Research Article
Conceptual Design of a Small Hybrid Unmanned Aircraft System
Table 7
Lifting properties of He in standard (ISA) operating conditions.
| | Pressure altitude | Air or helium temperature
| Helium expected gross static lift
kg per kg of He | Helium density | Air density |
| | 7 | 17.1045 | 6.78 | 0.1681 | 1.2241 | | 10 | 17.0850 | 6.78 | 0.1681 | 1.2238 | | 13 | 17.0655 | 6.78 | 0.1681 | 1.2234 | | 16 | 17.0460 | 6.78 | 0.1682 | 1.2231 | | 19 | 17.0265 | 6.78 | 0.1682 | 1.2227 |
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