The McDonnell Model 86 was the first helicopter specially designed for the Navy vert-rep (vertical replenishment) mission — carrying supplies and ammunition between ships — and for the Marine logistic support mission — carrying heavy loads for short distances from ship-to-shore or from marshalling areas ashore to front-line units. Emphasis was placed during its design on extreme simplicity, ease of maintenance, and good flying characteristics while carrying underslung loads of up to 6804kg when operating at normal gross weight, or 9979kg when operating at overload gross weight. The powerplant installation, derived from that developed for the XHRH-1, consisted of two 3750eshp Allison XT56-A-2 turbines mounted atop the fuselage and providing compressed-air to the 726kg thrust McDonnell 12JP20 pressure jet at the extremity of each rotor blade. The crew of two consisted of a pilot on the starboard side and an aft-facing winch operator to port. There was no provision for carrying loads internally. Loads were to be carried externally on a sling, in a net, or in a specially-developed pod. This pod was to be fitted with a detachable tail unit to stabilize the load in flight and with large wheels to enable it to be towed on uneven ground after it had been delivered to forward bases. Consideration was also given to using the Fairchild pod which had been designed for the XC-120 twin-engined cargo aircraft.
Three XHCH-1 prototypes (BuNos 138654/138656) were ordered on 11 April, 1952, under Contract NOa(s)52-947 and a mock-up was inspected on 22 and 23 May, 1953. However, the programme was later cut back due to lack of funds. No prototypes were completed but a much revised mock-up was inspected on 15 and 16 November, 1956, and a full-scale rotor was tested on a hot-whirling bench beginning in December 1957. Additional budget cuts forced the Navy to terminate the contract on 18 January, 1959, before completion of a prototype. Nevertheless, McDonnell kept working on the Model 86 sky crane until June 1961.
Population: 0 (only a full-scale mock-up)
Navy serials assigned as [138654/138656]
Specs: Rotor diameter: 19.81m, length: 11.45m, height: 5.07m, empty weight: 6749kg, loaded weight: 16026kg, maximum weight: 19051kg, maximum speed at sea level: 185km/h, rate of climb: 16m/s, hover ceiling out of ground effect: 2285m, combat radius: 37km
Crew/passengers: 2 (1 pilot, 1 winch operator)
(I did that article loooong ago for my upcoming website, didn't keep track of sources then, sorry for that).
This is NOT so. The Model 1005 is variously found as the "Aerial Carryall" or the "Flying Truck" (the latter name being used for several projects) but it was submitted for an 1951 Army proposal for a midsize flying crane. I don't think I have ever seen a picture of that design. In the same period, Hiller also responded to a Navy request for an aerial-resupply helicopter with the huge "Class HC Heavy Lifter", a collapsible flying crane of tubular construction. Neither of these efforts reached the prototype stage. Obviously, "Class HC" is the category that McDonnell's Model 78 (the HCH) was competing for.
Here are some original company pics of the "Heavy Lifter" in scale model form:
from Spangenberg files,they spoke about Kaman K-6,Hughes
Model-233 and Gyrodyne GCA.21 as cargo-unloader helicopters
and I think they related to this Competition,and for GCA.24,
I think it was only developed from GCA.21,and didn't belong
to this one.