Aerospace Engines A to Z
Aerospace Engines A to Z

Updated: 17-Sep-2023

CONSTANT PRESSURE ENGINES Inc

(USA)


CONSTANT PRESSURE ENGINES Inc engine specifications

Pennsylvania company that offers two products: the Sadler and the Vaux engine, produced and developed by this company.

Constant Pressure Engines, Sadler
"Sadler"

-The Sadler R-1765-U is a double-row radial engine with a total of 6 cylinders, and an ignition angle of 120°. It uses VW car cylinders and pistons.

-It gave 65 hp at 3000 rpm with a displacement of 1721 cc. The compression ratio was 9.5 to 1.

-The other engine is the Vaux that uses the "Scotch Yoke" system.

-That is, a rigid connecting rod that links the two pistons and in the center there is a perpendicular slot that allows the crankshaft to rotate while the rod is moving from one side to the other and visa versa. (see Bourke).

-It is a small horizontally-opposed, four-cylinder engine.

-It has a piston diameter of 2,125 inch and a 1875 inch stroke.

-This two-stroke engine is air cooled and gives 25/30 hp of power.

Constant-Vaux
"Constant-Vaux"

From appendix 6: The best-known product of this brand is the Sadler radial engine (see).

Constant Pressure Engines, Sadler
"Constant Pressure Engines, Sadler"

-We now have a prototype made by Chuck Kemner and Roger Richard in the 1980's based on Bourke systems.

Prototipo de Chuck y Roger
"Chuck y Roger prototype"

-It has two horizontally opposed cylinders and two stroke. Presumably with the Scotch Yoke system instead of common connecting rods.

Engines of CONSTANT PRESSURE ENGINES Inc

Model: Constant-Vaux

Arquitecture: 2-stroke4-cylinder Horizontally opposed
Cooling: Air
Total Displacement:
Bore / Stroke: 2.125 x 1.875 inch
Power: 25 / 30 HP @ rpm
Weight:

Other details:

“Scotch Yoke” system.

Constant-Vaux engine

"Constant-Vaux engine"

Model: Prototype boxer

Arquitecture: 2-stroke2-cylinder Horizontally opposed
Cooling:
Total Displacement:
Bore / Stroke:
Power: @ rpm
Weight:

Other details:

Bourke type.

Chuck y Roger prototype

"Chuck y Roger prototype"

Model: Sadler R-1765-U

Arquitecture: 6-cylinder Radial
Cooling:
Total Displacement: 1721 cc
Bore / Stroke:
Power: 65 HP @ 3000 rpm
Weight:

Other details:

It uses VW car cylinders and pistons.

Sadler radial engine

"Sadler radial engine"

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