Hi Guys

Can anyoe help me out? I understand that in some models it's desirable to have right thrust and downthrust on the motor to counteract torque & stuff. That's on a conventional 'puller' prop set up.

I have just built a foam wing with a speed 300 DD pusher with a Gunther prop. It flies great, except ...

When I come out of a turn it pitches up, and I mean right up. Once I correctthe pitch up it seems to fly straight and level O.K. It looks like it's speed related somehow.

I also have full right aileron trim dialled in so I thought torque was a problem too.

On a 'pusher' set up do I still need down and right thrust on the motor? Or should I say would down and/or right thrust solve the problems I have.

Andy

Andy,

I would think that you need "up-thrust" on your motor (shaft pointing downward). That could be the reason your plane is pitching up. Try about 5 degrees down to start.

VP

Thanks VP

That is what I meant I thoght if the prop was pointing down that was downthrust, my mistake. What about left and right thrust to counter the prop torque?

Andy

I'd try manually adjusting the elevons first to see if that helps. I've never heard of using right/left thrust on a pusher, but someone else could amybe help on this.

VP

Originally posted by Andycart
. . . . I thought if the prop was pointing down that was downthrust, . . . .

If the prop is up front, it is.

VP

i fly the deltawing pusher mirage 2000 and the manual stated that i need 2mm up elevator and 2 degree of that "up thrust" on the motor. but i do not know the conventional wisdom on this matter.