1916-1918 99" WWI Paragon Standard J-1 Hall Scott A-7a Wooden Airplane Propeller

Manufactured by the American Propeller Company, Baltimore, Maryland, USA.

This oak propeller is a true piece of aviation history. Designed for the first generation Standard J-1 (SJ-1) biplanes of the United States Army Signal Corps during WWI, it was fitted for the Hall-Scott A7A 100 HP motor. The first-generation Standard J-1 aircraft were powered by the 100HP Hall-Scott engine, which had its quirks, including the occasional flare-up during flight!

An original airplane propeller that has stood the test of time. It has never been refinished and is in remarkable condition for being almost 108 years old.

Propeller Details:

  • Markings: Hub face reads "8' 3 x 5.00, RIGHT HAND" and side of hub sports the *987*. Both blades proudly display the "Paragon" logo. The hub face also features a metal stamped plate with "Standard" logo.

  • Material Features: Oak propeller with copper leading edges.


  • Length: 99 inches
  • Motor Compatibility: Hall-Scott A7A 100 HP
  • Hub Dimensions:
    • Thickness: 4-1/4 inches
    • Width: 7-5/8 inches
    • Center Hole: 2-3/4 inches
  • Bolt Details:
    • Spacing: 6 inches from center to center
    • Size: 7/16 inches

About the Standard J-1 Biplane: The Standard J was a substitute standard basic trainer aircraft produced in the USA from 1916 to 1918. A 2-seat tandem biplane, it was crafted from wood, wire bracing, and fabric covering. Charles Healy Day's design legacy from the Sloan H series persisted in the line under the Standard Aero Corporation (later rebranded as Standard Aircraft Corporation). Between June 1917 and June 1918, four renowned companies—Standard, Dayton-Wright, Fisher Body, and Wright-Martin—produced and delivered 1,601 J-1s.

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