US 12,187,404 B2
Variable density airship lift chamber system
David Munson, Jr., Dallas, TX (US); and David Shawn Flatt, Forney, TX (US)
Assigned to FOI Group, LLC, Dallas, TX (US)
Filed by FOI GROUP, LLC, Dallas, TX (US)
Filed on Feb. 17, 2023, as Appl. No. 18/111,232.
Claims priority of provisional application 63/312,479, filed on Feb. 22, 2022.
Prior Publication US 2023/0264800 A1, Aug. 24, 2023
Int. Cl. B64B 1/62 (2006.01); B64B 1/22 (2006.01)
CPC B64B 1/62 (2013.01) [B64B 1/22 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An airship lift chamber system for an airship, comprising:
at least one lift chamber filled with lift gas and configured to provide lifting force;
a heat exchanger configured to:
receive the lift gas through a first gas line directly connected to the at least one lift chamber;
heat the lift gas in the at least one lift chamber; and
return the heated lift gas through a second gas line directly connected to the at least one lift chamber;
a compressor configured to withdraw the lift gas from the lift chamber and to compress the withdrawn lift gas;
a pressure tank configured to store the compressed lift gas from the compressor;
a refrigeration orifice formed in the lift chamber; and
a valve that connects the pressure tank to lift chamber through the refrigeration orifice.