![]() ![]() Monte-Copter then built the three-seat Model 15 Triphibian (N69P) which flew in 1960. The prototype, N68P, flew in 1955 and was later modified to become the Model 12, with a single tail fin. ![]() This piston engine was then replaced by two externally-mounted Turbomeca Palouste turbojets. It was driven by a 135hp Lycoming O-290 engine which generated cold airflow to the rotor tips. The two-blade rotor had control paddles similar to the Hiller system. The first design was the Model 10, which was a two-seat machine with a large bubble canopy and a tailboom mounting a tailplane with large twin rudders. was established in 1953 in Seattle to design and build light helicopters. Provision for carrying one stretcher and attendant. Baggage compartment with capacity of 0.79m 3. Oil capacity 4.5 litres.ĪCCOMMODATION: Pilot and two passengers in enclosed cabin, with forward-sliding canopy. Fuel in wings and in wing-tip tanks, with total capacity of 136 litres. POWER PLANTS: One Continental Model 141 air-compressor, rated at 200 gas h.p, mounted in rear fuselage. LANDING GEAR: Non-retractable tricycle type. ratio 340/ 35,000.įUSELAGE: Aluminium and magnesium bulkhead and keel structure, with fiberglass skin. ROTOR DRIVE: Cold-jet type, in which compressed air is ejected from blade-tip nozzles. Spherical bearings at pitch and flapping hinge. ROTOR SYSTEM: Two-blade main rotor with fully-articulated semi-rigid all-metal blades, attached to hub by specially-designed serrated fittings. WINGS: Small delta wings to offload rotor. Fuel tanks on the wing-tips serve also as stabilising floats during water operations. It has small delta wings to offload the rotor in forward flight. The Model 15 is of very simple design, with a fiberglass boat-type hull to permit operation from water as well as land. The prototype was scheduled for completion late in 1959. ![]() ![]() (9.75 m.)ĭeveloped from the Monte-Copter Model 12, the Model 15 Triphibian is a three-seat light helicopter with a "cold-jet" type of rotor drive, in which the rotor is turned by ejecting compressed air from nozzles at the blade-tips, without any form of combustion. No specification details are available except that the Model 12 has an empty weight of 454kg and a normal loaded weight of 635kg. In this form, it has been flying successfully since May, 1958. These engines were mounted on each side of the fuselage and were used to supply compressed air to rotor-tip nozzles, from which the air was ejected without any form of combustion, to turn the rotor.įurther modification of the airframe has led to the present Model 12, with the fuselage skin replaced and a single rudder, working in the jet efflux, instead of the former tail-boom. At that time it had small fixed wings to off-load the rotor in forward flight and a tail-boom carrying twin fins.Īfter initial tests had been completed, this airframe was modified into the Model 10A by removal of the wings and cabin skin and replacement of the Lycoming piston-engine by two Continental Model 140 (Turbomeca Palouste) air compressors. This aircraft began life in 1955 as the two-seat Monte Copter Model 10, powered by a 135hp Lycoming O-290-D2 engine, driving a two-blade rotor with servo-control surfaces mounted at 90° to the blades. It has since undergone considerable development and in its current form is known as the Model 12.Ī brief description of the Model 12 is given below, together with full details of the production development, designated the Model 15 Triphibian, which was scheduled for completion late in 1959. The company's first prototype was the Monte-Copter Model 10, which began its test programme in 1955. was incorporated in June, 1953, to develop a light helicopter featuring the "cold-jet" type of rotor tip-drive. Monte-Copter Model 15 Triphibian helicopter - development history, photos, technical data ![]()
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