Disk Speed Indicator Mk XV for use with Norden Sight Eurofighter Typhoon PV-1 Ventura and PV-2 Harpoon

PV-1 Ventura and PV-2 Harpoon

but perhaps not surprising for an artifact of its age

5 inches long with ~6 inch wingspan

but requires the correct electrical input to function properly

Disk Speed Indicator Mk XV for use with Norden Sight Eurofighter Typhoon PV-1 Ventura and PV-2 HarpoonThe Disk Speed Indicator Mk XV was used by WWII US Army Air Force and Navy bombardiers to verify and calibrate the disk speed of the Norden Bomb Sight during flight before initiating the bomb run. The disk speed is the parameter which determined the duration of flight between sighting of the target and automatic release of the aircraft's ordnance. With the bomb sight switched on, the bombardier would affix the top axle to the small female receptacle