[8D]X-Jet veeeeeeery interesting. Tell me (if you can without revealing too much proprietary info if possible) what is the length and weight of this 50lbs thrust valveless? I'm amazed at the thrust and heat ranges you described as well. If you accomplished reducing the heat range alone in this design, thats an amazing accomplishment, irregardless of whether or not you can make it small enough for Rc. Small jet home built aircraft could be really cool with this as a powerplant. I actually have some design ideas for such, depending on the cost and weight of the engine involved/fuel/duration etc. One concept I've been toying with for a while is a one man, flying wing craft in which the pilot flys in a semi prone position, head forward. With a jet producing around 100lbs thrust (and the only thing standing in the way of the valveless was heat) this could be viable. If the design is realized in the way I think it could be, you could hang this aircraft on a wall in your garage....well...depending on how elaborate or simple you decide to make it. Anyway...would love to talk with you about it, and learn more about what you've accomplished.

Regards ZZ.