Szekely SR-3

{{Infobox aircraft begin

|name = SR-3

|image = Szekely SR-3.jpg

|caption = SR-3 Model L - Flathead version of the Szekely SR-3 aircraft engine, Pima Air & Space Museum

}}{{Infobox Aircraft Engine

|type=Radial engine

|manufacturer= Szekely

|national origin=

|first run=

|major applications=

|number built =

|program cost =

|unit cost =

|developed from =

|developed into =

|variants with their own articles =

}}

Szekely aircraft engines were three-cylinder radial engines built in Holland, Michigan in the 1920s and 30s. They were used to power small aircraft such as the Rearwin Junior, Taylor H-2 and American Eagle Eaglet. Often criticized for reliability issues and design flaws, many were replaced with better engines in their original airframes. Few examples still exist but a museum quality example is on display in the Holland Museum in Holland, Michigan.

File:Szekely radial.jpg

Variants

Data from:Jane's all the World's Aircraft 1931{{cite book |title=Jane's all the World's Aircraft 1931 |editor1-last=Grey |editor1-first=C.G. |year=1931 |publisher=Sampson Low, Marston & company, ltd |location=London |page=86d}}

;SR-3 O:Overhead valve combustion chamber, compression ratio 4.6:1, {{cvt|45|hp}} at 1,750 rpm.

;SR-3 L:Side-valve combustion chamber, compression ratio 5:1, {{cvt|30|hp}} at 1,750 rpm.

Applications

Specifications (SR-3 Model O)

{{pistonspecs|

|ref=American Engine Specifications,{{cite magazine|title=Table 4: American Engine Specifications|magazine=Aviation |date=July 1931|volume=30|issue=7|page=43|url=http://archive.aviationweek.com/issue/19310701/#!&pid=432|url-access=registration }} Jane's all the World's Aircraft 1938,{{cite book |title=Jane's all the World's Aircraft 1938 |editor1-last=Grey |editor1-first=C.G. |year=1938 |publisher=Sampson Low, Marston & company, ltd |location=London |editor2-last=Bridgman|editor2-first=Leonard|page=102d}} Jane's all the World's Aircraft 1931

|type=Three-cylinder radial engine

|bore={{convert|4+1/8|in|mm|0|abbr=on}}

|stroke={{convert|4+3/4|in|mm|0|abbr=on}}

|displacement={{convert|191|cuin|L|abbr=on}}

|length={{convert|25|in|mm|0|abbr=on}} overall

|diameter={{convert|36|in|mm|0|abbr=on}} (Model L {{cvt|30|in}})

|width=

|height=

|weight={{convert|147|lb|kg|abbr=on}}

|valvetrain= one camshaft per cylinder: pushrod-operated overhead inlet outlet valves, one each per cylinder; (Model L valves directly operated by tappets.)

|supercharger=

|turbocharger=

|fuelsystem=Stromberg NA-S3 Carburetor or Zenith equivalent

|fueltype=

|oilsystem=

|coolingsystem=Air-cooled

|power={{convert|45|hp|kW|abbr=on}} at 1,750 rpm

|specpower=

|compression=

|fuelcon=

|specfuelcon=0.60 lb/(hp·h) [0.365 kg/(kW·h)]

|oilcon=0.16 lb/(hp·h)

|power/weight=

|designer=

|reduction_gear=

|general_other=

|components_other=Bosch FU6/3 or Scintilla magnetoes

|performance_other=

}}

See also

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References

{{Commons category}}

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