The Thermoplan is a given name of the prototype of Russian lenticular-shaped hybrid airship. == Design features == The key feature of Thermoplan is its combined structure with primary section having a torus of revolution shape (one variant was to construct this section hermetic and fill with helium instead of the shell helium section).
The Thermoplan is a given name of the prototype of Russian lenticular-shaped hybrid airship. == Design features == The key feature of Thermoplan is its combined structure with primary section having a torus of revolution shape (one variant was to construct this section hermetic and fill with helium instead of the shell helium section).
Source: Wikipedia "Thermoplan" · CC BY-SA 4.0
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