Sikorsky / Boeing SB-1
| SB> 1 defiant | |
|---|---|
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| Type: | military helicopter |
| Design country: | |
| Manufacturer: | |
| First flight: |
March 21, 2019 |
The Sikorsky / Boeing SB-1 Defiant is a military helicopter from the American manufacturers Sikorsky and Boeing . It is designed as a technology demonstrator and is intended to demonstrate the feasibility of the unusual configuration as part of the Joint Multi Role Technology Demonstration (JMR TD) program of the US armed forces and to serve the armed forces in the final selection of the concept for commissioning the development of a production-ready model. It competes with the Bell V-280 .
history
To renew the US military's aging helicopter fleet, the Future Vertical Lift (ATCO) program was launched in 2004 to develop a family of future helicopters. A subdivision into four weight classes is planned (light, medium, heavy, ultra). As a preliminary stage for the medium category, in which z. If, for example, the current models Sikorsky UH-60 and Boeing AH-64 fall, the concepts are to be examined and their suitability verified as part of the Joint Multi-Role (JMR) program. At the JMR, Sikorsky / Boeing competed against three other applicants ( Bell , Karem , AVX ), but ultimately only Bell and Sikorsky / Boeing were selected to build a demonstrator. Bell is sending the V-280 Valor, similar to the V-22 Osprey, into the race, while Sikorsky / Boeing are competing with a new concept based on the Sikorsky X2 , the SB> 1 Defiant .
In order to meet the requirements with regard to high airspeed, new concepts had to be used, as conventional helicopters are limited here. When designing the system, Sikorsky relied on experience from previous research programs. Sikorsky had already built and tested the Sikorsky S-69 together with NASA 40 years earlier . While jet engines were still responsible for propulsion at that time, a coaxial rotor was also used here . The final concept with a pusher propeller , albeit in a much smaller form, was tested in the form of the Sikorsky X2 from 2008 to 2010.
The first flight planned for 2017 took place on March 21, 2019 in West Palm Beach Florida.
construction
The main design features of the SB> 1 are the coaxial rotor combined with a pusher propeller . In order to reduce the air resistance at high flight speeds, the distance between the two coaxial rotors must be kept as small as possible. Since contact with the opposing rotor blades would have fatal consequences, the rotors must be made very rigid. The rotor and propeller are driven by two Honeywell T55 gas turbine engines , which are to be replaced by the more efficient, but still to be developed Future Affordable Turbine Engine (FATE) for a later series model .
Technical specifications
| Parameter | Data |
|---|---|
| crew | 2 |
| Passengers | 12 |
| Max. Takeoff mass | > 13,600 kg |
| Cruising speed | 250 kts (463 km / h) |
| Max. Hover altitude | 6000 ft at 35 ° C (1800 m) |
| Range | 229 NM (424 km) |
| Engines | two Honeywell T55 |
See also
Web links
Individual evidence
- ↑ a b Aviation Week: Bell, Sikorsky / Boeing To Build Army JMR Rotorcraft Demonstrators. Retrieved June 3, 2015 .
- ↑ a b c d Flugrevue: SB> 1 Defiant against V-280 Valor. Retrieved June 3, 2015 .
- ↑ Aviation Week: AVX Presses Case For Coaxial-Rotor JMR Demonstrator. Retrieved June 3, 2015 .
- ↑ Jane's: Boeing-Sikorsky prep final JMR design for 2015. Archived from the original on June 29, 2014 ; Retrieved June 3, 2015 .
- ↑ a b c Jane’s: Army chooses Sikorsky-Boeing and Bell for JMR helo demos. Archived from the original on January 8, 2015 ; Retrieved June 3, 2015 .
- ↑ Defense Update: Sikorsky, Boeing Team Introduces the SB> 1 Defiant. Retrieved June 3, 2015 .
- ^ Intelligent Aerospace: Sikorsky, Boeing to build SB> 1 Defiant helicopter technology demonstrator for future vertical lift. Retrieved June 3, 2015 .
- ^ Karl Schwarz: Sikorsky-Boeing SB> 1 takes off for the first flight. In: Flugrevue.de. March 22, 2019, accessed March 22, 2019 .
- ↑ a b Flight Global: Sikorsky, Boeing finalize design of SB-1 Defiant. Retrieved June 3, 2015 .