Interesting Engines

Here's a 300cc and 600cc versions used for UAVs...FWIW

http://www.nwuav.com/uav-products/uav-rotary-engines.html

Jack Hilditch


Interesting Engines. Notice that it also burns Jet fuel with a reduced
compression ratio. Wonder if it is possible to convert a Mazda rotary to
burn Jet fuel, even with a slightly reduced output.

Henry nee


Nice 3D's but until I see some actual results it is vapour ware IMHO.

Paul Lamar



A typically low compression ratio Wankel rotary engine can stand low octane grade fuel but is not naturally suited to burn heavy fuel.
(the combustion temperature is too low and the amount of unburnt fuel in exhaust is high)

IMHO, there is two possibly efficient ways to burn heavy fuel in a Wankel rotary :

- First increase the temperature of fuel to inject it as a compressed gaz when the poor air-fuel mixture compression is close to completion.
(Almost a diesel mode with poor air/ fuel mixture and still spark plug ignition)
This would lead to a stratified charge and a hopefully more efficient combustion.

- Second, increase the total compression ratio to a value equivalent to a diesel engine.
This has been experienced by Rolls-Royce with two rotors of different size, the larger one feeding the smaller one with compressed air and completing the hot gas expansion back from the smaller one. The fuel was injected at highest compression time for diesel type ignition.
More efficient way is to use turbo charging in turbo compound mode : Higher compression as well as better thermal energy recovery.
But this means starting the engine on light fuel with spark plug ignition, and when hot at high charge, switching progressively to turbo compound diesel mode.

At the crossing of those two ways : Very high pressure Direct fuel injection in a high pressure turbo compounded Wankel... On either light or heavy fuel when hot.



   Philippe DEJEAN

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