Used to test flying boat hull designs, which would be fitted like slip-on shoes. Undercarriage modified to retract under the wing instead of into fuselage. The test hull in the photo is a scale version of the P5M Marlin. Auxiliary fins added to compensate for longer hull. At least four different hull designs tested between 1948 and 1953. 32976 is preserved at Pima Air Museum with a different hull to the one in the photo and without the auxiliary fins. Photo from: National Archives at College Park, Maryland
This photo was added on 26 December 2022, and has since been viewed 346 times.