Boeing Model 6D (B-1D)
Although the Model-6D (B-1D) shared a similar designation with the 1919 B-1 (Model-6) flying boat and is listed in Boeing documents as a four-seater variant of the latter, it was structurally a completely new aircraft. Apart from the general layout, the only similarity was the shape of the rudder.
Innovative Design
The boat’s hull in the upper part had a box-like cross-section (the B-1 had a semicircular one), the contours of the nose were modified, and spray deflectors appeared above the chines. The pilot and three passengers were accommodated under a shared angular canopy.
The wing structure was entirely new: it used shortened wing panels from the Model-40, with the joint of the upper wing panels similarly located to the left of the axis of symmetry. Each side had one pair of interplane struts (the B-1 and Model-40 had two pairs). The stabilizer, like on the B-1, was supported by L-shaped struts but had a different shape and greater span.
The engine, like on the B-1, drove a pusher propeller, but it was now a 220 hp five-cylinder radial Wright J-5 “Whirlwind.”
Development and Variants
The development of the aircraft began in 1928. In May, the first of two examples (factory No. 1029) was built. The first flight took place in April; after testing, the aircraft was sold to Canada and registered as G-CASX.
The second aircraft, with an earlier factory No. 1028 but completed later, was equipped with a 420 hp P&W “Wasp” engine and registered as NC-5270.
Technical Specifications
| Modification | Model 6D |
| Wingspan, m | 12.10 |
| Length, m | 9.37 |
| Height, m | 3.66 |
| Wing area, m2 | 43.29 |
| Empty weight | 1017 |
| Maximum takeoff weight | 1516 |
| Engine type | 1 Piston engine Wright J-5 |
| Power, hp | 1 x 220 |
| Maximum speed, km/h | 153 |
| Cruising speed, km/h | 129 |
| Practical range, km | 282 |
| Service ceiling, m | 3656 |
| Crew, crew members | 1 |
| Payload | 3 passengers |
Image and diagram gallery of the Boeing Model 6D (B-1D)
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ArchivoAéreo Editorial Team
A group of aviation researchers and enthusiasts dedicated to documenting and preserving global aeronautical history. All articles are reviewed to ensure historical accuracy.
Sources & Accuracy
The information presented in this technical sheet has been compiled from declassified flight manuals, historical archives, and specialized literature. While we strive for maximum accuracy, some performance data may vary depending on the specific variant or operational conditions.