Hybrid Hopes: An Inside Look At The Airlander 10 Airship | Technology content from Aviation Week
This does have some details I've not seen before e.g.:
The vehicle is a pressure-stabilized structure and "gets all its strength from being inflated to just above atmospheric pressure with a 4-in. water gauge pressure differential (about 0.15 psi),” says HAV Technical Director Mike Durham. Despite the relatively small amount of pressure, the strength is derived from the airship’s huge diameter. “It acts as a pressure vessel and creates a skin tension in the hull because of the internal pressure.” Skin tension is a function of pressure multiplied by radius. “We have little pressure but lots of radius. I can walk along the top of the hull and I sink in just 0.5 in., so it’s a very stiff structure,” Durham adds.
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Without an internal structural framework, how can the pressure vessel support tons of equipment and payloads of up to 7,000 lb.? “The payload module has pickup points on every single frame,” explains Durham. “We have a cable that runs up and punches into the interior of the hull, which is a figure-8 shape with a septum diaphragm in the middle. The payload sits in a cleft underneath. The cables come up on either side of the diaphragm to which large patches are bonded. All the loads are fed into that 300-ft.-long central diaphragm from where they are distributed out along the top surface,” he adds.
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