Flying crewed aircraft for costal patrol/surveillance is not cost effective nor particularly efficient with current UAV camera technology, and planned future air to air refuelling capability.
The MQ-9 Reaper (originally the RQ-9 Predator B) is used by the USAF, USN and the British RAF. The MQ-9 is a purpose-designed hunter-killer UAV designed for long-endurance, high-altitude surveillance. This makes it ideal for costal patrol as well as deployments in theatre, and a single fleet is cost effective in terms of vehicle pricing, parts replacement and training programs for pilots and maintainers. The general characteristics of the Reaper show that it is more than up to the task and a bargain at a cost of about 8 million US apiece.
The Airship idea is good, but could not be used as a weapons platform in theatre, or retrofitted for ASW work, as could a UAV/TUAV.
Ceiling: 50,000 ft (15 km)
Endurance: 15 h
Range: 3682 mi (3200 nautical miles)
Fuel Capacity: 1,300 kg (3,907 lb)
Length: 11 m (36 ft)
Payload: 1700 kg (3800 lb)
Weight: 1676 kg (3700 lb) empty; 4760 kg (10,500 lb) max
Wingspan: 20 m (66 ft)
Velocity: 400 km/h (250 mph, 220 knots)
