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Your video, Liquid Piston Rotary Engine - In Slow Motoin, has made it into the Top 15 New Videos listing. Congratulations on your achievement. For your contribution you have been awarded 1 Power Point.

Liquid Piston Rotary Engine - In Slow Motoin has been added as a related post - related requested by newtboy on that post.

I thought by comparing itself to existing technologies, it was being up front that it’s just moving from purely theoretical to prototype. Maybe that’s not as clear to others?

I’m fairly certain every single point there was made about the Wankel when it was prototyped…look at it now! Edit: in fact, wankel side seals are the likely solution…it has the same rotary “side bleed” issue and they do ok.
Same for reciprocating piston engines and more.

Sure, it’s not ready for prime time, and no, it is no where near it’s theoretical potentials. What engine has been at this point? They got it to run, I’m pretty impressed with that as it’s much farther than most theoretical motor designs ever get.

This response seems to have a few gaps in it, but here's what a company rep said:

"And then there's our apex seals, they're like our piston rings," he continues. "In the Wankel engine, they're inside the rotor, again. They move at a high speed, and bounce around, they're very hard to lubricate. In our case, they're stationary, they don't bounce around, and you can lubricate them directly from the housing.

"So we basically solved the key challenges the old rotaries had with combustion and with oiling. Those oiling challenges caused both durability issues and emissions problems. By making those components stationary, we solve the challenges of the old rotary. And we also upgraded its cycle to give it much higher efficiency."

https://newatlas.com/military/liquidpiston-rotary-x-engine-army-generator/

My guess is because there's only one set of seals in the case, not a second set for the "piston", and so there's no seal to seal scraping. The smooth shape of the "piston" and lack of corners should minimize wear.

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Below is google translated of the videos description...

I am very happy to be able to write to you and to be still alive at the moment after having avoided a few crazy bikers by a few centimeters! What do you think ? How would you have reacted? I specify that the biker on the ground is fine, he is doing with his broken arm - He caught the back of the black car that we can see just before. It is not the biker on my right on the ground but the biker we can see right after who is correctly in his lane. Must say that my friend was right behind me at the time! We were very lucky! A frontal at this speed ... Nobody lives ...! V Piston

I think the "sport" pilot designation is a disaster waiting to happen. Not enough training for vehicles that are as dangerous as any regular single engine piston aircraft.

No, it's not EDM. It's machined. We produce a variety of cylinder / piston pairs, some with keyed anti rotation or beveled flanges to prevent pull through. The achievement of a visually seamless interface between two parts is certainly not trivial, but with care and the proper sequence of machining steps (guess which face you mill last? right - the one the user sees as seamless) you can do this on good quality CNC's with the right cutters. EDM'ing the complex curved shapes that truly mate across the surface on the early parts shown in the video is very (prohibitively) difficult, as you have to rely on ram EDM which is plain nasty.

I would speculate that the mushroom is just a very heavy mass that the engine lifts and drops. I'm going to guess it's 1000 tons and the engine is a modified crane. It lifts it pretty quick, so whatever is is, it's powerful. (The reason I don't think its a piston is because of the block and tackle , but that could be for something else entirely).

*quality stuff
I would like more info on the wave generator....is it a giant steam piston under the inverted mushroom?
*promote good wave *science

The basic action is, but not the mechanism.
My idea....think spiral channels inside the tube with the cog shown attached to a piston that rides in the spiral channels. As you turn it and force is transferred, it forces the piston forward because the spiral turns rotational force into linear force. With a spring, you apply an opposing linear force so the piston only moves when those forces are unbalanced. This spring could be tunable so you select where the balance point of those forces is, thus selecting the maximum force you could apply before it changes gears for you. When there's more force applied, it "lowers" the gear, when less it automatically goes up a gear. No electronics or battery required.

There is so much wrong with this video I don't even know where to start. First, there are only two types of aircraft engines, piston and turbine. When a turbine is used to drive a propeller, it's called a turbo prop. When he is talking about turbo props, he shows pictures of a piston driven propeller aircraft (Cessna 41x), and piston engines are the most common type of engine used on propeller driven aircraft, not turbo props.

He mostly gets it right about turbo jets, except again, every aircraft he shows when talking about turbo jets uses a turbo fan (the F-15 and F-16 both use afterburning turbofan engines). They get their thrust from the hot expansion of exhaust gasses, but he gets it wrong with turbo fans, which get most of their thrust from the bypass air from the fan.

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