• Before flying, hold the model upright and check the amount of clearance between the leading edge of the upper rotor blades and the upper surface of the upper blade support. The clearance should be approximately 1/8 inch as shown in the illustration. It should be the same for both blades. If necessary, carefully adjust the wire hinge. Also, check both hinges to see that they move freely
• Wind the upper rotor clockwise. As you wind, knots will form in the rubber stripping. In general, a double row of knots is the minimum needed, and a tripper row is about as much stress as the stripping can stand.
• To launch the model, hold it by the bottom, release the upper rotor and allow it to bgin rotating. Then let go of the bottom. Do not toss the model upward

The helicraft should climb easily to a heigh of 12 to 15 feet and then descend smoothly to the ground. As with any flying model, air currents will have a major effect on its performance. If you wish to experiment, vary the angle of the upper rotor hinge wires. A smaller angle will increase the speed of the rotor and thereby enhance stability, but the craft will not climb as high. A typical flight characteristic of the model is to spiral upward, then down while flying in approximately a six-foot circle. A carefully constructed and precisely adjusted model will fly straight up and remain almost stationary over the ground when the air is calm