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Bell Model 525 Relentless

United States (2019)

Detailing the development and operational history of the Bell Model 525 Relentless Medium-Lift Passenger Helicopter.

 Entry last updated on 2/23/2018; Authored by Staff Writer; Content ©

  Bell Model 525 Relentless  
Picture of Bell Model 525 Relentless Medium-Lift Passenger Helicopter

The Bell Model 525 medium-lift helicopter is expecting a first flight sometime during 2014.

The Bell 525 "Relentless" is a new Bell Helicopter offering for the medium-lift commercial market. The model is currently in development as of this writing (2013) with a first flight expected sometime in 2014. The Model 525 was debuted in 2012 at the Heli Expo (Dallas), utilizing many previous learned advantages in rotary-wing flight from the storied company. The Model 525 is expected to make heavy use of composite materials to promote a lightweight, yet strong, airframe. Additionally, its use of digital fly-by-wire controls will make it the first commercial-level helicopter product to be completed as such. The aircraft is geared primarily at customers seeking a modern VIP transport. The Model 525 will utilized a crew of two with up to 16 passengers.

Power for the Model 525 series will stem from a pairing of General Electric CT7-2F1 turboshaft engines developing 1,800 horsepower while driving a five-bladed main rotor and a four-bladed tail rotor (facing portside. Maximum speed is estimated at 160 miles per hour with a service range of 460 miles and a service ceiling of 20,000 feet. Bell lists a max gross weight of 19,300lbs (8,754kg) with a useful load weight of 7,400lbs (3,357kg).

Outwardly, the Model 525 will exhibit a very impressive design approach with clean lines throughout while remaining a largely conventional system. The cockpit for the two pilots is held at front aft of a short nose section. Aft of the cockpit will be the passenger cabin lined with rectangular windows. The engines will be fitted to the cabin roof, matching the contours of the airframe, with the systems exhausted via ports to either side of the aft fuselage. The empennage will be traditional, featuring a single vertical tail fin. The undercarriage is of a tricycle arrangement featuring two single-wheeled main legs and a twin-wheeled nose leg while being wholly retractable to preserve aerodynamic and fuel efficiency. The cockpit will be streamlined and highly advanced through various onboard digital suites. Both positions will have access to side stick cyclic/collective controls while four 12-inch touchscreen displays will dominate the instrument panel. Avionics includes the Garmin G5000H suite.

The Model 525 is expected to compete directly with the Sikorsky S92 as well as the AgustaWestland AW139 series. Beyond its obvious targeting to corporations, Bell also intends to market their Model 525 to offshore oil refinery firms, firefighting departments, MEDEVAC and the United States Coast Guard.
PHI, Incorporated of Lafayette, Louisiana is the Model 525's launch customer. PHI, Incorporated served as a rotary-wing transport concern servicing the oil and gas, mining, technical and medical industries.

July 2015 - It was revealed that Bell had completed a first-flight of its Model 525 product. This event was originally scheduled for late-2014 showing the delay in its development.

July 2016 - The prototype Model 525 crashed, killing its two pilots, on July 6th, 2016. In August the NTSB reported that the main rotor blades had hit both the nose and tail units of the helicopter during its high-speed simulated engine-out test.

January 2018 - Investigators have concluded that the Model 525 crash (see earlier note) was related to the helicopter's Fly-by-wire (FbW) system.

February 2018 - The Model 525 is expected to enter the market in early-2019.
Bell Model 525 Relentless Specifications
National Flag Graphic
United States
Year: 2019
Status: In-Development
Type: Medium-Lift Passenger Helicopter
Manufacturer(s): Bell Helicopter - USA
Production: 3
Supported Mission Types
Ground Attack
Close-Air Support
Airborne Early Warning
Electronic Warfare
Aerial Tanker
Passenger Industry
VIP Travel
Business Travel
Special Forces
Crew: 2
Width: 54.46 ft (16.60 m)
MTOW: 18,001 lb (8,165 kg)

Installed Power
2 x General Electric CT7-2F1 turboshaft engines developing 1,800 shaft horsepower and driving a five-bladed main rotor and four-bladed tail rotor.

Standard Day Performance
Maximum Speed: 162 mph (260 kph; 140 kts)
Maximum Range: 460 mi (740 km; 400 nm)
Service Ceiling: 19,685 ft (6,000 m; 3.73 mi)


Operators List
United States (probable)

Series Model Variants
• Model 525 "Relentless" - Base Series Designation