Supermarine Sea Lion
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Supermarine Sea Lion

R.J. Mitchell, who later designed the Spitfire, joined Supermarine in 1917. A racing design, the Sea Lion was developed from an earlier aircraft designed to meet an Admiralty experimental requirement to compete in the 1919 Schneider Trophy race, but was badly damaged by an underwater obstruction. Undeterred, Mitchell went on to redesign the Sea Lion (II) biplane flying boat (itself a derivative of the Sea King fighter), powered by a strut-mounted single pusher engine. The new Sea Lion won the 1922 Schneider race in Naples. The Sea Lion (III) was fitted with an uprated engine for the 1923 event at Cowes, but only managed third place. Mitchell was well aware of the need to decrease drag and moved on to design the S.IV.

 ENGINE1 x 450hp Napier Lion V12 engine
    Take-off weight1425 kg3142 lb
    Wingspan9.75 m32 ft 0 in
    Length7.54 m25 ft 9 in
    Max. speed233 km/h145 mph

Peter Sherrard, 10.12.2010

Apologies!Please ignore my previos comment. The Napier Lion was a 24 Litre engine with three four cylinder blocks in what is better described as a broad arrow congiguration driving a common crankshaft. Designed in the first world war it was very succesflul through to the 1930's

Peter Sherrard, 09.12.2010

The Napier Lion was a W formation, three six cylinder blocks on a common cranlkcase blocks

Johnny .45, 11.06.2010

So which is this...the Sea Lion I or Sea Lion II? They are different designs, right?

C.Brough, 18.04.2008

Please do you have any information on the members of the design team for this aircraft? C Brough.

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