Hi there, My name is Adrian and I am new here. I would like your advice and views on the following challenge. I would like to make a slingshot rifle that shoots small steel balls as fast as possible. One of the problems with rubber bands is that even fired without ammo, they still have a finite speed of about (I'm guessing here) 70 m/s. Tubes are even slower. One of the reasons for the finite speed is, in my view, material hysteresis and the fact that the rubber has to accelerate it self and the pouch too. The last fact I think is the main reason for tapered bands to shoot faster. An airgun shoots small bullets at about 200 m/s. It would be nice to reach that speed with a rubber powered gun. What we need is a mechanical construction that accelerates the contraction of the rubber. For this I came up with 2 ideas. 1) The rubber pulls a string that makes a small wheel spin that is connected on the same axis to a bigger wheel that in turn pulls a string leading to the pouch. 2) The rubber pulls a pulley that doubles the speed of the cord that it leads. This can be done twice so that the speed gets quadrupled. Both systems will dissipate energy and thus pulling force but I think that it is possible to compensate for that by simply adding more rubber. Please tell me what you think about these systems and I would also like to know what other methods you can think of. Cheers, Adrian.