I'm building a Lippisch ground effect vehicle with it's wingtips almost touching the ground, but because of torque effects the left wing actually does touch the ground, so it can't lift off. It even can't go straight. Adding ailerons isn't an option because this problem has to be solved on te ground (zero speed) and not in the air (because it doesn't get there). Does someone know something how I can solve this problem?
The commenters are right: Either use two separate propellers (left and right) which turn in opposite direction, or use a counter-rotating prop.
This picture of a P-38 shows the principle. You can drive both props from the same engine by using driveshafts or belts. The Wright flyer had such an arrangement.
On small airplanes with very big engines a gearbox with concentric driveshafts is driving both propellers in opposite direction.
A simpler way to have contra-rotating props is to put them at opposite ends of an engine pod.
In all cases the prop torque is reduced to zero, or in case of the podded arrangement, almost zero.