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The similar Jack Armstrong aircraft were designed to be gliders.
I haven't tried it with the Rigby's that Don has been modifying, but based on past experience, I think you will be able to get them to glide if you laminate the wings with an additional thickness of paper, increase the size of the model to about an 8-inch wing span, leave off the prop and landing gear, and put enough weight in the nose so that the plane balances at the center of gravity (about 1/3 of the wing chord). The Jack Armstrong planes generally worked great with a U.S. penny in the nose, and you can do fine tuning with little bits of plasticine.
Don
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