RC Plane Bungee launch system 8mm 6kg
This ramp system can be used on rough or good ground - getting the model of the ground saves it from all that scuffing and damage that stones etc. can do. The Bungee is capable of launching 2+kg models ... but at that level - I have a 10mm similar setup that I can get more tension and pull. Plastic water pipe fittings ... scrap ply ... nail ... door hinge and padlock fitting.

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