| ▲ | xnx 10 hours ago | |
Giant hot air balloon for lift + 4 rotors for steering? It wouldn't be fast, but it might work [in low wind conditions]. | ||
| ▲ | echoangle 2 hours ago | parent | next [-] | |
https://www.darpa.mil/research/challenges/lift/rules Forbidden in 3.7 | ||
| ▲ | mhb 6 hours ago | parent | prev [-] | |
Rules exclude that approach. | ||