[stansdds]

The Bearcat, Hellcat, Corsair, and Thunderbolt all use the same engine as did a variety of other aircraft, but they don't always sound the same. The sound is altered by the shape of the prop blades, number of blades, length of the blades, exhaust collector arrangement, exhaust pipe length, turns, and exactly where the pipes exit the airframe. The P-47 exhaust had three possible exits, the two waste gates just behind the engine or the turbocharger exhaust port just ahead of the tailwheel. The P-47's engine note tends to be lower pitched and less of a staccato sound than the Bearcat, which had three pipes on either side of the fuselage. The B-25 is a great example of how short, individual ports sound. It uses a 14 cylinder 2600 cubic inch engine, but the sounds coming from the individual ports gives it a distinct and very loud sound.