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| The evaluation of three modified D XI fighters by the US
Army Air Service prompted the design of the D XII tailored
specifically to the USAAS specification. Designed
from the outset for the 440hp V-1150 (Curtiss D-12)
water-cooled engine, it was flown for the first time on
21 August 1924 with an example of this power plant
loaned by the US service to the manufacturer. The D XII
had no design commonality with the preceding D XI,
but was of similar mixed construction and, initially, retained
the sesquiplane configuration of its predecessor,
the upper wing having some degree of leading-edge sweepback and overhung ailerons. Unsatisfactory
characteristics displayed during initial trials
necessitated major re-design, the sweepback being
eliminated from the upper wing and a longer-span
lower wing being introduced. Greater torsional rigidity
was achieved by replacing the splayed V-type interplane
struts with N-type struts and attaching these by
single large-section struts to the top of the cabane strut
system. At the same time, the small fixed tailfin was
eliminated. Despite these extensive modifications, the
D XII still proved unacceptable to the USAAS and further development was abandoned.
 | A three-view drawing (1278 x 878) |
| WEIGHTS |
| Take-off weight | 1400 kg | 3086 lb |
| Empty weight | 998 kg | 2200 lb |
| DIMENSIONS |
| Wingspan | 11.00 m | 36 ft 1 in |
| Length | 6.74 m | 22 ft 1 in |
| Height | 2.77 m | 9 ft 1 in |
| Wing area | 21.83 m2 | 234.98 sq ft |
| PERFORMANCE |
| Max. speed | 250 km/h | 155 mph |
| Cruise speed | 220 km/h | 137 mph |
| Range | 1100 km | 684 miles |
| Anonymous, 14.11.2021 16:36 Fokker was essentially an empirical aircraft designer, meaning that when he found a successful formula he would stick with it, often too long. This fighter was essentially an attempt to sell the U.S. Army a Fokker D-VII with a few minor design improvements and an American engine. However, while the Fokker D-VII had been a world-beater in 1918, this was now 1924 and the design was becoming out of date. reply |
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