4 ms·

Can an airship compensate for 60-75 tonnes of buoyancy change? Releasing helium sounds expensive.

by quesera 1y ago

SoftTalker 1y ago
You could load ballast (maybe water) as you unload the cargo.
Terr_ 1y ago
Looks like the ballpark of $100k per metric ton, definitely not something you want to vent if you can help it.
OkayPhysicist 1y ago
you don't need to vent it if you can compress it. 1 cubic meter of helium replaced with 1 cubic meter of air raises the weight of the craft by ~1.5 kg. That means we need to be able to reduce our helium volume by 50,000 m^3. If (optimistically) we can pressurize the helium to 2 atmospheres, then we only need a 100,000 m^3 envelope. Which is huge, but half the size of the Hindenburg. Realistically, we'd probably get worse compression than that, but it's within an order of magnitude of feasible.
- Terr_ 1y ago
  > If (optimistically) we can pressurize the helium to 2 atmospheres It's been a long time since my physics classes, but wouldn't the require 4864 megajoules of energy [0] while raising the temperature of the gas from something like 20C -> 113C? Spreading that energy-use over 15 minutes, maybe 5 megawatts dedicated to compression. [0] https://www.omnicalculator.com/physics/thermodynamic-processes https://www.omnicalculator.com/physics/thermodynamic-process...
  - Terr_ 1y ago
    P.S.: Same tool but this link that pre-fills the input boxes with numbers. https://www.omnicalculator.com/physics/thermodynamic-processes?calculatorResult=H4sIAAAAAAAAA9Vda3PaSBb9KxS1H2ZmY43UrWdqZqqIHzHY4AfGjrM15WpABtlSC%2BtBTFL579sCyUggpO6W8Ozmw5SRbp%2FT5%2Fbr3ivQ%2FGiaeGJhsx%2BgwGx%2B%2FNEcIXsU2uTD%2BBZ5Fhrapt9Djuk3P%2F6nOXft0DFB80MzMJ2Z6aEg9JYfsUT%2BM3hAY9IABdaIfLpLffr7Q3M0RXiSh7m7VQybopI2mSNgF4%2BtwHKxH%2FXewrMwyPzhuDbyHhzk%2B4IYfZ4jOyRCU9cbfzVEAjw2A3OUlh31bm0VcTlmgMYoQBEOueSOrLSfMqAE0PKPLH9mo4U5bn58RLZvRgi%2BjyZLR4cWudycH18evz52XtzxraYdTg9uFhePX4TE7ENzGjg2Mftj9lc3wm4sO%2ByEftAYmo2JZ5IOeI2AOLchCn%2F8Pvur%2BfPnT9KKXH8YoRkaWcFCkNK6M7eKpGcMqdRnW1A6wDkVw8OeeOZftszL89A%2FMF6HQa4DTgl8463n5T4YPZBpYrkCyMiPrxYqj23oRCfGlHqD4yt1Cp5FtXt6rshAu5aun2cUele9LlU98whStFQEmJb9drlI95sRlfC1NaVyu%2BNbnyYH2HOvgs75Nzg0Ry9PucrbmKxoZDcSCnrZUJDzZEMa2ZBJNqSVPZ50pzfX3%2BW5PHBmD9Npd3jVlWqWrQhKnmyFRrbCJFuhlW3NTm8c%2FDg%2BnWkvo2t54MktTaxZtiaoebI1Gtkak2yNVvbsIXyxraOnezOYPJ48ul%2FVs%2FC5Jtmr41cStLTo%2BGKR5NiESnBiSym3d%2Fvq9L%2BcOidfw87s%2Bnhy%2F03ttwvlrghoxUJB3xZbuJpjEwax1Cv5wQHfvKvTr9%2FaLThXZfHrvAWtGsUqgrEttnANxyYMYqnXr3173PM8tX3%2FEt4edPs3V4Nx%2B7RGsZogidtqC5dubMKglnrZPj7dnXb6WDs%2Bfl6cnV3ed9rdW7UWtenwVZAyoVj6VpHuTARMI34jZKbyQH8UnBzcDK%2B0z63z%2Fis%2Bc7qBelTogRQLkxugIIEdbihc2Wk7VjdQr%2FGjjtpfvLgtiOY9MHRsAB%2Ft%2FbhBESS4ww2Faz5tx%2BoG6tUPoHkvf7r7rA%2FCqYbg9PYV9%2BBe3ED2AXmHGwo3g7Qdqxuot4XpsGWNv3w6aZsveHZ%2F8Bqqry%2BL%2BtyQHP1AkHLjN0ATyACmQAbQSkf6Yb%2F13D%2B7vDg1Lxbnn2%2FdwVMrV%2FqJhbmiN1mQcsM3mUa1zKRaplWtd28HLwGU74%2FOpzdPw0en3RMPa1WtC5KWp1qnUa0zqdZpVcuqPAC6fdYJfAdP%2Fe%2BTe0vq1KI6rhgJUk4YVzi7k1IT%2FVlPPbPxSXA5bd1KU0kNQN%2B%2B7iwu55MCtWxxjSpIOVGcWq5VZdCq0mq9v7vstb7gm6duz2wtUO9GHjzn7%2BM8WnUB5MRwhTM5NmHQSj2LxYevJ7j7dOF8ee2dHYRwfD2W%2BzVoxZIAMnEbLozWMF2Mhqkjs6G7uD8avAazoYy%2BK7cePBiO89OOluOGOGi4j40JoqgSYiiATCSGC%2BMvTBd1YfrKSEsemnP%2Fs62ot96nz%2BibhVr5QTerMEUAmdgKF0ZUmC6OwtTRExKR2EZHY90cXbTdUHseH3i3tQjTBJCJlnBhjITpIiNMHQ89H02fUNs9ax1%2Bn4%2Btg3PZsPGoujCizA2DHQV7irp87I3AC0mnA8%2BaTEzPwpOkRfSsgfTq0nNHpKfN%2FPo4XQ2cnSlThS4tNzPjb9R7y%2Bu63AxxabW8hMrNEFcxy6uV3AxxwbC8MMjMkKnNlVXhONHjYlhZ2YsTPa4%2BldWZONGTck9ZYYcZPqe%2BQlVEqUKUVDCoyhRViJIaAVUhoApRkoVTpdrcyy%2FJc8vzWW6KJKksTx65KZIMrjxT41wrSbpUlhhxwicZSlkuwgmfJAVl4T8z%2FFscXhB2s4MmMXBByMsOmsSfBeEmO2gS%2BxWEeoygUeAVWpmvSwxtd%2FT82XPDmS8AwUEEhNgKojCKRg5Hfy1Hd2qNTb80ykioGn%2F%2B2ZAiETvgpXL47eOTFhyUg%2B84HGgZYDkD5sGV6b0Od8CDAniF1us84CqT13kYNAqv8%2BDq9F5XdsDDAniD1us84BLFQt0RN1BTUCxWzAVMsVDzgvQ0vlyET7FMtyNRanSKxbojkKKmoFiwmBoYcu3ugHYbgxy7Ow842%2B7Ow0AxbQbZLzsyElDMnLtKBBTz5qoSAcVmnxd7F%2B7IkGmnT40xDwPFnj94sHx3NHW9nR4qIqDY9e8qEdDs%2FFfVGKjXsUq7%2B0O23T81yFwUVCuZuGiIdnuokIBqJVchoFrJVQgYVrLOcdJIFEt5O0ekRqddxsHU9Bxk81DQLmR%2BCkC7kkspMnX1ejM7%2Bry1zpSvMit%2FLliZmjVJrEzImT3Gz34qEHPlldVp%2BTPO6tysuWh1Rs4stToxV%2F5anbZCZlsDOWvOWwMlZzZcAzNXnlwDL38GXQM5a27NSVk96%2BY7F6qm45VZ%2BfP0ytTcCXxlZu7MvjIzd8pfmZmzFlB9PfFXCapzc9cPqlNzVxaqU%2FPXHGrg5qpG1MDLX6eogZy3glEDNW9towZq3qpHDdSc9ZAamLkqJTXw8tdQaiDnr65UJ69Qd6EmXz5yH7l4bnq%2B5eIT13NCG%2FkRWfo4Jh%2FXRu3EjAD98otnPpqeiUfmbUT966%2FNNN5FGBTaEvLUQtk3S7zr75smGY498gyoxkYSl%2F9%2BY6GTfo9b%2FfrbLur3GK%2FB%2B4zX4J3G6%2B6fG6%2B7dxmvu%2FcZr7t3Gq91hblotCQIFObBihrtGqt1ev2P0ML3cKn8HiTKe5Bo70Gi75Mk82iBgafx74Yiq%2FB3IDIwNg6SRpvcRdN939wscz6FUrUXqfbZ%2FrAsj%2FfoD8tKeo%2F%2BqP9j%2FWHZBPbWn%2BTB5B63iqQCu3eKvR5CyYOgvVOwTFNOir0eP0kmvzeKKO0M%2FcB1Ov6x57lelM3%2Bnbr2OnO95XfKiX2UjhJ7k2AfFrwNMP1KgQpvBjRfAw8dxb9PtPzWeI5Ix9c%2FQrT8rju07HWWHfqmt3JUiANvceiOoxR70I8cEnqR7MXy81HqQn%2FhDN3op4n%2FivqE5tYEBa53jvAkRBPzBk3ILRMfLEEIfjvSYCF7gK3AT2riM2KZtIhJTbz07OPK9ZH1kTkz8Tii7KLZyo9RtSHPf0lR4EMm9d9IkrKh%2FofmBEUNMu8Z3HztXub1dQiHyG5H3%2B5fFhkSzo8%2Fll%2F8b%2FpPrd5pf4ZvzpT2V%2FnuWrMezu6WM8shTaL%2BRqYOCqZPpFHzkzXphc6Q%2BH%2F9lRNp6YKN6sUSXGQDEpdAmykiP9JGjsQPNEFrhzknQwM%2FT%2FTOpGPY1%2F2T6bWkHbGBwubP7ZSHxd2rH22s%2FsocRfQgyxR2jfT2MXPsrOFwaNuxbU7eRE0L3hhBfjhMj7TuPFgN0mqm17rK0m84XL8XLb3tbX5XaPVtqwtsLzJVQ%2BrlOk%2B23%2F%2BDhbpZSMybLdFfedXAMttMyaHAeKsuR61B1lVZ0kVVEgVR1qCk6pKoiFDVDQAA1BRNVA2gKlCCugR0w1BkTZZVTTOIKVQkY70Ma0HarPIVaqZ3Zp2bKa%2BnD%2BpzdT1QmxW6Av%2FVdoRsF9IKWPdy3rxtMwmyJKiqxriDLJtsvWB4DQkEWdclRtC40XITX2%2BUCaYsiCJQ2SDjNquXt7BuDJKiSUASyJlI5hSZThIAhgJ1WZV03VDIZ0lUgaRrwJCAJklQhFBRVTLxDJVMPclYbwx1IGFYOl2wUm6ilZpk4pE4KoiKmIyDuWrzczNIiE9qIotx%2BcRtMu%2F4pdYiU1uWu3CjCklhqZdabgZAKy8ZMPqZPJuXVm02Xq3HGp5BXRV0WTHIEIqGTqYj0ERDFWWJ7K46lKFq6BrZcRXZgBDIhiQCMkmhCnQRyGTGQv1t6teCtF01pHNl%2Bahv19vojFUW4%2FKJkord02E444Jbhe67Y%2FcSAFUxdFHQdQBlPfpTjk5VclaKokQOTqhKkFxUdCCTwQKGqMqibIgSMMjxqkQjtz6da0HKFKVKfVc%2BepnyUKkd7ZiVLe3VduXOrbHpvf2fFVAYuD6am3HlxbVtNPPNcXu8zBG6Yuf0y8vNKbzsDWbfvjrzHnxtRTnB1LRnN%2Bbr8jccmSgsLodc5VzLxC1vdtvX0qFQ2ix7KRu8pO2yF99qHe9V3fBNe%2FkmhGWZpm%2BHk2XYkDnJZp7lIC8qCPkBwmPkjR9Q4Lj%2BjPTA3Eig17YOzMtP1%2FcPtx7jre9dIn9EpGXncgH0xv2zredqu6GVEmilAForhtZKoLUCaMDgeFDCA3Icv5H1re92OzkP%2FzdvX%2B263dl6bJrnns2DZsMHG9nZBvpd4d2rwrupnazAX%2BquPr0lPHld2nXzquhmJs7ZPZP0vB5vJqZ5ndp9e7NGkLlN%2Fv0XX%2FE70tVmAAA%3D https://www.omnicalculator.com/physics/thermodynamic-process...
  - OkayPhysicist 1y ago
    Conceptually, since the airship is tethered to the ground during that compression, the power could be sourced from a ground tether as well. The problem would be the pressure vessel, which is why something like a 200,000 m3 1 atm helium going to 150,000 m3 1.33 atm would be more reasonable.

Can an airship compensate for 60-75 tonnes of buoyancy change? Releasing helium sounds expensive.

SoftTalker 1y ago

You could load ballast (maybe water) as you unload the cargo.

Terr_ 1y ago

Looks like the ballpark of $100k per metric ton, definitely not something you want to vent if you can help it.

OkayPhysicist 1y ago

you don't need to vent it if you can compress it. 1 cubic meter of helium replaced with 1 cubic meter of air raises the weight of the craft by ~1.5 kg. That means we need to be able to reduce our helium volume by 50,000 m^3. If (optimistically) we can pressurize the helium to 2 atmospheres, then we only need a 100,000 m^3 envelope. Which is huge, but half the size of the Hindenburg. Realistically, we'd probably get worse compression than that, but it's within an order of magnitude of feasible.

Terr_ 1y ago
> If (optimistically) we can pressurize the helium to 2 atmospheres It's been a long time since my physics classes, but wouldn't the require 4864 megajoules of energy [0] while raising the temperature of the gas from something like 20C -> 113C? Spreading that energy-use over 15 minutes, maybe 5 megawatts dedicated to compression. [0] https://www.omnicalculator.com/physics/thermodynamic-processes https://www.omnicalculator.com/physics/thermodynamic-process...
- Terr_ 1y ago
  P.S.: Same tool but this link that pre-fills the input boxes with numbers. https://www.omnicalculator.com/physics/thermodynamic-processes?calculatorResult=H4sIAAAAAAAAA9Vda3PaSBb9KxS1H2ZmY43UrWdqZqqIHzHY4AfGjrM15WpABtlSC%2BtBTFL579sCyUggpO6W8Ozmw5SRbp%2FT5%2Fbr3ivQ%2FGiaeGJhsx%2BgwGx%2B%2FNEcIXsU2uTD%2BBZ5Fhrapt9Djuk3P%2F6nOXft0DFB80MzMJ2Z6aEg9JYfsUT%2BM3hAY9IABdaIfLpLffr7Q3M0RXiSh7m7VQybopI2mSNgF4%2BtwHKxH%2FXewrMwyPzhuDbyHhzk%2B4IYfZ4jOyRCU9cbfzVEAjw2A3OUlh31bm0VcTlmgMYoQBEOueSOrLSfMqAE0PKPLH9mo4U5bn58RLZvRgi%2BjyZLR4cWudycH18evz52XtzxraYdTg9uFhePX4TE7ENzGjg2Mftj9lc3wm4sO%2ByEftAYmo2JZ5IOeI2AOLchCn%2F8Pvur%2BfPnT9KKXH8YoRkaWcFCkNK6M7eKpGcMqdRnW1A6wDkVw8OeeOZftszL89A%2FMF6HQa4DTgl8463n5T4YPZBpYrkCyMiPrxYqj23oRCfGlHqD4yt1Cp5FtXt6rshAu5aun2cUele9LlU98whStFQEmJb9drlI95sRlfC1NaVyu%2BNbnyYH2HOvgs75Nzg0Ry9PucrbmKxoZDcSCnrZUJDzZEMa2ZBJNqSVPZ50pzfX3%2BW5PHBmD9Npd3jVlWqWrQhKnmyFRrbCJFuhlW3NTm8c%2FDg%2BnWkvo2t54MktTaxZtiaoebI1Gtkak2yNVvbsIXyxraOnezOYPJ48ul%2FVs%2FC5Jtmr41cStLTo%2BGKR5NiESnBiSym3d%2Fvq9L%2BcOidfw87s%2Bnhy%2F03ttwvlrghoxUJB3xZbuJpjEwax1Cv5wQHfvKvTr9%2FaLThXZfHrvAWtGsUqgrEttnANxyYMYqnXr3173PM8tX3%2FEt4edPs3V4Nx%2B7RGsZogidtqC5dubMKglnrZPj7dnXb6WDs%2Bfl6cnV3ed9rdW7UWtenwVZAyoVj6VpHuTARMI34jZKbyQH8UnBzcDK%2B0z63z%2Fis%2Bc7qBelTogRQLkxugIIEdbihc2Wk7VjdQr%2FGjjtpfvLgtiOY9MHRsAB%2Ft%2FbhBESS4ww2Faz5tx%2BoG6tUPoHkvf7r7rA%2FCqYbg9PYV9%2BBe3ED2AXmHGwo3g7Qdqxuot4XpsGWNv3w6aZsveHZ%2F8Bqqry%2BL%2BtyQHP1AkHLjN0ATyACmQAbQSkf6Yb%2F13D%2B7vDg1Lxbnn2%2FdwVMrV%2FqJhbmiN1mQcsM3mUa1zKRaplWtd28HLwGU74%2FOpzdPw0en3RMPa1WtC5KWp1qnUa0zqdZpVcuqPAC6fdYJfAdP%2Fe%2BTe0vq1KI6rhgJUk4YVzi7k1IT%2FVlPPbPxSXA5bd1KU0kNQN%2B%2B7iwu55MCtWxxjSpIOVGcWq5VZdCq0mq9v7vstb7gm6duz2wtUO9GHjzn7%2BM8WnUB5MRwhTM5NmHQSj2LxYevJ7j7dOF8ee2dHYRwfD2W%2BzVoxZIAMnEbLozWMF2Mhqkjs6G7uD8avAazoYy%2BK7cePBiO89OOluOGOGi4j40JoqgSYiiATCSGC%2BMvTBd1YfrKSEsemnP%2Fs62ot96nz%2BibhVr5QTerMEUAmdgKF0ZUmC6OwtTRExKR2EZHY90cXbTdUHseH3i3tQjTBJCJlnBhjITpIiNMHQ89H02fUNs9ax1%2Bn4%2Btg3PZsPGoujCizA2DHQV7irp87I3AC0mnA8%2BaTEzPwpOkRfSsgfTq0nNHpKfN%2FPo4XQ2cnSlThS4tNzPjb9R7y%2Bu63AxxabW8hMrNEFcxy6uV3AxxwbC8MMjMkKnNlVXhONHjYlhZ2YsTPa4%2BldWZONGTck9ZYYcZPqe%2BQlVEqUKUVDCoyhRViJIaAVUhoApRkoVTpdrcyy%2FJc8vzWW6KJKksTx65KZIMrjxT41wrSbpUlhhxwicZSlkuwgmfJAVl4T8z%2FFscXhB2s4MmMXBByMsOmsSfBeEmO2gS%2BxWEeoygUeAVWpmvSwxtd%2FT82XPDmS8AwUEEhNgKojCKRg5Hfy1Hd2qNTb80ykioGn%2F%2B2ZAiETvgpXL47eOTFhyUg%2B84HGgZYDkD5sGV6b0Od8CDAniF1us84CqT13kYNAqv8%2BDq9F5XdsDDAniD1us84BLFQt0RN1BTUCxWzAVMsVDzgvQ0vlyET7FMtyNRanSKxbojkKKmoFiwmBoYcu3ugHYbgxy7Ow842%2B7Ow0AxbQbZLzsyElDMnLtKBBTz5qoSAcVmnxd7F%2B7IkGmnT40xDwPFnj94sHx3NHW9nR4qIqDY9e8qEdDs%2FFfVGKjXsUq7%2B0O23T81yFwUVCuZuGiIdnuokIBqJVchoFrJVQgYVrLOcdJIFEt5O0ekRqddxsHU9Bxk81DQLmR%2BCkC7kkspMnX1ejM7%2Bry1zpSvMit%2FLliZmjVJrEzImT3Gz34qEHPlldVp%2BTPO6tysuWh1Rs4stToxV%2F5anbZCZlsDOWvOWwMlZzZcAzNXnlwDL38GXQM5a27NSVk96%2BY7F6qm45VZ%2BfP0ytTcCXxlZu7MvjIzd8pfmZmzFlB9PfFXCapzc9cPqlNzVxaqU%2FPXHGrg5qpG1MDLX6eogZy3glEDNW9towZq3qpHDdSc9ZAamLkqJTXw8tdQaiDnr65UJ69Qd6EmXz5yH7l4bnq%2B5eIT13NCG%2FkRWfo4Jh%2FXRu3EjAD98otnPpqeiUfmbUT966%2FNNN5FGBTaEvLUQtk3S7zr75smGY498gyoxkYSl%2F9%2BY6GTfo9b%2FfrbLur3GK%2FB%2B4zX4J3G6%2B6fG6%2B7dxmvu%2FcZr7t3Gq91hblotCQIFObBihrtGqt1ev2P0ML3cKn8HiTKe5Bo70Gi75Mk82iBgafx74Yiq%2FB3IDIwNg6SRpvcRdN939wscz6FUrUXqfbZ%2FrAsj%2FfoD8tKeo%2F%2BqP9j%2FWHZBPbWn%2BTB5B63iqQCu3eKvR5CyYOgvVOwTFNOir0eP0kmvzeKKO0M%2FcB1Ov6x57lelM3%2Bnbr2OnO95XfKiX2UjhJ7k2AfFrwNMP1KgQpvBjRfAw8dxb9PtPzWeI5Ix9c%2FQrT8rju07HWWHfqmt3JUiANvceiOoxR70I8cEnqR7MXy81HqQn%2FhDN3op4n%2FivqE5tYEBa53jvAkRBPzBk3ILRMfLEEIfjvSYCF7gK3AT2riM2KZtIhJTbz07OPK9ZH1kTkz8Tii7KLZyo9RtSHPf0lR4EMm9d9IkrKh%2FofmBEUNMu8Z3HztXub1dQiHyG5H3%2B5fFhkSzo8%2Fll%2F8b%2FpPrd5pf4ZvzpT2V%2FnuWrMezu6WM8shTaL%2BRqYOCqZPpFHzkzXphc6Q%2BH%2F9lRNp6YKN6sUSXGQDEpdAmykiP9JGjsQPNEFrhzknQwM%2FT%2FTOpGPY1%2F2T6bWkHbGBwubP7ZSHxd2rH22s%2FsocRfQgyxR2jfT2MXPsrOFwaNuxbU7eRE0L3hhBfjhMj7TuPFgN0mqm17rK0m84XL8XLb3tbX5XaPVtqwtsLzJVQ%2BrlOk%2B23%2F%2BDhbpZSMybLdFfedXAMttMyaHAeKsuR61B1lVZ0kVVEgVR1qCk6pKoiFDVDQAA1BRNVA2gKlCCugR0w1BkTZZVTTOIKVQkY70Ma0HarPIVaqZ3Zp2bKa%2BnD%2BpzdT1QmxW6Av%2FVdoRsF9IKWPdy3rxtMwmyJKiqxriDLJtsvWB4DQkEWdclRtC40XITX2%2BUCaYsiCJQ2SDjNquXt7BuDJKiSUASyJlI5hSZThIAhgJ1WZV03VDIZ0lUgaRrwJCAJklQhFBRVTLxDJVMPclYbwx1IGFYOl2wUm6ilZpk4pE4KoiKmIyDuWrzczNIiE9qIotx%2BcRtMu%2F4pdYiU1uWu3CjCklhqZdabgZAKy8ZMPqZPJuXVm02Xq3HGp5BXRV0WTHIEIqGTqYj0ERDFWWJ7K46lKFq6BrZcRXZgBDIhiQCMkmhCnQRyGTGQv1t6teCtF01pHNl%2Bahv19vojFUW4%2FKJkord02E444Jbhe67Y%2FcSAFUxdFHQdQBlPfpTjk5VclaKokQOTqhKkFxUdCCTwQKGqMqibIgSMMjxqkQjtz6da0HKFKVKfVc%2BepnyUKkd7ZiVLe3VduXOrbHpvf2fFVAYuD6am3HlxbVtNPPNcXu8zBG6Yuf0y8vNKbzsDWbfvjrzHnxtRTnB1LRnN%2Bbr8jccmSgsLodc5VzLxC1vdtvX0qFQ2ix7KRu8pO2yF99qHe9V3fBNe%2FkmhGWZpm%2BHk2XYkDnJZp7lIC8qCPkBwmPkjR9Q4Lj%2BjPTA3Eig17YOzMtP1%2FcPtx7jre9dIn9EpGXncgH0xv2zredqu6GVEmilAForhtZKoLUCaMDgeFDCA3Icv5H1re92OzkP%2FzdvX%2B263dl6bJrnns2DZsMHG9nZBvpd4d2rwrupnazAX%2BquPr0lPHld2nXzquhmJs7ZPZP0vB5vJqZ5ndp9e7NGkLlN%2Fv0XX%2FE70tVmAAA%3D https://www.omnicalculator.com/physics/thermodynamic-process...
- OkayPhysicist 1y ago
  Conceptually, since the airship is tethered to the ground during that compression, the power could be sourced from a ground tether as well. The problem would be the pressure vessel, which is why something like a 200,000 m3 1 atm helium going to 150,000 m3 1.33 atm would be more reasonable.