guides:hydrogen_vs_helium_fro_hab
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guides:hydrogen_vs_helium_fro_hab [2018/02/26 14:16] – [Helium:] rocketboy | guides:hydrogen_vs_helium_fro_hab [2018/02/26 14:41] (current) – [Helium:] rocketboy | ||
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====== Hydrogen vs Helium as a lifting gas for HAB ====== | ====== Hydrogen vs Helium as a lifting gas for HAB ====== | ||
+ | |||
+ | The following is written as information only. The following in no way constitutes any form of accurate legal advice. If you choose to use Hydrogen the onus is on you to research the implications and take appropriate safety measures both for yourself personally and the general public. | ||
===== Hydrogen: ===== | ===== Hydrogen: ===== | ||
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* **cons:** Highly Flammable, needs a registered business to acquire, extra precautions needed. | * **cons:** Highly Flammable, needs a registered business to acquire, extra precautions needed. | ||
- | ==== Helium: ==== | + | ===== Helium: |
* **pros:** Non flammable, available retail. | * **pros:** Non flammable, available retail. | ||
* **cons:** limited natural resource. | * **cons:** limited natural resource. | ||
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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: === | ||
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Both of the above are lightweight (25Kg) cylinders that can be easily maneuvered. | Both of the above are lightweight (25Kg) cylinders that can be easily maneuvered. | ||
+ | |||
+ | Prices from early 2018 | ||
=== Hydrogen Flammability === | === Hydrogen Flammability === | ||
The most likely cause of ignition for HAB use is probably a static discharge between the filled balloon and personnel or structures. | The most likely cause of ignition for HAB use is probably a static discharge between the filled balloon and personnel or structures. | ||
+ | |||
+ | Also see [[guides: | ||
guides/hydrogen_vs_helium_fro_hab.1519654581.txt.gz · Last modified: 2018/02/26 14:16 by rocketboy