Mark Allen M wrote:... I can only guess they are some sort of radar / sonar type ideas? Photos stated nothing to explain the when's, where's, why's or what's.

From Air Enthusiast 13 (Aug-Nov 1980) Letters page reply to earlier article on Project Tom-Tom: Jay Miller quoted a letter from Dr Richard Vogt, a German designer with Blohm und Voss: Vogt had made various tip-tow proposals to the USAF, including B-29/F-84, C-47/PQ-14, and:
"...I designed small fuel-carrying wings for the Beech L-23. Beech received an order to build and attach them and to make necessary flight tests. All was completed very successfully and a range increase of more than 100% was achieved. We also made flights with only one floating panel attached without problems".
From his letter this would seem to have occurred sometime in 1955 or earlier, but the FY55 s/n of the L-23 would probably mean a post-55 date.