Aerospace Engines A to Z
Aerospace Engines A to Z

Updated: 23-Mar-2017

It is the "Comet Engine Corp." in Madison, WI, the manufacturer of at least three 7-cylinder radial engines.

-In 1928, the 7-D model appears. This air-cooled engine gave 150 hp and had a displacement of 612 cu.in.

-Also in 1928, appears the 7-RA that gave 130 hp.

-And in 1929 came out the 7-E that gave 165 hp with the same displacement as the 7-RA.

Comet
"Comet"

-The above drawing is complemented with this photograph of the Comet engine, manufactured in Wisconsin around 1929.

Comet engine with frontal exhaust manifold
"Comet engine with frontal exhaust manifold"

-This engine had a half-desmodromic valve actuation system, acting with a single push-pull control rod and a single rocker arm.

-Therefore the valves were aligned, the front one with the rear one.

Engines of COMET (Comet Engine Corp)

Model: 7D, 7 cils. radial, 150 HP
Model: 7E, radial 7 cils., 165 HP
Model: 7RA, 7 cils. radial, 130 HP

The author of this edition of Aeroengines AtoZ, through Aeroteca, collaborated on Version 2 of this video, which is presented here.

To understand the operation of the connecting rods, the 1929 Continental R 670 single-cylinder engine was chosen.

A demonstration of Version 3, improved at the author's suggestion, is also available on YouTube at a later date. This version shows bronze valve guides, improved valve spring movement, and the split crankshaft counterweights and front bearing balls also move.

The design is from Juan Soler, Sant Cugat, Barcelona

Below we show a flash of version 3

Counting also with the coloboration of JMC of Enginys Mecanics in Mataro, Barcelona