Napier Sabre - Variants

Variants

Note:'

Sabre I (E.107)

(1939) 2,000 horsepower (1,490 kW).

Sabre II

(1940) 2,300 horsepower (1,715 kW). Experimental 0.332:1 propeller reduction gear ratio.

Sabre II (production variant)

2,200 horsepower (1,640 kW). Reduction gear ratio 0.274:1: mainly used in early Hawker Typhoons.

Sabre IIA

2,235 horsepower (1,665 kW). Revised ignition system: maximum boost +9 lbs.

Sabre IIB

2,400 horsepower (1,790 kW). Four choke S.U. carburettor: Mainly used in Hawker Tempest V.

Sabre IIC

2,065 horsepower (1,540 kW). Similar to Mk VII.

Sabre III

2,250 horsepower (1,680 kW). Similar to Mk IIA, tailored for the Blackburn Firebrand: 25 manufactured and installed.

Sabre IV

2,240 horsepower (1,670 kW). As Mk VA with Hobson fuel injection: preliminary flight development engine for Sabre V series. Used in Hawker Tempest I.

Sabre V

2,600 horsepower (1,940 kW). Developed MK II, redesigned supercharger with increased boost, redesigned induction system.

Sabre VA

2,600 horsepower (1,940 kW). Mk V with Hobson-R.A.E fuel injection, single-lever throttle and propeller control: used in Hawker Tempest VI.

Sabre VI

2,310 horsepower (1,720 kW). Mk VA with Rotol cooling fan: used in 2 Hawker Tempest Vs modified to use Napier designed annular radiators; also in experimental Vickers Warwick V.

Sabre VII

3,055 horsepower (2,278 kW). Mk VA strengthened to withstand high powers produced using Water/Methanol injection. Larger supercharger impeller.

Sabre VIII

3,000 horsepower (2,240 kW). Intended for Hawker Fury; tested in the Folland Fo.108.

Sabre E.118

(1941) Three-speed, two-stage supercharger, contra-rotating propeller; test flown in Fo.108.

Sabre E.122

(1946) 3,500 horsepower. Intended for Napier 500mph tailless fighter