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The Goodyear Aircraft Company of Akron, Ohio built the M-class blimp for the US Navy as the follow-on to the K-class anti-submarine warfare blimp used during World War II. It was a significantly larger airship. Four airships, designated M-1 through M-4, were delivered in early 1944. Operations of K-ships in tropical regions had shown a need for a blimp with greater volume to offset the loss of lift due to high ambient temperatures.
A contract was awarded to the Goodyear Aircraft Company for the prototype M-class blimp on August 16, 1943. This contract was followed by another contract on September 11, 1943 for 21 M-class blimps. These airships were given the Navy designation of ZNP-M, (Z = lighter-than-air; N = non-rigid; P = patrol; M = type/class.) However, on November 22, 1944, the quantity of blimps was reduced to four. These were delivered to the Navy in February, March, and April 1944. The M-Class airships were retired from service by 1956. The gondola of the M-4 was remained in the conservation area at Lakehurst until the mid-1970s,
The M-class blimps were three hundred and ten feet (94.49 m) long with a 117 foot (35.66 m) long control car. In order to maintain the proper loading on the catenary, the control car was built in three sections with universal joints between the sections. The catenary is the webbing internal to the envelope from which the control car is hung from the top of the envelope. Control of the weight distribution from the catenary is necessary to control wrinkling of the envelope. The capacity of the envelope of the M-1 was 625,000 cu ft (17,698 m³) with an increase in capacity to 647,000 cu ft (18,321 m³) for M-2 through M-4. These airships were powered by two Pratt & Whitney radial air-cooled engines.
Originally posted by oLDWoRLDDiSoRDeR
Mud on a window. And or spots that got on the picture after it was developed ..
“We were out for the 4th of July celebration that day when we saw cars in front of us slowing down and looking out their window. Joan (2 year-old daughter) was in the back seat and Mary (wife) was sitting beside me. I remember Mary gasping for air as if she spotted a ghost. It scared me, so I slowed down and asked her what was the matter. She said, “Look!” I looked in the direction she was pointing and was amazed at what I saw. There were several objects flying over the vicinity of the Pentagon. We had not seen many aircraft at all that 4th of July so even if they had been earthly aircraft I would have been surprised. But they weren’t! They were shaped different than anything I had seen flying in the area. They had the ability to slow down and speed up like no aircraft the Air Force had. I quickly told Mary to get my camera out of her purse, where she had been carrying it during our picnic on the mall in DC that day. The camera took great color pictures you know."