Hamilton H-47

https://en.wikipedia.org/wiki/Hamilton_H-47

The Hamilton H-45 and H-47 were six-passenger-seat, all-metal, high-wing
monoplanes powered by single Pratt & Whitney radial engines. They were built for
passenger and mail-carrying work in the US in the late 1920s.

The Hamilton Metalplane Company, which merged with Boeing in 1926, built some of
the earliest all-metal US aircraft. The H-45 and the H-47, which differed
chiefly in having a more powerful engine, were part of that series.

Both types were corrugated-aluminium-skinned in the Junkers style. The high
wings were semi-cantilevers, unsupported apart from pairs of parallel struts
from the fuselage bottom edge to the wing close to the fuselage. The main legs
of the fixed, tailwheel undercarriage were attached at the same wing points as
the struts and joined laterally by inverted V bracing. The fuselage was
flat-sided, with wide windows to the passenger cabin under the wing. This was
accessed via a portside door, aft of which was a smaller door into a baggage
compartment. The two crew members sat in a cabin in front of the wings, accessed
by a rooftop hatch. The tail was conventional, with a braced tailplane.

Both the H-45 and the H-47 were powered by a single, uncowled, Pratt & Whitney
9-cylinder radial: the H-45 had a 450 hp (335 kW) Wasp and the H-47 a 525 hp
(390 kW) Hornet. The Hornet gave a 10 mph (16 km/h) increase in cruising speed
and a slight (3%) increase in useful load to 2300 lb (1043 kg).

Both types first flew in 1928. Both could be mounted on floats. In all, about 25
H-45s and 21 H-47s were built.

H-45 and H-47

Role
Civil passenger and mail carrier

National origin
United States

Manufacturer
Hamilton Metalplane Company

Designer
James McDonnell

First flight
1928

Number built
46

Variants

H-45 Wasp powered, ~25 built.

H-47 Hornet powered, 20 built.

H-47 Special 525 hp (390 kW) Wright Cyclone powered, span extended to 60 ft 5 in
(18.4 m). One built.

UC-89 Single impressed aircraft.

Specifications (H-47)

General characteristics
Crew: two
Capacity: six passengers
Length: 34 ft 2 in (10.41 m)
Wingspan: 54 ft 5 in (16.59 m)
Height: 9 ft 4 in (2.84 m)
Wing area: 390 sq ft (36 m2)
Empty weight: 3,699 lb (1,678 kg)
Gross weight: 5,750 lb (2,608 kg)
Fuel capacity: 140 US gal (120 imp gal; 530 L)
Powerplant: 1 × Pratt and Whitney R-1690 Hornet 9-cylinder air cooled radial,
525 hp (391 kW)

Performance
Maximum speed: 145 mph (233 km/h; 126 kn)
Cruise speed: 125 mph (201 km/h; 109 kn)
Stall speed: 55 mph (89 km/h; 48 kn)
Range: 600 mi (521 nmi; 966 km)
Service ceiling: 15,000 ft (4,600 m)
Rate of climb: 900 ft/min (4.6 m/s)





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