Airspeed Indicator, Sensitive, 700 Knots, Army Type F-1A, US Army Air Force, WWII F7F Tigercat When the wheels are retracted

When the wheels are retracted

and is not visible in the photo

and therefore can only share what we can physically examine

We have not found documentation of its use

The left knob adjusts the indexing 'aircraft' within the dial to align the perspective of the pilot to the horizon indicator

Airspeed Indicator, Sensitive, 700 Knots, Army Type F-1A, US Army Air Force, WWII F7F Tigercat When the wheels are retractedThe Army Type F 1A Airspeed Indicator was used across a number of US Army Air Corps and Air Force aircraft during WWII, including heavy bombers B 17, B 24, B 29, medium bombers B 25 and B 26, as well as light bomber A 20, according to the Accessories Interchangeability Chart dated Feb 1945. It was also used in versions of US Army Air Force WWII fighters P 38, P 39, P 40, P 47, and P 51. This F 1A was made by Kollsman, part number 739BU 03, and has a