Spotlights - Low Altitude Flying Modification

A general arrangement drawing below, shows the spotlights used to judge the height of the aircraft. When the two beams met on the surface the aircraft was at 60 feet.

DC72/28

This modification was designed by Benjamin Lockspeiser, the Deputy Director of Scientific Research at the Ministry of Aircraft Production, who recalled a proposed system to find inshore submarines using aircraft fitted with searchlights. The fitting of the lights was made necessary after the special low-level altimeter developed by EMI was found to be unreliable.