Airspeed Indicator 450+ Knots Mk 9L Ref 6A/4721 RAF KC-97

Airspeed Indicator 450+ Knots Mk 9L Ref 6A/4721 RAF KC-97This is an excellent example of a post WWII era Air Speed Indicator Mark 9L, Ref 6A 4721, as used in the British RAF fighters Supermarine Spitfire and Seafire. Air speed from 0 270 Knots is indicated by a clockwise rotating pointer, starting at the 6 o'clock position, along the outer perimeter scale. As the aircraft passes 270 Knots, air speed is indicated along the inner scale up to 450 Knots, with gradations up to 500 Knots. The indicator measures

See photo of the instrument in the 1959 Collins Radio catalog page

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000 of these instruments were made at the A

an amplifier and a master indicator located at the navigator's position

This pocket-sized 97-page WWII manual was specifically prepared to acquaint those servicemen who were transferring from the European theater to the Pacific theater with the aircraft and naval craft that they would not have encountered in Europe

In very nice condition for its age

The knob at the top of the indicator is actually a hex key used to adjust deviations in readings on the Master Compass

This is a late WWII-era Wheel and Flap Position Indicator

The coating on the power cord is separated in 3 places

B-25 Mitchell

When electrically powered and in-flight

which pioneered the way for future designs of aerial refueling aircraft