The chassis is characterized by simplicity of construction, 

 which was one of Knox's objectives in designing a 3-wheeled 

 car. The angle-iron frame is roughly triangular, with the 

 two sides parallel for half their length at the rear, then con- 

 verging to a point at the front. There is a cross member 

 at the center, where the sides begin to converge. The con- 

 verging sides sweep upward at the front to a motorcycle- 

 type fork in the apex of the triangle. This fork is steered 

 by a tiller pivoted to the upper end of the fork so that it can 

 be moved away from the driver. The rear of the chassis is 

 bolted directly to the bearing housings of the rear-axle 

 shafts. 



The hub of the left wheel contains a bevel-gear differen- 

 tial, requiring that the axle shaft of the right wheel pass 

 through the short tubular shaft of the left wheel, with the 

 driving sprocket attached to the inner end of the tubular 

 shaft. The three wheels are each radially wire-spoked, 

 mounting single-tube 28-by-2 1 / / 2-inch tires. A small mud- 

 guard, turning with the fork, is mounted behind the front 

 wheel. 



The chassis is unsprung, all springing being between the 

 chassis and the body and consisting of three full-elliptic 

 springs, one at each side in the rear and one mounted 

 transversely at the front just behind the fork. 



The engine is a 1 -cylinder unit of 4 1 / / 2-inch bore and 

 6-inch stroke, rated at 8 horsepower. It is air-cooled by 

 radiation from a large number of small rods projecting from 

 the cylinder. The engine is mounted horizontally in the 

 center of the car, with the crankshaft parallel to the ground 

 and with the cylinder to the rear. It is supported by two 

 metal hangers, one attaching it to the chassis at the back 

 and the other to the cross member in the center. 



The right end of the crankshaft has a small eccentric, 

 which drove a push rod connected to a piston-shaped valve 

 in the valve chamber. A cam, driven at half crankshaft 

 speed, operated another push rod, which actuated a poppet 

 valve located between the combustion chamber and the pis- 

 ton valve. The poppet valve, which remained open for 

 substantially 360° of the turning of the crankshaft, served 

 as both exhaust and intake valve, the piston valve's position 



60 



