The Curtiss-Wright CW-14, named variously Travel Air, Sportsman, Speedwing and Osprey is an American 3-seat open cockpit single-bay biplane from the 1930s that was developed by Travel Air as a replacement for the highly successful Travel Air 4000.
As a result of the Great Depression, which also limited sales, Travel Air merged into the Curtiss-Wright group of companies before production could start, so all examples were built by Curtiss-Wright.
Its main claim to fame would be as the most numerous aircraft used in the Chaco war, where it formed the backbone of the Bolivian Air Force.
Previous Travel Air biplanes had been designed under the direction of Walter Beech, however the 14 was designed by Fred Landgraff, whose previous design experience included the Rearwin Ken-Royce and Alexander Eaglerock biplanes – to which the new design owed more than it did to the Travel Air 4000/4 it was intended to replace.
The handling of the aircraft reflected this, and it was described as being “no Travel Air”.
One of the possible reasons for the difference in handling may be due to the airfoil chosen – previous Travel Air biplanes had used the Travel Air #1 airfoil section, while the CW-14 used the Navy N-9 section which was also used by the Beechcraft 17 Staggerwing, and the Vought UO, while the contemporary Curtiss-Wright CW-12 and CW-16 used a 15% Clark Y.
Wings were built around four solid spruce spars, used single piece web ribs and were fitted with Frise ailerons on the top wing only, which provided good low speed control while helping counteract adverse yaw.
A plywood walkway was provided at the wing root on both sides, and the wing root was faired into the fuselage with a metal fillet.
The external push-pull tubes connecting the ailerons on the upper wing to the torque tube in the lower wing on the Travel Airs was dispensed with and the control lines were run inside the struts.
The main 35 US gal (130 L) fuel tank was in the fuselage ahead of the passenger compartment, while a 23 US gal (87 L; 19 imp gal) header tank was in the centre section of the top wing.
The empennage was built up from welded steel tubing, with the fin being ground adjustable for trim, and the elevators could be trimmed in flight.
The B-14R & C-14R had rounded elevators of slightly reduced area.
The cabane struts more closely resembled the “//\” of the Eaglerock than they did the “N” struts of the Travel Airs, as did the fuselage’s internal structure.
The fuselage was constructed of welded chromium-molybdenum alloy steel tubes forming a Pratt truss buried in the lower 3/5th of the oval section fuselage, which was faired with formers and battens to a nearly ideal form.
Again, unlike that of the Travel Air, no bracing wires were used, instead diagonal metal bracing kept it square.
The front cockpit seated two, which unlike the Travel Air 4000, lacked the door on the left side and the corresponding dip in the left longeron.
A metal cover was provided to fair over the front cockpit when not in use and dual controls were an available option at additional cost.
Room for baggage was provided with a large compartment behind the pilot and a small bin in the dashboard of the front cockpit.
The radial engine was enclosed in a NACA cowling to reduce drag.
Only two types of engines were offered – the unreliable 185 hp (138 kW) Curtiss R-600 Challenger, which was to be used only in the prototype, and several variants of the Wright Whirlwind family, ranging from 240 to 420 hp (180 to 310 kW).
The militarized C-14R had a large cutout in the trailing edge of the upper wing, redesigned cabane struts and it had the cockpit shifted forward to allow room for a gunner behind the pilot.
All surfaces aside from the aluminum panels on the top of the forward fuselage were covered in doped aircraft grade fabric.
The split axle undercarriage used oleo-pneumatic shock absorber struts, dispensing with the bungee cords used on previous Travel Airs.
It rode on 8.00 x 10 low pressure tires and was equipped with brakes.
Both tailwheels and tailskids were used.
A spate of accidents in Bolivia, and the resulting complaints resulted in a redesigned, taller tailskid for the Bolivian examples.
The Bolivian military examples were fitted with bomb racks which were cleared to carry up to 250 lb (110 kg) of bombs.
These aircraft were also armed with a fixed forward firing synchronized .30 in (7.62 mm) machine gun provided with 500 rounds of ammunition, while the observer/gunner was provided with a flexible .30 in (7.62 mm) machine gun that could be moved between 7 different positions, although for bombing missions, the gunner was often left behind.
The predecessor to the FAA, the Bureau of Air Commerce operated a single B-14B (msn 2011, NS1A, NC1A), and another was converted from a B-14B into the sole B-14R (msn 2003, NC12311) as a racing aircraft.
The armed militarized C-14R Osprey variants sold better, however aside from Bolivia which received 20, all of the remaining operators, which were in Latin America, operated them only in twos and threes.
CW-14C Travel Air
1931 (ATC 2-357) prototype with 185 hp (138 kW) Curtiss R-600 Challenger radial engine.