3 ms·

Giant hot air balloon for lift + 4 rotors for steering? It wouldn't be fast, but it might work [in low wind conditions].

• mhb 4mo ago
  Rules exclude that approach.
• echoangle 4mo ago
  https://www.darpa.mil/research/challenges/lift/rules https://www.darpa.mil/research/challenges/lift/rules Forbidden in 3.7