Originally Posted by rlplionel:
.......The plane stays in the air when not in use.....
That has not been my experience.
There are two control sticks which operate my MTH airplane. One is used to control power to the propeller and the other to apply lift to the arm, which is attached to the airplane. Use of these two sticks in conjuction with proper adustment of the "spring tension", allows you to takeoff, fly, and land the airplane.
The instructions which came with my MTH set take you through a series of steps to properly adjust the tension of the spring attached to the arm. In general what you are doing is adjusting the spring's tension so as to counter the weight of the airplane at the end of the arm. You start the process by releasing the tension on the spring. You then lift the plane at the end of the arm so that the arm is in a horizontal position. You then increase spring tension in steps by adjusting a nut to which the spring is attached. After increasing tension, you let go of the plane and watch what happens. Depending on whether it drops instantly to the mat or stays in the air, you increase or decrease the spring's tension until the plane gently floats back down to the mat. When it does, by applying power and lift to the plane using the control sticks, you can then fly the plane off the mat and around the tower at the end of the arm. Decrease power and lift and you can land the plane.
At Trainfest 2013 I taped back the propeller power control stick so that full power was applied to the prop whenever the layout was powered up. I then adjusted the spring tension so that when the layout was powered up and the propeller started to spin, the airplane would takeoff on its own power and fly around the tower. At the end of each day when we shutdown electrical power to the layout, the propeller stopped spinning and the airplane gently landed.
Base on the above, I believe whether or not the plane will remain on the mat, takeoff/fly/land, or remain in the air permanently is all a matter of making adjustments to the spring's tension. Too little tension, and the plane remains on the mat. Too much, and the plane remains in the air. Adusted just right, the plane will takeoff, fly and land using the two control sticks.
Obviously, since you don't have space for the mat on your layout, you will want to adjust the spring tension so that the plane is always in the air at the end of the arm.
Hope that helps!
Bob