come see us at the 2012 Elizabethtown Fair August 20-25 in the Memorial building

18 Cylinder Radial Engine | Horse Drawn Sled | Clockwork Jack

Pratt & Whitney R-4360 Wasp Major

r-4360

Photo of a Pratt & Whitney R-4360 Wasp Major on a display stand. Note the size of the engine compared to the boy underneath the engine.

r-4360

A SolidWorks drawing of the engine. I have drawn most of the engine including all internal parts to ensure proper fit and location. The engine will have 28 cylinders, 7 independent electronic ignitions, a pressure and scavenge oil pump. 5 main bearings, & 5 cams.

r-4360

Four aluminum engine case segments are bolted together being machined for cylinder placement. There are 28 cylinders of 1” bore and 1 ¼” stroke.

r-4360

Brass Main Bearing with cam gear ring & cam gear bearing holes. The bearing is mounted in an aluminum fixture for machining.

r-4360

Crank case section with two piece brass main bearing. The main bearing shows the cam ring to support the hardened cam. Also shown are the cam drive gear flange bearings.

r-4360

Main bearing with cam gears. The cam rotates 1/8 the speed as the crank shaft. The cam is shown but does not have the cam lopes machined onto it yet. The internal teeth on the cam were cut with a wire EDM. The other drive gears were machined from round stock on an indexer.

r-4360

Main bearing with cam, cam gears, and cam retaining plate. The tappet holes are shown above the cylinder holes.

r-4360

Gear blanks were made from round bar stock and machined on an indexer. The individual gears were machined from the gear blanks. All the distributor gears are 32 diametrical pitch.

r-4360

Machining the distributor drive bevel gear.

r-4360

Distributor case with gears. Shown are the bevel gears from the previous photo. The distributors need to turn ½ the speed as the crankshaft.

r-4360

3D machining the supercharger housing using a ¼" ball end mill. I started with a 7" diameter solid aluminum stock. The photo shows a finished integral motor mount. To the left of the end mill is a motor mount that has not been machined yet. This piece will also house the supercharger fan, radial motor mounts, and intake manifold tubes.

r-4360

Mock up of the Pratt & Whitney R-4360 Wasp Major engine crank case with distributor case and 32” diameter prop.

r-4360

r-4360

r-4360