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Inside the Butler Aircraft hanger and shop...

 
The amazing Wright Turbo Compound R-3350 engine - twin-row, supercharged, air-cooled, 18 cylinder radial engine. Displaces 3350 cu. inches. When factory-new and operating on Aviation 130 octane fuel, the engine produced 3350 HP. Butler currently runs the engines on 100LL and derates the engines to approximately 2750HP. The engine is massive and represents the pinnacle of piston engine development.

This particular engine is used for spare parts, as it had a catastrophic failure on one cylinder.
Another shot of the R-3350.
  I get VERY excited when I spy the PRU units on this engine. The PRU (Power Recovery Unit - I've also heard it called a PRT, or Power Recovery Turbine) is an exhaused gas turbine that is directly tied back into the main crankshaft via a gear assembly. There are three PRU's on each engine, and they recover about 100HP each from the exhaust stream.
Jake stands next to a DC-7 APU. You can see the cylinders and generator.
Below, prop from the DC-7. BIG.  Second photo will give you another sense of the scale of the prop.  In the third photo, Rick explains the mechanics of the prop and governor assembly. This shot gives you a good idea of the size of the prop. I don't recall the exact diameter, but estimate that it was between 12' and 18'.  Fourth photo is another shot of the square-end prop.
  Front nose-gear tire. Jake (5 years old) gives a sense of its size.
The pig roaster - you won't find it in the DC-7 maintenance guide, but it is critical for hanger parties ;-).
Yeah, this stuff is awesome!
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