Rotary - "A rotary engine is essentially a standard Otto cycle engine, with cylinders arranged radially around a central crankshaft just like a conventional radial engine, but instead of having a fixed cylinder block with rotating crankshaft, the crankshaft remains stationary and the entire cylinder block rotates around it." Wiki.

the cylinders clearly rotate. rotary.

Please don’t get too upset by the lack of club propellor - we took a great deal of care in what we did. A club propellor is only needed to absorb significant amounts of horsepower. This engine was only run a number of times to return it to life before being refitted back onto the Mosquito - with its propellor…. These runs were determine its behaviour and condition after a period in storage. The throttle linkage was rigged to limit rpm to idle only and as such is no different to running an automotive engine in neutral. Best regards, The Hacks.

@@larrylewislarry So noted! I used to rebuild these engines when I was a wee lad in the early 80’s for an outfit in Sacramento California. I can only tell you that I replaced many, many, many, many valve seats and guides. I love the big Merlin’s and Griffons, the sounds coming out of our test cell when we were pushing 100” of mercury was astounding. Those race engines were nothing short of spectacular! We ran clubs on everything as the crankshaft counterweights absolutely would not tolerate ANY slappage!

We chose to limit the rpm to idle only until the Merlin was back on the aircraft with a propellor attached.

@@larrylewislarry makes sense, but i wanted to hear it roar