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In 1933 Boulton & Paul built a twin-engine all-metal biplane under a contract awarded by Imperial Airways. The airline had a requirement for a mailplane capable of carrying a 454kg payload over a 1609km range at reasonable speed, and the company considered its Boulton & Paul P.64 Mailplane to be the answer. Unfortunately it was both expensive and unsatisfactory. First flown at the company's airfield at Mousehold, Norwich, in March 1933, it lasted barely seven months before being destroyed in an unexplained fatal crash during trials at Martlesham Heath in October.
| ENGINE | 2 x 555hp Bristol Pegasus I.M.2 |
| WEIGHTS |
| Take-off weight | 5115 kg | 11277 lb |
| Empty weight | 3182 kg | 7015 lb |
| DIMENSIONS |
| Wingspan | 16.46 m | 54 ft 0 in |
| Length | 12.95 m | 43 ft 6 in |
| Height | 3.96 m | 13 ft 0 in |
| Wing area | 70.23 m2 | 755.95 sq ft |
| PERFORMANCE |
| Max. speed | 298 km/h | 185 mph |
| Ceiling | 6858 m | 22500 ft |
| Range | 1610 km | 1000 miles |
 | A three-view drawing (900 x 766) |
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