The Rotor Systems Research Aircraft (RSRA) was developed by Sikorsky for NASA and the Army. The RSRA was developed to allow the inflight measurement of helicopter rotor characteristics. The airframe was developed using an existing Sikorsky S-61 main rotor, an S-61 roller gearbox, and a highly modified Sikorsky S-67 airframe. The RSRA could be fitted with TF34 turbofans and wings to allow compound helicopter configurations to be experimentally investigated at speeds up to 300 knots (560 km/h). In addition, it could fly as a fixed-wing aircraft without a rotor.
Unique among helicopters of its time, it was fitted with a crew emergency extraction system. This system, when activated, fired explosive bolts that severed the main rotor blades, escape panels were blown off the roof of the aircraft, then the crew was extracted using rockets.
The RSRA was a unique pure research aircraft developed to fill the void between design analysis, wind tunnel testing, and flight results of rotor aircraft. The joint NASA/Army project began in December 1970, first flight on October 12, 1976 with the first of two aircraft arriving from Sikorsky to NASA on February 11, 1979.
One notable test performed with the RSRA was the use of the main and tail rotor load measurement system to determine the vertical drag of the airframe.
In 1981, NASA and the US Army solicited proposals for fitting a four-bladed main rotor to the RSRA. Sikorsky proposed fitting a UH-60A main rotor to the RSRA in their proposal, while Hughes Helicopters proposed fitting a YAH-64A main rotor and Boeing Vertol proposed fitting a YUH-61A or Model 347 (four-blade CH-47) main rotor. In the end, this program did not proceed.
-VTOL UP : ROTOR POWER
-VTOL DOWN : FLAPS
-TRIM UP : COLLECTIVE ROTOR BLADE PITCH
-THROTTLE : JET ENGINE POWER
-AG8 : GYROSCOPE
HELI MODE :
TURN VTOL UP, THEN TURN TRIM UP
PLANE MODE :
TAKEOFF = VTOL DOWN 50% POWER THROTTLE 100% PULL UP WHEN REAR LANDING GEAR RISE UP FROM GROUND
LANDING = VTOL DOWN 100% POWER THROTTLE 42%
- AWESOMENESS360 13 days ago
- Created On Android
- Wingspan 60.2ft (18.3m)
- Length 77.9ft (23.7m)
- Height 18.0ft (5.5m)
- Empty Weight -113,220lbs (-51,356kg)
- Loaded Weight 19,718lbs (8,943kg)
- Power/Weight Ratio 17.095
- Wing Loading 43.9lbs/ft2 (214.4kg/m2)
- Wing Area 449.1ft2 (41.7m2)
- Drag Points 15617
- Number of Parts 237
- Control Surfaces 5