guides:hydrogen_vs_helium_fro_hab
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| guides:hydrogen_vs_helium_fro_hab [2018/02/26 14:39] – [Helium:] rocketboy | guides:hydrogen_vs_helium_fro_hab [2018/02/26 14:41] (current) – [Helium:] rocketboy | ||
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| Pure Helium has a density of 0.1786Kg/cu m however balloon grade helium is usually only 97% Helium – giving it a density of 0.2094Kg/cu m. Air has a density of 1.225Kg/cum – giving: | Pure Helium has a density of 0.1786Kg/cu m however balloon grade helium is usually only 97% Helium – giving it a density of 0.2094Kg/cu m. Air has a density of 1.225Kg/cum – giving: | ||
| * **97% Helium** a lift of about 1.01Kg/cu m | * **97% Helium** a lift of about 1.01Kg/cu m | ||
| - | * **Hydrogen** a lift of about 1.13Kg/cu m – so about **12% better | + | * **Hydrogen** a lift of about 1.13Kg/cu m – so about **12% better**. |
| === Altitude difference. === | === Altitude difference. === | ||
| - | In practice the difference between Helium and Hydrogen is much less in terms of altitude attained. For example a 1Kg payload on a HY-1000 balloon at 5m/sec ascent rate would typically achieve around 32.0Km (105,000ft) on 97%Helium and 33.1Km (108,000ft) on Hydrogen – so **only 3% better.** | + | In practice the difference between Helium and Hydrogen is much less in terms of altitude attained. For example a 1Kg payload on a HY-1000 balloon at 5m/sec ascent rate would typically achieve around 32.0Km (105,000ft) on 97%Helium and 33.1Km (108,000ft) on Hydrogen – so only **3% better.** |
| === Difference in price: === | === Difference in price: === | ||
guides/hydrogen_vs_helium_fro_hab.1519655992.txt.gz · Last modified: 2018/02/26 14:39 by rocketboy