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Karhumäki Karhu 48B

Karhu-48B-1
Karhumäki Karhu 48B

 

The Veljekset Karhumäki O/Y company had been formed in 1924 and concerned itself with licence manufacturing. During 1946-1947 the company designed and built the Karhu 48B a high-wing strut-bracedfour-seat monoplane in collaboration with Valtion. The development team included Uuno Karhumäki, Matti Hahka and August Puukko from Karhumäki and Torolf Eklund, Johannes Joensuu, Oiva Lounivuo, Toivo Mäntysalo, Karl Konrad Wessman, Paavo Paitula, Olavi Raitio and Aaretti Nieminen from Valtion, Nieminen being appointed team leader.

WINGS: High-wing rigidly braced monoplane. Wing braced by steel-tube V-struts. Two-spar wooden structure covered with fabric. Flaps and ailerons with welded steel-tube frames and fabric covering.

FUSELAGE: Welded steel-tube structure covered with fabric.

TAIL UNIT: Braced monoplane type. Welded steel-tube framework covered with fabric.

LANDING GEAR: Tail wheel type with interchangeable wheels and skis. Faired side vees, incorporating springing, and two half axles hinged at centreline of underside of fuselage. Steerable tail wheel. The landing gear could be replaced by twin all-metal single-step floats of Karhumäki design and construction, with a rudder on port float.

POWER PLANT: One 190 hp Lycoming O-435A six-cylinder horizontally-opposed air-cooled engine driving an Acromatic 220 variable-pitch airscrew.

ACCOMMODATION: Enclosed cabin seating four, two single seats in front with removable dual controls and a full-width seat aft. Entrance door on each side. Two baggage compartments. Cabin heating and ventilation. Radio fitted as standard.
 
Two prototypes were completed, the first, registered OH-VKK and named Nalle, was flown for the first time by Uuno Karhumäki (the youngest of the Karhumäki brothers) on July 20, 1948. The second, which flew later that year, was registered OH-VKL and named Tavi. Planned production did not materialize by the import of cheap military surplus aircraft, and subsequently both aircraft were used by Karhumäki.
 
Karh-Karku-04
Karhumäki Karku 48B (OH-VKL c/n 6) "Tavi"
 

OH-VKL eventually had its wing modified and was redesignated Karhu 48B, it was reregistered OH-KUA in 1961 when it was sold to O. Marjamäki in Vilppula. After being deregistered in 1973, the aircraft eventually ended up at the Suomen Ilmailumuseo (Finnish Aviation Museum), restored by Karair in 1988 into the original livery and registration.

Karhu-48B-2

 

Gallery

 

Specifications:
Karhu 48B
Engine: 1 × Avco Lycoming O-435A 6-cyl. air-cooled horizontally-opposed piston engine, 140 kW (190 hp)
Propeller: 2-bladed Aeromatic 220 variable-pitch
Length: 7.85 m (25 ft 9 in) (landplane)
Wingspan: 11.54 m (37 ft 10 in)
Wing area: 17.31 sq.m (186.3 sq ft)
Max takeoff weight: 1,310 kg (2,888 lb)
Maximum speed: 229 km/h (142 mph; 124 kn)
Cruising speed: 186 km/h (116 mph; 100 kn)
Range: 700 km (435 mi; 378 nmi)
Service ceiling: 4,800 m (15,748 ft)
Crew: 1
Capacity: 3 passengers

 

Karhu-48B-3

 

Landplane
Span: 37 ft 10 in (11.54 m)
Length: 25 ft 9 in (7.85 m)
Wing area: 186.25 sq.ft (17.31 sq.m)
Weight empty: 1,789 lb (813 kg)
Weight loaded: 2,882 lb (1,310 kg)
Max speed: 142 mph (229 kmh)
Cruising speed: 116 mph (186 kmh)
Landing speed: 48 mph (78 kmh)
Service ceiling: 15,745 ft (4,800 m)
Cruising range: 435 mls (700 km)

Seaplane
Span: 37 ft 10 in (11.54 m)
Length: 26 ft 6.5 in (8.10 m)
Wing area: 186.25 sq.ft (17.31 sq.m)
Weight empty: 1,991 lb (905 kg)
Weight loaded: 3,080 lb (1,400 kg)
Max speed: 126 mph (203 kmh)
Cruising speed: 109 mph (176 kmh)
Alighting speed: 52 mph (83 kmh)
Service ceiling: 13,780 ft (4,200 m)
Cruising range: 404 mls (650 km).

 

 

 

 

 

 

 

 


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