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Keep everything constant except that which you are testing, and perform each experiment more than once and take average results.
You could keep the helicopter in the same proportions, but gradually increase its overall size, or keep the width of the wings and the body constant, and gradually increase the length of the wings and body.
Helicopters
Age 7 to 16
Challenge Level 
Keep everything constant except that which you are testing, and perform each experiment more than once and take average results.
You could keep the helicopter in the same proportions, but gradually increase its overall size, or keep the width of the wings and the body constant, and gradually increase the length of the wings and body.
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