While I can't be sure, The Jet boat on this guys site may have been built by a friend of mine. It used my old JPX 260 as the power source. I was, before he sold it was the only one to drive it as I had the waiver to run it. You need a large bottle to get thru a days flying with a JPX but a small bottle will start it. The old is tapped off of the compressor side and it is imperative that it not leak in any way or bearing failure will occur. I will try and help in any way I can.