Hi Bobby. This is Tom, I have no idea why IH changed my name. Hope you've been doing well. Honestly, the Liquid Piston engine doesn't excite me. For all the talk about superiority over a Wankel, it has the same weakness that has doomed Wankels over the years -- the seals. A lot of time and money has been put into rotary engine seals over the years and the solutions still don't compare to piston rings in typical engines. The rotor is also fairly complex to manufacture, and it needs very precise tolerances to function properly. It's a lot easier to hone a cylinder than to produce complicated housings and rotors to the same tolerances. Then, I am bothered by the entire issue of lubrication. It isn't as though we have oil jets or splash lubrication up the cylinder bores playing on the walls. That oil spray also cools off the piston to prevent burnout. They claim that they can lubricate the seals without excess oil consumption, but we are talking about a line seal versus the restriction provided by a piston in a cylinder. Oil in the combustion chamber is going to make it very, very hard to meet emission regulations. Then there's the issue of thermal management, the surface area to volume ratio looks relatively unfavorable...I'd expect the engine will lose overall efficiency due to this. Finally, like so many other 'clever' mechanical arrangments, the force is hardly tangential to the rotor -- you get far better mechanical advantage with a crankshaft and connecting rod. I'd guess that you need to spin this thing at really high rpm to generate the same power as a piston engine -- which introduces friction problems that reduce life expectancy and fuel efficiency.