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Bowlus Dragonfly

Bowlus Bumblebee BBI

Nelson Bumblebee

 

bowlusdragonfly

 

The Bumblebee was designed by William Hawley Bowlus and built in 1946. A powered sailplane with vertical tail and two small stabilizers mounted on a single boom, the Bumblebee was equipped with manually retracting undercarriage and 16 hp pusher engine.
 
The Dragonfly, NX1955, designed by Hawley Bowlus, was the first auxiliary-powered self-launching glider to be produced in the U.S.A. The designers nicknamed this design the Bumblebee but they sold the powered glider under the official moniker, Dragonfly. Rebuilt from Bumblebee and with tricycle gear, it featured 2-place, side-by-side seating, retractable tricycle landing gear and a Nelson engine. Some were powered by 48hp Nelson H-63CP engine. The marketing was sponsored by the Nelson Engine Company as a vehicle for their two- cycle four cylinder 25hp engine. The cockpit pod was molded plywood, aluminum boom, 2-spar wood wing with plywood D-tube, fabric cover aft of spar.
 
While the concept was good, the airplane never achieved real success, because it didn't perform well, and because Nelson took his engine and left the partnership. The beautiful wooden fuselage pod made up of layers of mahogany was very labour intensive and thus very expensive. Some Dragonflys had the engine removed, converting them to pure sailplanes. The Dragonfly features a fully retractable tricycle landing gear with stearable nosewheel, dual control and a ratchet-wire pull starter in the cockpit for engine starts in flight or on the ground.
 
Of less than 10 built, 2 survived in 2008 at the National Soaring Museum.NX/NC34921 was restored in New York in 1964.

John Hess Auction Service Inc, Manheim, PA 17545, United States, consigned a Nelson-Bowlus BB-1 Dragonfly N33687 Glider and Culver Rigid Midge N215 jr. Racing Glider in May 2015.

 

bowlusdragonfly-1
Nelson Dragonfly / Bowlus Bumblebee BB1


Of less than 10 built, 2 survived in 2008 at the National Soaring Museum.

 

John Hess Auction Service Inc, Manheim, PA 17545, United States, consigned a Nelson-Bowlus BB-1 Dragonfly N33687 Glider and Culver Rigid Midge N215 jr. Racing Glider in May 2015.

 

Bumblebee
Engine: 16hp pusher
Wingspan: 41'0"
Length: 23'5"
Useful load: 355 lb
Speed: 75 mph
Range: 110 mi
Seats: 1
Undercarriage: rg (manual)
 
Dragonfly
Engine: 25 hp Nelson 4 cylinder engine (retractable)
Wing span: 14.42m / 47.3ft
Wing area: 15.7sq.m / 169sq.ft
Empty Weight: 263kg / 580lb
Payload: 163kg / 360lb
Gross Weight: 426kg / 940lb
Wing Load: 27.13kg/sq.m / 5.56lb/sq.ft
Max speed: 50 mph (80 km/h) (originally 70 mph (113 km/h) with power)
Empty weight: 580 lb (263 kg)
Gross weight: 940 lb (426 kg)
Span: 47 ft 4 in (14.4 m)
Height: 6ft 10 in (2.1 m)
Length: 20 ft 4 in (6.2 m)
L/DMax: 18
Seats: 2
No. Built: 7
Aspect ratio: 13.25

 

 


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