Worldwide militaries have been developing large capacity rotorcraft UAVs for more than a decade. Notable products include Kaman’s uncrewed K-Max, which saw action in Afghanistan beginning in 2011 (Kaman actually first flew an uncrewed helicopter in 1953 as part of a U.S. Navy demonstration project); Bell’s MQ-8C Fire Scout (based on the model 407); Airbus’s VRS700 (based on the Guimbal Cabri); Leonardo’s SW-4 and Proteus (derived from the AW09); and Sikorsky’s incorporation of Matrix technologies into Black Hawk and S-76 demonstration aircraft.
But the development of, and the market for, large civil rotorcraft UAS remains in its nascent stage, with some manufacturers opting to utilize existing crewed rotorcraft while others opt for either a custom design or the time-tested quadcopter architecture. However, recent developments, including the impending adoption of the Federal Aviation Administration’s (FAA’s) part 108 beyond visual line of sight (BVLOS) rules, are expected to hasten the arrival of these aircraft into the marketplace.
In March, U.S. Department of Transportation Secretary Sean Duffy said the part 108 Notice of Proposed Rulemaking (NPRM) would be issued in “relatively short order” and the FAA has said it remains committed to having a final rule in place by early next year. In the meantime, here are some of the large commercial rotorcraft UAS that are emerging.
Rotor Technologies R550
New Hampshire-based Rotor Technologies (RT) is fielding two aircraft which are variants of uncrewed piston-engine Robinson R44 helicopters; the heavy-lift R550 Air Truck and the R550 Sprayhawk for agricultural spraying. RT offers conversion kits for pre-owned helicopters and is exploring with Robinson the possibility to offer the technology on new-build helicopters at some point in the future.
CEO Hector Xu said using the existing Robinson airframe offers a plethora of competitive advantages including cost-effectiveness, a large installed customer base, and a mature service and dealer network. Xu thinks that eventually new-build R550s will be price competitive with crewed versions of the R44 and that RT’s fly-by-wire technology could eventually be marketed along the lines of Garmin’s avionics as it is airframe agnostic. Xu stressed that the R550s are not pilot optional technology and operate within the same parameters of other large UAS, visual line of sight with a pilot and a visual observer. However, the aircraft are beyond visual line of sight (BVLOS) capable with the appropriate regulatory approvals.
Removing the onboard pilot and associated controls from the aircraft translates into a net gain of 150 pounds (68 kilograms) of useful load. Both versions of the aircraft have a useful load of more than 1,000 lb. (450 kg) and the Sprayhawk can carry 110 US gallons (415 liters) of agricultural application. Operating range is 50 miles/80 kilometers (with BVLOS approval) and endurance is 50 minutes. Xu says the platform’s missions could be expanded to include intelligence, surveillance and reconnaissance (ISR); forestry management; and highly targeted night firefighting.
“Your payload is 1,000 pounds, and that sounds like a lot, but it is only about 150 gallons of water,” he said.
The conversion comes with a ground control station and a trailer and is typically operated by a crew of two that includes the remote pilot. A two-position ground station facilitates training and payload operations. The system generates a large amount of aircraft information that can be used for flight data monitoring and health and usage monitoring systems.
Built-in features also include terrain following, synthetic vision and head up display. Up to five simultaneous HD cameras and two lidar sensors streamed in real time to a remote operator for 360-degree situational awareness in all visibility conditions. The system supports up to seven simultaneous comms links including line-of-sight radios, cellular connectivity, and long-range satellite communications.
Customer preference for the Air Truck or Sprayhawk varies by market. The conversions sell for $375,000 and $525,000, respectively. The kits have received FAA experimental certificates in the U.S. and commercial approval in Brazil. Other approvals are in the works.
Kaman/Piasecki Kargo
In 2023, Kaman announced that it was halting production of its crewed and uncrewed versions of its K-Max heavy-lift helicopter. However, it did not exit the rotorcraft market, continuing to develop its Kargo quadcopter medium-lift UAS for both the military and civil markets. In April 2025, Piasecki Aircraft Corporation purchased the Kargo program, expanding its portfolio of vertical lift and cargo UAS solutions.
The Kargo is capable of transporting up to 800 lb. (360 kg) and flying up to 500 miles (800 kilometers). Its range is 143 nm (260 km) with a 600-lb. (270-kg) payload. Designed to fit inside a standard 20-foot (six-meter) commercial shipping container and to be deployed by a crew of two in just minutes, the Kargo leverages autonomous technology developed for the K-Max Titan uncrewed helicopter.
The vehicle can be utilized for a variety of missions including offshore oil-and-gas support and infrastructure inspections, search-and-rescue, delivery, agricultural application, construction, law enforcement, firefighting, and environmental monitoring. Kargo is designed to transport loads either in its conformal pod or via external sling load configuration.
In early 2023, offshore helicopter services company PHI signed an agreement to promote, sell, and support the Kargo. The deal included a non-binding memorandum of understanding for PHI to acquire up to 50 of the aircraft.
Kaman teamed with Textron Systems and Near Earth Autonomy to develop the vehicle and bring it to market. Near Earth is providing obstacle avoidance and other technologies such as precision landing, sense and avoid, and navigation in a GPS-denied environment and collaborated with Kaman on the uncrewed K-Max programs.
The aircraft is powered by a single Rolls-Royce RR300 (300 shp) turbine engine. The total span of the prop rotor area is 24 feet (7.3 meters) with rotor arms unfolded, and the vehicle weighs 2,800 lb. (1,270 kg). Top speed is 120 knots, and its service ceiling is above 10,000 feet (3,050 meters), with a maximum endurance of nearly five hours. Kargo made its first flight in late 2023 and could be available as early as next year.
Schiebel S-300
The Schiebel S-300 is a much larger under-development derivative of the time-tested S-100 Camcopter. Roughly three times the size of the S-100, the S-300 is being designed for a maximum payload of up to 550 lb. (250 kg) and a maximum takeoff weight equivalent to a light single-engine airplane or 1,400 lb. (635 kg). Its maximum speed is 120 knots and endurance is up to 24 hours when equipped with a camera and Inverse Synthetic Aperture Radar (ISAR), or six hours when fitted with a 550-lb. payload.
While initial customers are expected to be various military organizations, primarily as an anti-submarine warfare platform, like the S-100 before it, the S-300 will have a variety of civil and parapublic applications. Similar to the Kargo, the S-300 is designed to fit into a standard 20-foot shipping container, albeit when its three-bladed main rotor system is folded. It uses the same ground control station and payload attachments as the S-100.
Developed two decades ago, the two-bladed S-100 has been an unqualified success, building a long list of both military and parapublic customers. It became available with a diesel engine in 2012 and is available with a variety of payload packages, mainly for ISR duties. They include the Thales I-Master surveillance radar and the L3 Wescam MX-10 electro-optical infrared camera system. Altogether some 20 militaries and 15 parapublic agencies employ the aircraft on a diverse mission set.
Its range is 97 nm (180 km), endurance is up to six hours, and the service ceiling is 18,000 feet (5,485 meters). The UAE was the launch customer in 2005.
The S-300 already has been selected by several militaries including the South Korean Ministry of Defense (MOD). In 2024, Schiebel and Korea’s Hanwa Systems and UI Helicopter were awarded a contract to supply the S-300 for Intelligence, Surveillance, Target Acquisition and Reconnaissance (ISTAR) missions for the South Korean Navy and Marine Corps. Earlier this year, the S-300 was chosen by Europe’s SEACURE Consortium of companies and countries to provide uncrewed anti-submarine and seabed warfare solutions.
Phenix Solutions Ultra 2XL
Powered by the Rolls-Royce RR300 turbine, the coaxial rotor Ultra 2XL has a maximum range of 300 nm (555 km) with standard fuel, but it can be fitted with a 125-US gallon (475-liter) aux tank that increases the range to 900 nm (1,665 km) while delivering a 500-lb. (225-kg) payload.
The Ultra 2XL’s coaxial design, with its 24-foot (7.3-meter) rotor disk, according to Phenix, produces a “30 percent increase in lift over traditional designs, as the coaxial blades avoid the effects of dissymmetry of lift.”
Other key features of the aircraft include a large cargo pod that can hold 1,300 lb. (590 kg) of payload and provides a cargo volume of 137 cubic feet (3.87 cubic meters). The aircraft also can carry sling loads with a cargo hook.
The Ultra 2XL has a dash speed of 100 knots (185 km/h), a loiter speed of 55 kts (100 km/h), an endurance of greater than six hours with a 75-lb. (35-kg) payload, and a service ceiling of 18,000 feet (5,485 meters). It can operate in temperature regimes from -40 C to 55 C (-40 F to 130 F) and in winds (takeoff and landing) up to 25 kts (45 km/h). It is equipped with detect and avoid (DAA core avionics) and is fully capable of participating in a BVLOS environment.
To date, the aircraft’s development has been substantially funded by a series of grants from the U.S. Department of Defense, including under the Agility Prime program.
Last year McMinnville, Oregon-based Phenix also was selected by the U.K. Ministry of Defense as a participant in the UAS Heavy Lift Capability (UASHLC) framework. According to Phenix, the Ultra 2XL “will compete in multiple sub lots of the UASHLC framework,” including maritime cargo delivery, use of novel payloads, and further platform and system integration.
Last year, Phenix announced that the 2XL had achieved more than 100 safe test flights that demonstrated a variety of capabilities including several hover scenarios, carrying a payload over 600 lb. (270 kg), performing rapid setup in under 20 minutes (like several of its competitors it also can be deployed from a 20-foot shipping container), and demonstrating C2 LoS and automated aircraft operation and flight modes.
Rain Industries
Rain focuses on bringing autonomous aerial firefighting solutions to existing rotorcraft. The Rain MK2 is based on the Mosquito kit helicopter. It can carry 30 US gallons (115 liters) of water or dispersant, has a 23-mile (37-km) radius, and stays airborne for an hour.
Rain has also demonstrated its technology aboard an uncrewed Sikorsky Black Hawk equipped with the Sikorsky Matrix autonomy system. Rain’s technology enables the rapid launch of uncrewed firefighting helicopters to quickly engage fires before they spread, and the pre-positioning of firefighting helicopters in difficult to reach areas.
Rain’s wildfire mission autonomy system on the aircraft locates fires, plans flight path drops, and provides firefighters with critical information to ensure safety and coordination.