Originally Posted by RichardS
I am new to this sport and have questions. Why do some of my planes dive to the left as they leave the ground? I am on grass as my runway. How do I control this?
Minnesota? Where in Mn? I grew up in Alexandria.
As for your planes "Diving to the left" as they leave the ground. As others have indicated, make certain you've got sufficient flying speed before pulling up elevator. If you are lifting off at just above stalling speed of your model, the propeller torque is going to rotate the model in the opposite direction. On my giant Big Stick with it's 3000 watt motor, the torque effect of that motor is the same as putting a one pound lead brick on the left wing tip. And, just above stalling speed, at full power, that left wing tip is going to drop like a rock. (Don't ask! Nearly bent up the model six feet off the ground because of this effect.)
Part of the problem is that prop up front. The airblast from that prop is rotating, down wind, and when that airblast hits the rudder, it pushes the rudder to the right, resulting in the model turning to the left.
So, just apply a little bit of right rudder during take off, and only shortly after leaving the ground.
As to how severe this issue is, it depends on the type of model. I've got a giant Big Stick model where rudder is absolutely required during takeoff. And some smaller models that just go like heck during takeoff, and little rudder is required.