Беспилотный вертолет противолодочной обороны QH-50 DASH

Remotely piloted Anti Submarine Warfare helicopter

The Gyrodyne QH 50 DASH (Drone Anti Submarine Helicopter) is a small drone helicopter built by Gyrodyne Company of America for use as a long range anti submarine weapon on ships that would otherwise be too small to operate a full sized helicopter. It remained in production until 1969. Several are still used today for various land based roles.

DASH was a major part of the United States Navy's Fleet Rehabilitation and Modernization (FRAM) program of the late 1950s. FRAM was started because the Soviet Union was building submarines faster than the US could build anti submarine frigates. Instead of building frigates, the FRAM upgrade series allowed the US to rapidly update by converting older ships that were less useful in modern naval combat. The navy could upgrade the sonar on World War II era destroyers but needed a stand off weapon to attack at the perimeter of the sonar's range. The old destroyers had little room for add ons such as a full flight deck. The original DASH concept was a light drone helicopter that could release a nuclear depth charge or torpedoes. The aircraft was considered expendable. The manned Gyrodyne Rotorcycle program of the mid 1950s provided prototype work for the DASH, and ultimately the Rotorcycle was modified to produce the initial drone version, the DSN 1/QH 50A The DSN 1 was powered by a Porsche YO 95 6 72 hp piston engine and carried one Mark 43 homing torpedo. The next developmental version was the DSN 2/QH 50B that was powered by two Porsche YO 95 6 engines and also carried a single Mk 43. Serial production of the DASH began with the third version, the DSN 3/QH 50C, in which a Boeing T50 4 turboshaft engine replaced the piston engine and the payload was increased to two Mark 44 torpedoes. A total of 378 QH 50Cs were produced before production ended in January 1966. A single QH 50A, (DS 1006), which had been retired in 1961 after contractor testing, was re activated in 1964 to test tilt float landing gear. A long cylindrical float was added to each corner of the extended skid framework. Each float could rotate 90° from horizontal, oriented to straight ahead, and incorporated a pad at the end for landing on hard surfaces. For landing on water the floats were rotated to the vertical position and the helicopter settled until the floats were approximately 75% submerged, giving a high degree of stability.

thumb|A QH 50C on board the destroyer USS Allen M. Sumner (DD 692) during a deployment to Vietnam between April and June 1967. The DASH's control scheme had two controllers: one on the flight deck, and another in the combat information center. The flight deck controller handled take off and landing. The controller in the Combat Information Center (CIC) would fly DASH to the target's location and release weapons using semiautomated controls and radar. The CIC controller could not see the aircraft or its altitude and occasionally lost operational control or situational awareness. Late in the program, there were successful experiments to add a TV camera to the drone. These DASH SNOOPYs were also used as airborne spotters for naval gunfire. A tethered landing system was developed to land and take off in up to Force 6 seas. This system consisted of steel rails that were screwed to the flight deck and a cable system to pull the helicopter out of the hangar bay. The helicopter was attached to the steel rails so that it would not slide off the flight deck in heavy seas. This system was occasionally set up and used aboard ship, but never used in rough seas to launch a helicopter. The DASH came about because Gyrodyne had worked with the United States Marine Corps to develop a small, experimental co axial helicopter, the RON Rotorcycle, for use as a scouting platform. A co axial helicopter has two contrarotating main rotors to control torque, unlike the more common main rotor/tail rotor found on most helicopters. Co axial rotors put more power into lift, allowing shorter rotor blades. Both traits help a helicopter to be as small as possible. On the downside, the blades must be kept very far from each other to avoid colliding, since the blades flex as they rotate. This leads to increased complexity and decreased manoeuvrability. For a drone, these trade offs were fine. For the DASH role, the original marine version had a turboshaft engine for improved performance and the replacement of the seats and controls with a remote control system and stowage for two Mark 44 torpedoes. In this form the DASH could be flown up to 22 mile (35 km) from the ship, giving a submarine no warning that it was under attack, at least until the torpedo entered the water. Since it was expendable, DASH used off the shelf industrial electronics with no back ups. The controls were multi channel analog FM. Over 80% of operational aircraft losses were traced to single point failures of the electronics. A total of 10% of the losses were from pilot errors, and only 10% of the losses were from engine or airframe failures. The DASH program was canceled in 1969 and withdrawn from service 1968–1973. DASHes proved unreliable in shipboard service, with over half of the US Navy's 746 drones lost at sea. This was possibly due to inadequate maintenance support, as other services had few difficulties with their DASHes. Although low reliability was the official reason, the manufacturer pointed to the expenses of the Vietnam War, and the lack of need for antisubmarine capability in that war. Modified DASH vehicles continued to operate for several more years in the Vietnam War. With attached television cameras, they were used as remote artillery spotters and organic reconnaissance by their ships. Until May 2006, a small number of QH 50D DASH drones were operated by the United States Army at White Sands Missile Range, where they were used to tow targets and calibrate radars and electronic systems. The Japanese Maritime Self Defense Force (JMSDF) operated a fleet of 20 QH 50 drones, for use on its Takatsuki class and Minegumo class destroyers. Because the JMSDF regarded the DASH operation as highly prestigious and the aircraft were flown and serviced regularly, they suffered a much lower loss rate than the US Navy. However, with the difficulty of maintaining DASH operations after the termination of the U. S. program, the drones and associated equipment were removed from JMSDF service in 1977.

DSN 1U. S. Navy designation for nine pre production aircraft, redesignated QH 50A in 1962. DSN 2U. S. Navy designation for three pre production aircraft, redesignated QH 50B in 1962. DSN 3U. S. Navy designation for 373 production aircraft, redesignated QH 50C in 1962. QH 50ADSN 1 redesignated in 1962, nine pre production aircraft for evaluation, with a 72 hp (54 kW) Porsche flat four piston engine. QH 50BDSN 2 redesignated in 1962, three pre production aircraft powered by two 86 hp (64.5 kW) Porsche flat four piston engines. QH 50CDSN 3 redesignated in 1962, production aircraft powered by a 300 shp (225 kW) Boeing T50 8A turboshaft engine, 373 built. QH 50D Production aircraft with a larger Boeing T50 12 turboshaft engine, fibreglass rotor blades, increased fuel capacity, and no tail assembly. 377 built. QH 50DM There were 10 modified QH 50Ds manufactured (Serial number 150AO 160AO). The "DM" 550shp was supplied by a modified version of the Boeing T50 12. These were used for military reconnaissance for the United States Army during the Vietnam War. YQH 50E Three QH 50D aircraft modified with Allison T63 A 5A engines. QH 50F Proposed production version of YQH 50E, not built. QH 50H Proposed twin engine version of QH 50F with larger fuselage and rotors, not built.

VersionSerialLocationNotesQH 50CDS 1045Pima Air & Space Museum, Tucson, ArizonaThe oldest existing QH 50QH 50CDS 1176Aviation Unmanned Vehicle Museum, Caddo Mills, Texas. "Lucy" the only surviving Peanuts character. QH 50CDS 1190American Helicopter Museum, West Chester, Pennsylvania. Marked as DS‑1082. Moved from Museum of Flight, Seattle, Washington. QH 50CDS 1199Orleck (DD 886), Lake Charles, Louisiana QH 50CDS 1235Cradle of Aviation Museum, Garden City, New York QH 50CDS 1261Russell Military Museum, Russell, IllinoisMoved from the Museum of Aviation, Warner Robins, Georgia. QH 50CDS 1322Military Heritage Collection of North Texas, Nevada, Texas QH 50CDS 1347USS Laffey (DD 724), Patriots Point, Mt. Pleasant, South Carolina QH 50DDS 1482The Helicopter Museum, Weston super Mare, North Somerset, EnglandQH 50DDS 1543USS Joseph P. Kennedy (DD 850), Battleship Cove, Fall River, MassachusettsSnoopy version. Actually DS 1543A, a fully operational replica built by the Gyrodyne Foundation. US Army markings. QH 50DDS 1660Aerospace Museum of California, Sacramento, California QH 50DDS 1679Patuxent River Naval Air Museum, Lexington Park, Maryland QH 50DDS 1757Penn State University Aeronautical Engineering School, Hammond building, Pennsylvania QH 50DDS 1914Hawthorne Ordnance Museum, Hawthorne, NevadaFake serial but fully functional replica, built as a tribute to Gyrodyne's founder, and on loan from the Foundation. Fake serial but fully functional replica. Occasionally makes public appearances. QH 50DJ 19Japan Maritime Self Defence Force (JMSDF) Kure Museum, Hiroshima, Japan