A Rolls Royce engine with a difference

[rickshaw]

A Rolls Royce engine with a difference - duel rotary diesel!   

[zenrat]

Interesting.

Thank you.

[PR19_Kit]

Hmmmm, I'm pretty sure I've seen that basic idea before somewhere, but not as a diesel.

I rotary supercharger feeding a rotary engine, but a petrol one. maybe Mazda did it too?

[Hobbes]

The only Mazda blown rotaries I know of used turbochargers. I did see a Jaguar AJ6 with one piston used as a compressor once, but that was an April Fools article 

[Rheged]

An interesting piece of kit.   Bentley in the 1920's used Roots rotary blowers: I assume that Rolls Royce noted the idea when they took over.

[zenrat]

There have been two stroke motorcycle engines with a secondary supercharging piston compressing the charge.
Can't remember who built them but I want to say a pre WW2 German company.  NSU?  DKW?  Adler?
Or maybe it was Jawa or CZ?

An interesting piece of kit.   Bentley in the 1920's used Roots rotary blowers: I assume that Rolls Royce noted the idea when they took over.

Roots type blowers use lobed rotors which intermesh. 

https://en.wikipedia.org/wiki/Roots-type_supercharger
This is different to the Wankel engine concept.

https://en.wikipedia.org/wiki/Wankel_engine

[perttime]

"All runs on the test bed required using externally produced compressed air, the engine did never run under its own power. It is said that due to financial problems, the Wankel Diesel engine project was cancelled in 1974. It was conjectured, that the Yom Kippur War made the British Military lose the interest in a compact tank powerplant, resulting in governmental subsidies to get cut. It is much more likely though, that designing a working Wankel Diesel engine is simply not possible."

https://en.wikipedia.org/wiki/Wankel_Diesel_engine#Rolls-Royce

[PR19_Kit]

"All runs on the test bed required using externally produced compressed air, the engine did never run under its own power. It is said that due to financial problems, the Wankel Diesel engine project was cancelled in 1974. It was conjectured, that the Yom Kippur War made the British Military lose the interest in a compact tank powerplant, resulting in governmental subsidies to get cut. It is much more likely though, that designing a working Wankel Diesel engine is simply not possible."

https://en.wikipedia.org/wiki/Wankel_Diesel_engine#Rolls-Royce

VERY interesting, specially the last section entitled 'Felix Wankel' as it looks like he DID manage to make the idea work, albeit with a different shaped rotor and combustion chamber.

I wonder which bit of Rolls Royce were doing this work, the car bit in Crewe or the aero engine bit in Derby.

[McColm]

Is it the same type of engine as those which powered the NSU Ro 80?

[perttime]

Is it the same type of engine as those which powered the NSU Ro 80?

Same wankel idea, but dieselized: needs more compression to achieve ignition without spark plugs.