Airship

Limitations

   The relatively low rate compared with aircraft and helicopters (usually up to 160 km / h), low mobility - primarily because of the high aerodynamic drag during flight.

   The difficulty landing.

   Depending on weather conditions.

   Very large sizes required hangars (slipways), the complexity of storage and maintenance on the ground.

   The relatively high cost of servicing the airship, especially large sizes. Typically, for today's small airships require so-called wharf-front team, from 2 to 6 people. The U.S. military dirigibles 50-60-ies require the efforts of about 50 sailors for safe landing, and so after the sound of helicopters, they were retired.