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
Engines on display
- A preserved Jacobs R-755 is on display at the Arkansas Air Museum.
- A Jacobs R-755 is on public display at the Aerospace Museum of California
- A preserved Jacobs R-755 is on display at in Medicine Hat, Canada.
- A restored Jacobs R-755A is on display at the House of Whitley.
Specifications (R-755-A1)