The Belgian Society of Automobiles Pipe exhibited an air-cooled engine in 1908 which was a curious success (Paris Air Show).

“Pipe V8”

-We can see the cooling fan for the cylinders.

-And the shape of the fan is clearer in the side diagram of the illustration below.

“Pipe V8 cross-sections”

-Very interesting is the single-valve used by this engine.

“Double single-valve on the Pipe engine”

-It can be seen in the front diagram that the body of the combined valve is large and is threaded into the cylinder head at 45° so that it is completely vertical.

-We can also see the control mechanism by rods, and the intake and exhaust ports in the body.

-The crankshaft rested on three ball bearings. Observe that the fan, behind the engine, sucked the air through the cylinders.

-Piston diameter was 100 mm, and it gave 70 CV weighing 141 Kg.

-By the shape of the fan we see that it is more exactly an "extractor".

-And the photo with the propeller must correspond to a "Pusher" engine.

“Pipe for airships”

-To a request from the French Ministry of War, Pipe responded by building a 4-cylinder in-line engine. The pistons had 160 mm bore and 180 mm stroke. The valves were placed at 45° and the engine weighed 502 kg in total.

-All with ball bearings.

From Appendix 6: We now have a schematic diagram for the Pipe motor that appears in the main text.

“Pipe engine schematic diagram”