The CL-227 Sentinel is a highly regarded part of the NATO inventory, and is regularly used on military exercises in the United Kingdom and elsewhere, day or night. Bombardier's Canadair Defence Systems Division produced an early version called the Peanut as far back as 1978.

The CL-227 is a remotely controlled helicopter with a turbine engine driving a pair of co-axial counter-rotating rotors. A successful naval develoment was completed to demonstration stage in 1992.

The Sentinel is roughly 1.8m tall, standing on four castered legs. Support vehicles include a flatbed pickup transporter with winch and launch platform, and a control / communication van, each with utility trailers. The Sentinel has also been deployed on USS Doyle for Arctic trials, operating from the helicopter deck.

unrealaircraft.com

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Technical data for CL-227

Rotor diameter: 2.54m, take-off weight: 190kg, speed: 130km/h, ceiling: 3000m