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1917 Imperial Propeller, Mercedes 100HP engine

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Producer (type)Imperial Propeller, Germany
Propeller No.2153
Production Date1917
Pitch145 cm
Diameter270 cm
EngineMercedes 100 HP
Country of OriginGermany
Used onAlbatros B.I.

 

About the propeller. The propeller is preserved in good shape. Except the propeller number and the engine type also  a pitch (H – 145 cm) and diameter markings (D – 270 cm) are clearly pressed on the hub. Also decals – both Pattee Cross (used by four German propeller producers) and manufacturer’s are well preserved. The manufacturing date of this prop is 1917-1918. Other markings visible are test speed and German airworthiness approval: GEPRÜFT FLZ. Comparing the other known Mercedes 100 propeller the pitch has been increased slightly – by 5 cm.

Construction. The propeller lamination consists of 7 plies including: ash, mahogany, and walnut(?). No sheathing fitted.

Aircraft and Engine. The propeller was powered by 74 KW (100 HP) inline, water-cooled, anti-clockwise rotation engine. Designed before WWI by the end of the war Mercedes 100 engine was already obsolete, so the propeller was most likely a replacement one. Aircraft powered by this engine were (for example) some WWI reconnaissance aircraft – Albatros B.I. and Aviatik B.

References:

  1.  Bob Gardner, WW I Aircraft propellers, Volume 3.

 

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