The Bell 525's enhanced specifications include a flight cruise speed at max continuous power and max gross weight of 155+ kts (306 kph), a range of 500+ nm (926 km) and a useful load of 7,400+ lbs (3,357 kg). The maximum gross weight for the Relentless is 19,300+ lbs (8,754 kg). The Bell 525 Relentless can also perform CAT-A take offs and landings to and from a helipad at maximum gross weight on a hot day.
Based on continued engagement with the Customer Advisory Panel, Bell Helicopter has updated design features as well. Sponsons were added to the aft fuselage for retractable wheeled landing gear and internally-stowed floatation devices. The sponsons will provide a weight-efficient configuration for fuel-efficient, high-speed flight. In addition, a cross-sectional area of the tail boom was reduced to optimize payload and airframe lateral drag in sideward flight. Cowls and fairings above the cabin roof were modified for easy maintenance. With the input of pilots, the flight deck arrangement was slightly adjusted to further improve situational awareness.
Bell provides 525 Relentless program update | Helihub - the Helicopter Industry Data Source