Engine runs of a DC-6 in Columbia.
Wright R-3350 engine run, supposedly on a test stand, this engine has no PRTs so it must be an earlier series engine.
Three P-47 fighters starting up.
DC-6 performing at an airshow.
L1049 Constellation starting its engines and taking off. The large volume of smoke from the startup of radial engines is very typical because lube oil tends to drain into the lower cylinders when the engine is stopped and gets burned off at startup, this also contributes to a higher rate of oil consumption. Because the accumulation in the lower cylinders carried the risk of causing hydraulic lock, the typical startup procedure for large radial engines involves turning through at least a couple of revolutions with the ignition off to check that the pistons move freely. Most radial engines are dry-sump which means the oil is pumped in from tanks rather than being kept in a sump at the bottom of the engine.
A clip of the Blackburn Beverley, a large UK military freighter with four Bristol Centaurus sleeve-valve radial engines.