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Bede BD-4

bedebd4


The BD-4 is a two/four seat utility aircraft designed by Jim Bede to be built by homebuilders with simple shop tools and no previous experience. The BD-4 was first introduced in 1968.


Only the wings are constructed of fiberglass. Each wing panel is built around 24 glass fibre “panel ribs”, which are slid over a 6½” diameter extruded aluminium spar to which they are secured by epoxy resin and tube clamps. Each wing then slides for 12 inches over a smaller centre section tube. The fueselage is an all metal structure of bolted together design made of 2024-T3 formed angles. The skins are “Pop” riveted or bonded to the primary structure. The all metal empennage consists of a swept fin and rudder and an all moving tailplane. The main undercarriage legs are formed from 2024-T3 aluminium plate which rotates on a pivot point in the fuselage, shock absorption being rubber in compression. The nose wheel is non-steerable. Fuel is carried in the panel ribs, the normal capacity is 24 Imperial gallons in each wing. Engines from 108 to 200 h.p. have been fitted, giving up to 190 mph If built with a fuselage extension it's a true 4-seater. Fuel tanks can be up to 80 USG (or even more).


The BD-4B is a kit-built high-wing 2- or 4-place all metal cruiser that the builder can configure for either tricycle or tailwheel landing gear. The 2-place, 1550 lb. gross weight BD-4B is stressed for 9 Gs positive and negative. Designed for a range of Lycoming aircraft engines, specially designed parts and plans were available from BedeCorp, or some parts and materials could be purchased out of stock from aviation suppliers. Specified materials are stock items and sizes widely available in the US and Canada, and many other countries.


Specially designed parts are limited, including the aluminum honeycomb-construction ribs and the tubular spar for the new all-metal wings. Although the BD-4B meets or exceeds the structural requirements for certified aircraft as specified in FAR - Part 23, it is not certified, and is intended for construction and operation only as an amateur-built airplane.


The all-metal wings of the BD-4B with 0.50 inch metal honeycomb panels used to fabricate the ribs, which are bonded to the tubular spar with the same adhesive used in US military fighters, and then the metal skin is bonded to the edges of the ribs and rear spar. This design results in a "wet" wing, with lower drag than the original. The new wing is available in kit form from BedeCorp, or you can build it yourself with detailed instructions.


The BD-4B has a bolt-together frame. This drastically cuts the need for welding, although some aircraft parts still require a skilled welder.


The BD-4C is derived from the popular BD-4B. On the surface the changes look small, however, the effect is more than substantial. The cabin is 4 inches wider. This provides for more comfort in the cabin. The section after the cabin has been stretched 14 inches. This provides more space for the rear seats in both leg and hip room.


The all-metal wings of the BD-4C is available in kit form from BedeCorp. The vertical and horizontal tails come bonded and ready to go at no extra charge.
The BD-4C also meets or exceeds the structural requirements for certified aircraft as specified in FAR - Part 23, it is not certified, and is intended for construction and operation only as an amateur-built airplane.


The BD-4C fuselage is an all-metal internally stressed design, with bonded .016 and .020 aluminum skin, blind-riveted load-carrying components. The wings are all-metal "wet" cantilever high wings with a 64-415 modified airfoil. The bonded wing skin is rivet-free except for the trailing edge spar. Ribs are one-half inch aluminum honeycomb. Flap deflection is 10, 20, and 30-degrees. Flaps and ailerons are designed to be interchangeable and are torque-tube controlled. Ready-to-mount 6.5-inch O.D. tubular main wing spars of 6061-T6 aluminum are sleeved for fast assembly to the fuselage spar. The three-piece spar assembles quickly, is light and strong and permits foldable wing option.


The horizontal stabilator is an all-flying design with 2.5-inch OD 2024-T3 center spar, 63 009 airfoil. 36-inch chord, 88-inch span, and light aluminum honeycomb ribs. The preassembled fin, rudder and stabilator are bonded to ribs, and load-carrying components are blind-riveted.


The BD-4C can be built in either tricycle gear or tail-wheel configuration. Standard fuel capacity is 48 US gallons, using wing tanks in six between-the-ribs wing bays. However, it is possible to expand fuel capacity using as many as ten bays in 160-HP and-up configurations, giving the plane a nine-hour cruising range with a restricted cabin weight envelope.

BD-4C
2 Place
Engine: Lycoming 108HP
Wing Span: 25.58 ft
Wing Area: 102.33 sq.ft
Wing Cord: 48 in
Aspect Ratio: 6.40 to 1
Length Overall: 21.38 ft
Height Overall: 7.23 ft
Width Wings Folded: 7.2 ft
Horizontal Tail Span: 7.3 ft
Aileron Area: 3.5 ft
Flap Area: 8.0 ft
Vertical Stabilizer Area: 12.0 sq.ft
Horizontal Tail Area: 21.3 sq.ft
Cabin Width: 42 in
Cabin Length: 89 in
Cabin Height: 41 in
Flap Span: 71% of span
Fuel Capacity: 51 to 80 USG
Aileron Deflection: Up 25 deg
Aileron Deflection: Down 6 deg
Elevator Deflection: Up 15 deg
Elevator Deflection: Down 6 deg
Servo Tab Up: 18 deg
Servo Tab Down: 10 deg
Rudder Left & Right: 25 deg
Flap Deflection: 10, 20, 30 degGross Weight: 1600 lbs.
Empty Weight: 960 lbs.
Useful Load: 640 lbs.
Wing Loading: 15.15
Power Loading: 14.35
Max. Speed @ Sea Level: 156 mph
Cruise Speed –75% power: 145 mph
Cruise Speed –65% power: 136 mph
Stall Speed Flaps Down: 54 mph
Stall Speed Flaps Up: 58 mph
Rate of Climb –Max.: 900 fpm
Take Off Run: 650 ft
Take Off to 50’ Obstacle: 1200 ft
Landing Roll: 500 ft
Maximum Range with 45 min Res: 900 miles

BD-4C
4 Place
Engine: Lycoming O-320, 150HP
Wing Span: 25.58 ft
Wing Area: 102.33 sq.ft
Wing Cord: 48 in
Aspect Ratio: 6.40 to 1
Length Overall: 21.38 ft
Height Overall: 7.23 ft
Width Wings Folded: 7.2 ft
Horizontal Tail Span: 7.3 ft
Aileron Area: 3.5 ft
Flap Area: 8.0 ft
Vertical Stabilizer Area: 12.0 sq.ft
Horizontal Tail Area: 21.3 sq.ft
Cabin Width: 42 in
Cabin Length: 89 in
Cabin Height: 41 in
Flap Span: 71% of span
Fuel Capacity: 51 to 80 USG
Aileron Deflection: Up 25 deg
Aileron Deflection: Down 6 deg
Elevator Deflection: Up 15 deg
Elevator Deflection: Down 6 deg
Servo Tab Up: 18 deg
Servo Tab Down: 10 deg
Rudder Left & Right: 25 deg
Flap Deflection: 10, 20, 30 degGross Weight: 2000 lbs.
Empty Weight: 1010 lbs.
Useful Load: 990 lbs.
Wing Loading: 17.59
Power Loading: 12.00
Max. Speed @ Sea Level: 172 mph
Cruise Speed –75% power: 165 mph
Cruise Speed –65% power: 155 mph
Stall Speed Flaps Down: 58 mph
Stall Speed Flaps Up: 63 mph
Rate of Climb –Max.: 1250 fpm
Take Off Run: 650 ft
Take Off to 50’ Obstacle: 1100 ft
Landing Roll: 600 ft
Maximum Range with 45 min Res: 900 miles

BD-4
Engine: Lycoming IO-360, 180 hp.
Speed max: 206 mph.
Cruise: 192 mph
Range: 782 sm.
Stall: 56 mph
ROC: 1800 fpm.
Take-off dist: 450 ft
Landing dist: 500 ft.
Service ceiling: 23,000 ft
Fuel cap: 50 USG.
Weight empty: 1140 lbs
Gross: 2500 lbs.
Height: 7.53 ft
Length: 21.5 ft.
Wing span: 25 ft
Wing area: 102 sq.ft.
Seats: 4
Landing gear: nose wheel.

BD-4C
4 Place
Engine: Lycoming 180HP
Wing Span: 25.58 ft
Wing Area: 102.33 sq.ft
Wing Cord: 48 in
Aspect Ratio: 6.40 to 1
Length Overall: 21.38 ft
Height Overall: 7.23 ft
Width Wings Folded: 7.2 ft
Horizontal Tail Span: 7.3 ft
Aileron Area: 3.5 ft
Flap Area: 8.0 ft
Vertical Stabilizer Area: 12.0 sq.ft
Horizontal Tail Area: 21.3 sq.ft
Cabin Width: 42 in
Cabin Length: 89 in
Cabin Height: 41 in
Flap Span: 71% of span
Fuel Capacity: 51 to 80 USG
Aileron Deflection: Up 25 deg
Aileron Deflection: Down 6 deg
Elevator Deflection: Up 15 deg
Elevator Deflection: Down 6 deg
Servo Tab Up: 18 deg
Servo Tab Down: 10 deg
Rudder Left & Right: 25 deg
Flap Deflection: 10, 20, 30 degGross Weight: 2000 lbs.
Empty Weight: 1080 lbs.
Useful Load: 920 lbs.
Wing Loading: 19.06
Power Loading: 10.83
Max. Speed @ Sea Level: 183 mph
Cruise Speed –75% power: 174 mph
Cruise Speed –65% power: 169 mph
Stall Speed Flaps Down: 61 mph
Stall Speed Flaps Up: 65 mph
Rate of Climb –Max.: 1400 fpm
Take Off Run: 600 ft
Take Off to 50’ Obstacle: 1000 ft
Landing Roll: 600 ft
Maximum Range with 45 min Res: 900 miles

BD-4C
4 Place
Engine: Lycoming 200HP
Wing Span: 25.58 ft
Wing Area: 102.33 sq.ft
Wing Cord: 48 in
Aspect Ratio: 6.40 to 1
Length Overall: 21.38 ft
Height Overall: 7.23 ft
Width Wings Folded: 7.2 ft
Horizontal Tail Span: 7.3 ft
Aileron Area: 3.5 ft
Flap Area: 8.0 ft
Vertical Stabilizer Area: 12.0 sq.ft
Horizontal Tail Area: 21.3 sq.ft
Cabin Width: 42 in
Cabin Length: 89 in
Cabin Height: 41 in
Flap Span: 71% of span
Fuel Capacity: 51 to 80 USG
Aileron Deflection: Up 25 deg
Aileron Deflection: Down 6 deg
Elevator Deflection: Up 15 deg
Elevator Deflection: Down 6 deg
Servo Tab Up: 18 deg
Servo Tab Down: 10 deg
Rudder Left & Right: 25 deg
Flap Deflection: 10, 20, 30 degGross Weight: 2000 lbs.
Cockpit width: 46 in
Empty Weight: 1125 lbs.
Useful Load: 875 lbs.
Wing Loading: 19.06
Power Loading: 10.00
Max. Speed @ Sea Level: 203 mph
Cruise Speed –75% power: 192 mph
Cruise Speed –65% power: 180 mph
Stall Speed Flaps Down: 61 mph
Stall Speed Flaps Up: 65 mph
Rate of Climb –Max.: 1700 fpm
Take Off Run: 600 ft
Take Off to 50’ Obstacle: 750 ft
Landing Roll: 600 ft
Maximum Range with 45 min Res: 900 miles

 

 


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