sikorsky s 67

Sikorsky S 67 - In the late 1960s, Sikorsky Aircraft produced many helicopter models but lost contracts to develop new helicopters. In 1966, Lockheed was awarded a contract for the United States Army's Advanced Fire Support System (AAFSS), but their AH-56 Cheyenne attack helicopter ran into serious design problems. On November 20, 1969, Sikorsky initiated work on a new helicopter that could be used primarily as a gunship, but could also be used in other roles. This helicopter was designated S-67 Blackhawk, and its design and construction was financed by Sikorsky himself.

The Sikorsky S-67 Blackhawk was a very versatile helicopter that had great performance, but also had a few shortcomings that the U.S. Army couldn't overlook. The helicopter's narrow fuselage and air brakes are shown in this image.

Sikorsky S 67

The Sikorsky S-67 Blackhawk was designed as a high-speed attack helicopter with a small lift-generating wing. The pilot and co-pilot/gunner sat in tandem in the helicopter cockpit, with the co-pilot in the front seat and the pilot in the back seat. The pilot entered the cockpit from the left side of the helicopter, and the co-pilot from the right. The narrow, streamlined fuselage was only 3 feet 10 inches (1.2 m) wide, which reduced the helicopter's drag and increased survivability by making it a smaller target for enemy gunners. Behind the cockpit was a storage compartment that could be used for additional equipment or for transporting personnel.

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This photo shows the original tail of the S-67, which had no rudder. Note the bend of the tail. Air brakes can be seen on the upper surfaces of the wings. The main course had a 7-foot (2.1 m) track.

To reduce development costs and time, the S-67 was designed to use the Sikorsky S-61/SH-3 Sea King dynamic propulsion system. This includes two 1,500 hp (1,119 kW) General Electric T58-GE-5 turboshaft engines and their propulsion, impeller, hydraulic and electrical systems. The five-bladed S-67 rotors had 22 inches (559 mm) of tips set back 20 degrees to delay compressibility effects, reduce vibration and noise. The net effect was that the blades allowed the helicopter to reach higher speeds. The main rotors also had hub fairings and their collective pitch adjustment was modified for increased sensitivity and range.

The S-67's main gear is retracted and the floats are mounted on the hull sides. Thin helicopter wings stretched by sponsors. Each wing has two hardpoints, additional fuel tanks or equipment. Each wing also had three air brakes: two located along the upper surface and one along the lower surface. With the air brakes on, the helicopter slowed down twice as fast as without the air brakes. In addition, air brakes can be activated during combat for unparalleled maneuverability. The S-67 was the first helicopter with air brakes.

A five-blade, 10-foot-7-inch (3.2 m) diameter tail rotor was mounted on the left side of the S-67's vertical fin. The lower fin with the fixed tail wheel extended under the tail of the helicopter. The large upper and lower plates were serrated to counteract the torque of the main rotor at speeds above 46 miles per hour (74 km/h). This allowed for controlled flight without a tail rotor as long as the S-67's speed was over 46 miles per hour (74 km/h). If the tail rotor were lost, the helicopter could return to base and land like a conventional aircraft. The S-67 used an all-moving horizontal stabilizer, which increased the helicopter's maneuverability and reduced rotor stress.

S 67 Blackhawk: The Attack Helicopter The Pentagon Kept Saying No To

Note the angle of the fully movable horizontal stabilizer as the S-67 approaches for landing. The landing gear was found to be unsuitable for operating from unimproved locations. The helicopter's twin main landing gear sank into the soft ground and the landing gear door had only 9.75 inches (248 mm) of clearance.

With a payload of 7,000 pounds (3,175 kg), the S-67 could carry a variety of weapons. An Emerson Electric Company TAT-140 removable turret mounted under the cockpit could mount a 7.62mm minigun (M134), a 20mm triple-barrel rotary cannon (M197), a single-barrel rotary cannon (XM188), or a 40mm grenade launcher ( M129). Four hardpoints underneath could carry two drop tanks, up to 16 TOW missiles or up to eight missile pods. Each 2.75 in (70 mm) rocket pod contains 19 rockets for a total of 152 rockets.

In this photo you can see the rudder of the S-67. One is on the upper fin under the tail rotor and the other is on the lower fin. Pylons were installed on the wing hardpoints and drop tanks were fitted at the inner stations. The turret is installed with a 20 mm M197 three-barreled gun.

The S-67 had a wingspan of 27 feet 4 inches (8.3 m) and a rotor diameter of 62 feet (18.9 m). The fuselage was 64 ft 2 in (19.6 m) long and the overall length of the helicopter including rotor was 74 ft 1 in (22.6 m). The mast height of the S-67 was 15 feet (4.6 m) and the tail rotor tip was 16 feet 4 inches (5.0 m). The maximum speed of the helicopter was 213 miles per hour (343 km/h); maximum cruising speed was 201 mph (324 km/h) and normal cruising speed was 167 mph (269 km/h). The S-67 could climb at 2,000 feet per minute (10.2 m/s) and had a service ceiling of 20,000 feet (6,096 m). The helicopter could hover up to 9,700 feet (2,957 m) with ground effect and could hover up to 6,500 feet (1,981 m) without touching the ground. Maximum range on internal fuel was 325 miles (523 km), but its normal combat range was 220 miles (354 km). With external fuel tanks, the range was extended to over 600 miles (966 km). The S-67 had a curb weight of 12,525 lb (5,681 kg), a normal weight of 18,500 lb (8,391 kg) and a maximum takeoff weight of 22,050 lb (10,002 kg).

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S-67 seen in the same configuration as in the previous photo. A helicopter is over Cologne, Germany on its European and Middle Eastern tour in 1972.

The construction of S-67 began on February 15, 1970 and progressed rapidly. The helicopter made its first flight on August 20, 1970. Flight tests have proven that the S-67 is very responsive, agile, smooth and quiet. The helicopter was capable of rolls, loops and split-S turns - although only right rolls were performed. On December 14, 1970, Sikorsky test pilots Kurt Cannon and Byron Graham set a new absolute speed record in the S-67, averaging 216,841 miles per hour (348,971 km/h) over a 3 km (1.86 mile) route ). They then set a new record on December 19, 1970, averaging 220.888 miles per hour (355.485 km/h) over a distance of 15-25 kilometers (9.3-15.5 miles).

In 1971, the S-67 flew 3,500 miles (5,633 km) over 12 US military bases. In addition to the Sikorsky demonstration flights, the helicopter made 147 demonstration flights with military personnel. During these flights, the S-67 made 155 rolls and 140 split-S turns.

In the S-67, a system to counteract fan torque in the fin was tested. Note the controls above and below the fan. No problems were encountered with the fan in the fin, but the helicopter was converted back to a conventional tail rotor.

Anigrand Models 1970 Sikorsky S 67 Blackhawk Attack Helicopter Kit Aa 2022

Between May 25 and June 13, 1972, the S-67 flew for 26 hours for a series of flight evaluations by the U.S. Army. The helicopter competed with the Bell 309/AH-1 KingCobra to replace the canceled AH-56 Cheyenne. For the AAFSS role, the S-67 was designated the AH-3 and Sikorsky's proposal included the addition of an additional hardpoint on each wing, bringing the total to six. This allows the S-67 to carry up to 24 TOW missiles. While the S-67 was praised for its performance and most flight characteristics, the evaluation found a number of shortcomings. The Army did not award the contract to either Sikorsky or Bell and decided to initiate a new armed attack helicopter program, which was eventually won by the Hughes AH-64 Apache.

The S-67 underwent a number of changes in late 1972. Rudders have been added to the ventral and dorsal fins to increase yaw control. The compartment behind the cockpit was modified to allow the transport of six troops. Hardpoints have been added to the wing so that each can carry a Sidewinder missile. A chopper was added below the helicopter, allowing the S-67 to carry an external payload of 7,000 lb (3,175 kg).

After tests of the rotor with a fan in the tail, a small door was added to the left side of the fuselage to access the compartment behind the cockpit. Initially, access was (with some difficulty) through a door under the fuselage (seen above). The S-67 was then painted in a light desert camouflage and this was the final configuration of the helicopter.

With no interest from the U.S. Army, Sikorsky offered the S-67 for export. At the end of 1972, the S-67 embarked on a two-month journey through Europe and the Middle East. Over 7,500 miles (12,070 km) driven.

Sikorsky Awarded $556.1m For Black Hawk Production

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