Hmmm... Supposing the water-rockets people and the [EE] PIC people were to get together on the idea of going for altitude... Can you imagine? PIC timed stages... PIC controlled pressure release valves... It would be a thing to behold. --Brendan -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.