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  1. K

    Air pressure vs explosive pressure

    Alright, this might be a dumb question.. my friend and I are in a little debate. I have built two kinds of "potato cannons": one uses the force of a acetelyne gas + oxygen reaction for the energy (single explosion, flings it far). The other uses actual compressed air: I would pump air into a...
  2. K

    Converting latitude/longitude to Cartesian coords?

    Does anyone have a quick method to do this?
  3. K

    Where to buy bulk chemicals?

    By "bulk chemical" i mean I need a pound of calcium carbide. anyone know where to get it? If i get it under its laymans headng, as in the stuff used for hobbying, its kind of expensive, esp for a large quantity. I assume this is markup. Thanks.