Why not have both!
This looks very interesting, I would love to see the data that backs up their claim of 80% thermal efficiency but this looks like it might be the closest thing yet to replace reciprocating (i.e. piston) IC engines?
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Oof, that video is a bit much, but I did this to myself.
It starts with the claim of needing no apex seal when clearly it does.
Realistically, you can reach about 2/3 of the Carnot-Efficiency, because all processes are far from isothermic (thermal losses).
The Carnot-Efficiency is defined as 1-(T_cold/T_hot). Add a factor of 2/3 for real life applicability. See if you can spot the issue with getting to 80% in practice.
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Exactly 
That struck me as well, I will have to have another watch to see if I can see how it does seal the case/combustion cycle (I have helped rebuild a rotary or two in my time, including a mate who had a peripheral port 13B in his RX4, that thing ate apex seals 
)…
To me it seemed like the Rotary/Wankel analogy was a bit misleading. Maybe it is a rethink of turbine technology and with a scavenge effect it doesn’t need a gas tight seal? Technically a turbo jet is a four-stroke (suck, squeeze, ignite, exhaust) and I have seen them turning over when switched off when the wind is strong enough.
Anyway. I am glad to get everyones thoughts because the company seems legit and I’m not prepared to call ‘snake oil’ yet… except for that 80% claim
I had another look and now I am thinking ‘rotary pulse jet’… There wasn’t a lot of detail about what was going on in the exhaust section/outlet chamber of the engine.
There also seemed to be a lot of fluid leakage with engine on the test stand, NFI what that could be?
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It is clearly a rotary engine. In a turbine, combustion happens continuously, which is not the case here.
High efficiency requires high compression, which turn requires a tight seal. The more leakage happens, the less thermal energy is converted to mechanical energy.
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