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| The last aircraft built by Boeing against an order for 30
PW-9 single-seat fighters was retained by the company
at the request of the USAAC for trials with a turbo-supercharged
version of the 510hp Packard 1A-1500
water-cooled engine (utilised by the FB-2). The USAAC
also requested an increase in wing area, because of the
higher weights involved, and while the standard PW-9
upper wing was retained, an enlarged lower wing was
introduced, resulting in an equi-span biplane with vertical
N-type interplane struts. The standard PW-9 armament
of two 7.62mm synchronised machine
guns was augmented by a pair of similar-calibre
weapons mounted beneath the lower wing outside the
propeller arc. With these changes the aircraft was designated
XP-4 (Model 58), and delivered on 27 July 1926,
but the 6.32m2 increase in gross wing area by
comparison with the PW-9 failed to compensate for the
370kg increase in loaded weight. The XP-4
proved to possess extremely unsatisfactory handling
characteristics and after a few hours flying the test programme
was abandoned.
| WEIGHTS |
| Take-off weight | 1656 kg | 3651 lb |
| Empty weight | 1262 kg | 2782 lb |
| DIMENSIONS |
| Wingspan | 9.75 m | 32 ft 0 in |
| Length | 7.29 m | 24 ft 11 in |
| Height | 2.69 m | 9 ft 10 in |
| Wing area | 28.71 m2 | 309.03 sq ft |
| PERFORMANCE |
| Max. speed | 259 km/h | 161 mph |
| Range | 603 km | 375 miles |
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