QUESTION: I’m going to buy a new twin-engine boat. What can you tell me about counter-rotation outboards? ANSWER: Counter-rotation outboards turn their propellers in opposite directions. The starboard ...

Late last year, Safran completed a ground-test campaign with a full-scale counter-rotating open rotor (CROR) engine on an impressive outdoor testbed, almost 10 years after the launch of the ...

Astron aerospace has shown a partial prototype of a new rotary combustion engine it claims runs at an extraordinary 60% thermal efficiency, burning totally clean with zero NOx emissions and nothing ...

Dan Gurney, a famous racer from the 1970s, came back under the spotlight with a patent for a new type of engine. The legendary driver, who was known for his unusual height and the “bubbles” that the ...

GE Aviation and NASA will run a wind tunnel test program over the northern summer to evaluate and test counter-rotating fan-blade systems for open-rotor jet engine designs. The newly improved rig for ...

Rotating engines have long fascinated car enthusiasts for their compact design and smooth power delivery. Despite their unique appeal, they’ve struggled with efficiency and emissions, limiting wide ...

The Defense Advanced Research Projects Agency (DARPA) has joined forces with Raytheon to advance the development of a groundbreaking air-breathing rotating detonation engine called Gambit. Unlike ...

There have been published papers by the Air Force Research Lab and NASA on rotating detonation engines having 10% or more efficiency gains. A rotating detonation engine (RDE) uses a form of pressure ...