Batteries, smoke and roar...
Ah the good old days!!
When I first started playing with radial engines a friend and I would start them in his garage with a separate fuel and oil tank. After starting and running the first one we quickly learned that it needed to be attached at the top to a ceiling joist - because that engine just about took off as we cranked on the carb fuel supply before the governor kicked in ! Lots of torque and with magneto ignition a runaway engine would be hard to shut down until it ran out of fuel. By the way all the engines I ever ran had high oil pressure in the 60-70 pounds region while running. We also learned to prime the dry sump oil system thoroughly before running the engine so that we had oil in those weak - link bearings and didn't unintentionally wreck something.
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