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The TC Class of non-rigid airships was developed for the US Army in the early 1920's to meet a need for a medium sized advanced trainer. But the TC Class went far beyond the training mission to become the Army's most widespread type and was used in such diverse roles as coastal patrol duties and airplane hook-on experiments. They used helium gas for lift and the first of the type was delivered in 1923.
There were many individual variations among the class with for example, several engine types being used in both pusher and tractor configurations. There were also a number of different control car designs incuding open and closed cabins. However, the envelope volume of the TC's remained constant at 200,600 cu ft (5,680 cu m) right up until 1933 when the volume for the new TC13 and TC14, which were radical new designs overall, was increased to 349,000 cu ft (9,883 cu m.) These last two kept the "TC" designation because by that time, approval for trainers was easier to get through Congress than for patrol types.
Overall Length, TC-1 through to TC-12: 196ft (59.74 mtrs)
Envelope Diameter: 44.5ft (13.6 mtrs)
The model is 171mm long and 53mm high.
It is in two parts with a separate nose cone so that the hull can be cleaned after printing.
I have used the ballonet air scoops as the means of "connecting" the Control Car to the envelope. The propellors have to be shown as discs because in this scale they are too fine to be printed otherwise.
There is a nominal 2mm diameter in the hull just aft of the Control Car for a mounting rod or display stand.
The Control Car included is the open cockpit version with two V8 engines driving pusher propellers. This is correct for at least TC' s 4, 7 ,8 and 9.
"US Army Airships 1908-1942" by James R. Shock
published by: Atlantis Productions, Florida, USA,