Rubber launchers are fine, you just need the right rubber. It all comes down to experimenting with rubber of different thickness. If you are not getting the height you want try some thicker rubber (there are many places to buy custom rubber). It's possible to use a spring to launch it, but I don't recommend that. Not sure about the rubber restriction, think that's only for wright stuff/ helicopters.
Read through the forum, you'll find a number of suggestions discussed in some detail already in a dedicated string specifically asking for help on launchers.
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