Beechcraft 76 Duchess
The Beech Duchess 76 was FAA-certified in January 1978. The T-tail four-seater is powered by 180-hp Lycomings. It cruises at 153 knots and has a single-engine climb at sea level of 235 feet per minute. Suggested price was $81,950. The twin features doors on both sides of the cabin, and optional avionics are similar to those on the Beechcraft Sierra. The Model 76 makes use of honeycomb-bonded wings for a smoother airfoil design with less drag and a lower manufacturing cost. Outstanding design characteristics of the new Duchess include an aerodynamically advantageous T-tail, which places the horizontal surfaces above the propeller slipstream for better stability and handling, and opposite-rotating propellers to eliminate the ‘critical engine” aspect of multi-engine flying.
Beech's new Model 76 Duchess was temporarily grounded because the rudder trim-tab push-rod became disconnected during a flight. Sixty-three of the light twins were affected. Beech designed new, stronger push-rods for both rudder and elevator trim tabs.
In 1980, a 28-volt electrical system was added to provide increased cranking power in cold weather, more power for avionics and more parts commonality with other Beech products.
A total of 437 produced between 1978 and 1982.
Engine: 2 x Lycoming O-360-AlG6D, 180 hp, one counterclockwise rotating Lycoming LO-360-A1G6D, 180 hp.
TBO: 2000 hrs.
Prop: Hartzell 2 blade, constant speed full-feathering 76 in.
Length: 29 ft.
Height: 9.5 ft.
Wingspan: 38 ft.
Wing area: 181 sq.ft.
Wing aspect ratio: 8.
Max ramp wt: 3916 lbs.
Max take off wt: 3900 lbs.
Empty wt: 2,565 lbs.
Useful load: 1,351 lbs.
Payload with full fuel: 751 lbs.
Max ramp wt: 3,916 lbs.
Zero fuel wt: 3500 lbs.
Max landing wt: 3900 lbs.
Wing loading: 21.5 lbs/sq.ft.
Power loading: 10.8 lbs/hp.
Max useable fuel: 100 USG/600 lbs.
Vyse: 85 kts.
Climb rate: 1248 fpm @ 97 kts.
Climb gradient: 772 ft/nm.
Rate of climb @ 8000 ft: 760 fpm.
Service ceiling: 19,650 ft.
SE rate of climb: 235 fpm @ 85 kts.
SE climb gradient: 162 ft/nm.
SE ceiling: 6170 ft.
Max speed: 177 kts.
Max Speed at 6,000ft; 166 kts.
Cruise @ 65% power @ 8,000ft: 156 kts.
Cruise Speed, 75%, 8,000ft; 164 kts.
Fuel flow @ 65% power @ 8,000ft: 112 pph.
Fuel Flow, 75%, SL; 10.8 gph.
Endurance @ 65% power @ 8,000ft: 5.1 hr.
Max cruise, 75 % pwr at 6,000 ft: 166 kts.
Econ cruise, 55% power at 12000 ft: 151 kts.
Duration at max cruise: 4.9 hrs.
Duration at econ cruise: 6.7 hrs.
Stalling speed clean: 70 kts.
Stall speed gear/flaps down: 60 kts.
Turbulent air penetration speed: 132 kts.
Retractable nose wheel undercarriage.