Chaise 4B
{{Short description|1930s aircraft engine}}
| {{Infobox Aircraft Begin
| name=Chaise 4B | image= | caption= }}{{Infobox Aircraft Engine |type=Inverted air-cooled V-4 piston engine |manufacturer=Societe Anonyme Omnium Metallurgique et Industriel |designer= |national origin=France |first run= |major applications= |produced= |number built= |program cost= |unit cost= |developed from= |variants with their own articles= }} |
The Chaise 4B is an aircraft engine designed and built in France during the 1930s, unusual in being an inverted air-cooled 14º V-4.
Design and development
During the early 1930s Societe Anonyme Omnium Metallurgique et Industriel / Etablissements Chaise et Cie, commonly known as Moteurs Chaise, designed and produced a compact lightweight four-cylinder aircraft engine developing {{convert|130|-|155|hp|abbr=on}}. To reduce overall dimensions and length of crankshaft Chaise designed an inverted V-4 with a very small vee angle of 14º. With staggered banks the 4B was both narrow and short.
The light alloy (R.R.50) crankcase supported the major components of the engine. Heat treated steel cylinders were bolted to the crankcase and light alloy (R.R.50) cylinder heads were screwed onto the barrels. Accessories were mounted at the rear with magnetos driven by camshafts running either side of the crankcase, which also operated the valves by pushrods and rocker arms with triple concentric return springs.
Variants
;4B: Standard production engine
;4Ba: the 4B with improvements
Specifications (4B)
{{pistonspecs|
|ref=Le moteur Chaise 4-B 4 cylindres inversés{{cite journal|title=Le moteur Chaise 4-B 4 cylindres inversés|journal=Les Ailes|date=20 November 1932|issue=596bis|page=5|url=http://gallica.bnf.fr/ark:/12148/bpt6k65601932.item|accessdate=29 July 2017|location=Paris|language=French|format=pdf}}
|type=air-cooled inverted 14º V-4
|bore={{convert|125|mm|abbr=on}}
|stroke={{convert|140|mm|abbr=on}}
|displacement={{convert|7|L|cuin|abbr=on}}
|length={{convert|660|mm|abbr=on}}
|diameter=
|width={{convert|480|mm|abbr=on}}
|height=
|weight={{convert|135|kg|abbr=on}}
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|supercharger=
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|coolingsystem=Air
|power={{convert|130|hp|abbr=on}} at 2100 rpm, {{convert|155|hp|abbr=on}} at 2300 rpm
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References
{{Reflist}}
{{DEFAULTSORT:Chaise 4B}}
Category:1930s aircraft piston engines
Category:Air-cooled aircraft piston engines