Jacobs R-755


The Jacobs R-755 is a seven-cylinder, air-cooled, radial engine for aircraft manufactured in the United States by the Jacobs Aircraft Engine Company.

Design and development

The R-755 was first run in 1933 and was still in production in the 1970s. With a bore and stroke of 5.25 in × 5 in the displacement was 757 cu in, power ranged from 200 hp to 350 hp. The engine features steel cylinders with aluminum-alloy cylinder heads. An R-755E variant was developed for use in helicopters.

Variants

;R-755A1:The base-line direct drive production version.
;R-755A2:300 hp variant.
;R-755A3:Similar to A1 but with Scintilla magnetoes.
;R-755B1:De-rated version of the R-755A to drive a fixed pitch airscrew.
;R-755B2:De-rated version of the R-755A to drive a variable or controllable pitch airscrew.
;R-755E:Up-rated engine with reduction gearing.
;R-755EH:Developed to power the Jacobs Type 104 Gyrodyne.

Applications