Potez 6D
{{short description|1940s French aircraft piston engine}}
| {{Infobox aircraft begin
| name=Potez 6D | image=File:Moteur Potez 6D 02A.jpg | caption=Potez 6D on display at Musée de l'Aviation de Lyon-Corbas }}{{Infobox Aircraft Engine |type=Six cylinder air-cooled inline piston engine |manufacturer=Société de Avions et Moteurs Henry Potez |designer= |national origin=France |first run= |major applications=Morane-Saulnier Alcyon |produced= |number built= |program cost= |unit cost= |developed from= |variants with their own articles= }} |
The Potez 6D is a French six cylinder inverted inline aircraft engine put into production after World War II in normal and supercharged versions. Unsupercharged, it produced a take-off power of {{convert|240|hp|kW|0|abbr=on|order=flip}} at 2,530 rpm.
Design and development
In the 1930s Potez planned a series of new engines to replace their Anzani-derived radial engines. The Potez 4D, a four-cylinder inverted inline engine ran before World War II but did not reach production until the late 1940s, when it was joined by another inverted inline, the six cylinder 6D, and an eight-cylinder inverted-V, the Potez 8D. The D-series engines had much in common, most obviously sharing pistons and cylinders, with the same stroke, bore and valve gear. The inlines also shared connecting rods and lubrication systems and were offered in normally aspirated or supercharged versions.
Variants
Data from Jane's All the World's aircraft 1956-57 pp. 430–1.
;6D-00:
;6D-02: Similar to 6D-30A without supercharger and 2x Hobson A1.55/j downdraught carburettors - {{convert|240|hp|kW|0|abbr=on|order=flip}} at 2,530 rpm
;6D-30A: Supercharged version with a centrifugal blower (14.0:1 drive ratio) mounted horizontally on top of engine and with fuel injection, giving a normal power of {{convert|260|hp|kW|0|abbr=on|order=flip}} with {{convert|305|hp|kW|0|abbr=on|order=flip}} for take-off.
;6D-30B: Supercharger drive ratio 15.5:1, {{convert|340|hp|kW|0|abbr=on|order=flip}} for take-off at 2,400 rpm.
Applications
- Morane-Saulnier Alcyon - over 200 built
- Nord Noralpha
- Nord Norécrin
Survivors
Specifications (Potez 6D-02)
{{pistonspecs|
|ref=Jane's All the World's aircraft 1956-57 pp.430-1.
|type=Six cylinder air-cooled inverted piston engine.
|bore={{convert|125|mm|in|2|abbr=on}}
|stroke={{convert|120|mm|in|2|abbr=on}}
|displacement={{convert|8.83|L|cuin|0|abbr=on}}
|length={{convert|1550|mm|in|2|abbr=on}}
|diameter=
|width={{convert|510|mm|in|2|abbr=on}}
|height={{convert|668.5|mm|in|2|abbr=on}}
|weight={{convert|235|kg|lb|0|abbr=on}} without accessories.
|valvetrain=Two valves/cylinder; exhaust valve sodium cooled. Valves operated from camshaft in overhead crankcase vis push-rods, roller tappets and rocker arms.
|supercharger=None.
|turbocharger=
|fuelsystem=Two Hobson AI55/J carburettors with auto altitude correction. Provision for aerobatics. Double magneto, two plugs/cylinder.
|fueltype=80 Octane minimum
|oilsystem=Dry sump; one pressure and two scavenging pumps.
|coolingsystem=Air.
|power=Normal at sea level, {{convert|230|hp|kW|0|abbr=on|order=flip}} at 2,500 rpm; take-off, {{convert|240|hp|kW|0|abbr=on|order=flip}} at 2,530 rpm.
|specpower=
|compression=7:1
|fuelcon= At economical cruising ({{convert|135|hp|kW|0|abbr=on|order=flip}}), {{convert|27.7|kg|lb|1|abbr=on}}/hour.
|specfuelcon=
|oilcon=
|power/weight=
|designer=
|reduction_gear=Direct
|general_other=
|components_other=Pistons, connecting rods and crankshaft: Y-alloy pistons with two compression and two scraper rings. I-section forged aluminium alloy connecting rods, with split big-ends and lead -bronze bearings. Six throw, forged nitrided Ni-Cr-Mo steel crankshaft. Ball thrust bearing and seven lead-bronze plated bearings. Cast aluminium-alloy crankcase.
|performance_other=
}}
See also
References
{{Commons category}}
{{Reflist|refs=
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{{Potez aeroengines}}