The Jacobs R-915 or Jacobs L-6 is a seven-cylinder, air-cooled, radial engine for aircraft manufactured in the United States, production started in 1936.
Design and development
The R-915 was effectively an enlargement of the
R-755 with strengthened stressed parts.
With a
bore and
stroke
Stroke is a medical condition in which poor cerebral circulation, blood flow to a part of the brain causes cell death. There are two main types of stroke: brain ischemia, ischemic, due to lack of blood flow, and intracranial hemorrhage, hemor ...
of , for a
displacement
Displacement may refer to:
Physical sciences
Mathematics and physics
*Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path ...
of . Take-off power was around . The engine features steel
cylinders
A cylinder () has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base.
A cylinder may also be defined as an infinite ...
with aluminum-alloy
cylinder head
In a piston engine, the cylinder head sits above the cylinders, forming the roof of the combustion chamber. In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissipation fins. In more modern ...
s.
Variants
;R-915A1:Baseline variant; an enlarged
R-755
;R-915A3:Similar to the A1 but with Scintilla magnetoes
;R-915A4:With a power take-off for autogyros
Applications
*
Avro Anson Mk II and Mk III
*
Beechcraft Model 18D
*
Beechcraft F-17D Staggerwing
*
Fleet 50
*
Howard DGA-15J
*
Kellett KD-1
*
Waco AQC, AGC, ARE, AVN
Engines on display
*A preserved Jacobs R-915 is on display at the
Nanton Lancaster Society.
*A Jacobs L-6 is on display at the
Canadian Museum of FlightThe Canadian Museum of Flight - L-6
Retrieved: 31 January 2009
Specifications (R-915A1)
See also
References
Notes
Bibliography
*Gunston, Bill. ''World Encyclopedia of Aero Engines''. Cambridge, England. Patrick Stephens Limited, 1989.
*''Jane's Fighting Aircraft of World War II''. London. Studio Editions Ltd, 1989.
External links
Bomber Command Museum of Canada - Nanton Lancaster Society
FAA Type Data Certificate Sheet - R-915
{{US military piston aeroengines
1930s aircraft piston engines
Aircraft air-cooled radial piston engines
Jacobs aircraft engines