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TYB

Bell 412EP US Park Police over DC. Tail number N11PP. Note altitude. He's not shy at 900 feet.

Design and development

Development began in the late 1970s with two Bell 212s being converted into 412 prototypes. An advanced four-blade main rotor with a smaller diameter replaced the 212's two-blade rotor. A Bell 412 prototype first flew in August 1979. The initial model was certified in January 1981 with deliveries commencing in the same month.[1]The 412 model was followed by the 412SP (Special Performance) version featuring larger fuel capacity, higher takeoff weight and optional seating arrangements. In 1991, the 412HP (High Performance) variant with improved transmission replaced the SP version in production.[1] The current production version, 412EP (Enhanced Performance), is equipped with a dual digital automatic flight control system. In 2013 Bell introduced the 412EPI which includes an electronic (Digital) engine control for a PT6T-9 engine upgrade, and a glass cockpit display system similar to the Bell model 429. Also featured is a Garmin touchscreen navigation system, and the BLR Strake and Fast Fin upgrades for improved hover performance.[2] Over 700 Model 412s (including 260 by AgustaWestland) have been built.[3]

Bell 412EP

Enhanced performance version with P&WC PT6T-3DF engines

Government operators

United States

Chicago Fire Department

Delaware State Police

Los Angeles City Fire Department

Los Angeles County Fire Department

Miami-Dade County Fire Department

New York City Police Department

Orange County Fire Authority

San Diego Fire Department

United States Park Police

Virginia State Police

General characteristics

Crew: one-two pilots

Capacity: up to 13 passengers, maximum external load of almost 6,614 lb (3,000 kg)[3]

Length: 56 ft 1 in (17.09 m) including rotors

Fuselage length: 43 ft (13 m)

Height: 15 ft 0 in (4.57 m)

Empty weight: 6,789 lb (3,079 kg)

Max takeoff weight: 11,900 lb (5,398 kg)

Powerplant: 1 × Pratt & Whitney Canada PT6T-3D Twin-Pac or PT6T-3DF Twin-Pac coupled turboshaft engine, 1,250 shp (930 kW)

900 shp (671 kW) single power section emergency power

Main rotor diameter: 46 ft 0 in (14.02 m)

Main rotor area: 1,662 sq ft (154.4 m2)

Blade sections: - root Boeing VR-7 ; tip Wortmann FX 71-H-080[53]

Performance

Maximum speed: 140 kn (160 mph, 260 km/h)

Cruise speed: 122 kn (140 mph, 226 km/h)

Range: 529 nmi (609 mi, 980 km)

Service ceiling: 20,000 ft (6,100 m)

Rate of climb: 1,350 ft/min (6.9 m/s)

Power/mass: 0.2663 hp/lb (0.4378 kW/kg)

https://en.wikipedia.org/wiki/Bell_412