your pitch angle for your high rate rudder is like out of what the exact specs should be.IE like 1-1/4 or 32mm right and left.This is just a guess from an someone who has no real foundation but learning from some great guys online.I have however found that many strange quirks can occure from misaligned parts -Ailerons and inproper installed servos and or recivers and also mis "piched " rudders.Could you have your servo set not in the mid position but majory adjusted on your remote to compensate causing the upset? I personally would check the measurements and see that they are equil.

Are you using Mode 1 or 2?

I dont think its the measurements that are unequal, but im going to check that.

Mode 1 or Mode2 ? What is that?

thanks

Simple aerodynamics, as soon as you start to bank, you have less lift in the vertical direction so the plane starts to sink. You would have a miracle on your hands if it did not.

A marked dive with "much rudder" isn't unusual with some planes, due to the location of the rudder surface area and the horizontal inertial axis.
When this axis passes below most (or all) of the rudder area, the rudder will pitch the nose down as the plane banks.
On my 1/6th scale Stearmann, it's forceful enough to make using the rudder close to the ground a delicate situation.
Other planes will merely yaw a lot with a lot of rudder.
It's aerodynamic and inertial characteristics combined.

Thanks Paul, you explain very well. Perhaps there is some kind of mixing for this in the radio. _Or_ I can learn how to fly instead

Blue, the pitch with rudder is one of the things that makes the Lazy Bee so much fun to fly!
It isn't always a "bad thing".