The final production PW-9D (the 16th) was retained by
Boeing for the experimental installation of a 600hp
water-cooled Curtiss Conqueror V-1570 engine and, as
the XP-7 (Model 93), was eventually delivered to the
USAAC on 4 September 1928. Distinguished from the
PW-9D by a shorter, deeper nose with a larger radiator,
the XP-7 enjoyed some success during trials, proving
the suitability of the Conqueror for fighter installation,
but proposals to build four service evaluation P-7s were
As the XP-7, the last production PW-9 was used
to test the Conqueror engine for fighter use.
abandoned when it was concluded that the basic PW-9
airframe had reached the limit of its development. The
XP-7, the last Boeing fighter biplane to employ a liquid-cooled
engine, was reconverted to PW-9D standards.
| Take-off weight||1479 kg||3261 lb|
| Empty weight||1053 kg||2321 lb|
| Wingspan||9.75 m||32 ft 0 in|
| Length||7.31 m||24 ft 0 in|
| Height||2.74 m||9 ft 0 in|
| Wing area||22.39 m2||241.00 sq ft|
| Max. speed||269 km/h||167 mph|
biplane to employ a liquid-cooled engine, was reconverted to PW-9D standards.
Boeing XP-7 / Model 93
Do you have any comments about this aircraft ?