guides:hydrogen_vs_helium_fro_hab
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guides:hydrogen_vs_helium_fro_hab [2018/02/26 14:38] – [Helium:] rocketboy | guides:hydrogen_vs_helium_fro_hab [2018/02/26 14:41] (current) – [Helium:] rocketboy | ||
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=== Difference in lift: === | === Difference in lift: === | ||
Hydrogen has a density of about 0.0899Kg/cu m (at 1 atm 15C). | Hydrogen has a density of about 0.0899Kg/cu m (at 1 atm 15C). | ||
- | 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 | + | 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.1519655929.txt.gz · Last modified: 2018/02/26 14:38 by rocketboy