Aerospace Engines A to Z
Aerospace Engines A to Z

Updated: 22-May-2019

By 1910 this manufacturer offered two radial rotary engines with 7 cylinders.

-The 30-35 HP and the 70-80 HP, weighing 3 lbs per HP. This was a high index since in the war and post war it was 1 Kg/HP and later below the Kilo.

Holmes engine hold by a laborer
“Holmes engine hold by a laborer”

-Below we show a 1910 ad, date of the engine offer.

“Holmes Rotary Motor ad”
“Holmes Rotary Motor ad”

Engines of HOLMES ROTARY MOTOR

Model: 7 cyl. rotary 30-35 HP

Arquitecture: 7-cylinder Rotary
Cooling:
Total Displacement:
Bore / Stroke:
Power: 35 HP
Weight:

Other details:
Model: 7 cyl. rotary 70-80 HP

Arquitecture: 7-cylinder Rotary
Cooling:
Total Displacement:
Bore / Stroke:
Power: 80 HP
Weight:

Other details:

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