- Development
- Specifications (P.64 Mailplane)
- See also
- References
{{Use dmy dates|date=December 2016}}{{Use British English|date=December 2016}}| name = P.64 Mailplane | image =Boulton Paul P.64 Mailplane L'Aerophile August 1933.jpg | caption = }}{{Infobox Aircraft Type | type = Mail plane/Light Transport | manufacturer = Boulton & Paul Ltd | designer = J D North | first flight = March 1933 | introduced = | retired = October 1933 | produced = | number built = 1 | status = | unit cost = | primary user = | more users = | developed from = | variants with their own articles = | developed into = Boulton Paul P.71A
}} |
The Boulton & Paul P.64 Mailplane also known as the Mail-Carrier was a 1930s British twin-engined all-metal biplane transport aircraft designed for Imperial Airways and built by Boulton & Paul Ltd. DevelopmentThe airline had a requirement, which was translated into Air Ministry specification 21/28, for a mailplane to carry a {{convert|1000|lb|kg}} payload on a {{convert|1000|mi|km}} leg at a speed of at least {{convert|150|mph|km/h}}.[1] Boulton & Paul designed and constructed the prototype P.64 Mailplane to address these requirements.[1] The P.64 was a twin-engine two-bay equi-span biplane. It was powered by two Bristol Pegasus IM2 supercharged radial engines rated at {{convert|555|hp|kW}} driving two-bladed fixed pitch propellers and mounted under the upper wings.[2] The aircraft (registered G-ABYK) first flew in March 1933 at the company Norwich. It was not a success, deemed to be expensive and unsatisfactory. It was destroyed during trials at Martlesham Heath when it struck the ground during an unexplained dive on 21 October 1933. The company then addressed the specification's requirements with a new design transport aircraft which was lighter, slimmer and longer (the Boulton Paul P.71A). Specifications (P.64 Mailplane){{Aircraft specs
|ref=Boulton Paul Aircraft since 1915[3]
|prime units?=imp
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|crew=3 (2 pilots plus navigator or radio operator)
|capacity=
|length m=
|length ft=42
|length in=6
|length note=
|span m=
|span ft=54
|span in=
|span note=
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|swept m=
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|dia m=
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|width m=
|width ft=
|width in=
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|height m=
|height ft=13
|height in=
|height note=
|wing area sqm=
|wing area sqft=756
|wing area note=
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|swept area sqft=
|swept area note=
|volume m3=
|volume ft3=
|volume note=
|aspect ratio=
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|empty weight kg=
|empty weight lb=7,008
|empty weight note=
|gross weight kg=
|gross weight lb=11,267
|gross weight note=
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity=
|lift kg=
|lift lb=
|lift note=
|more general=
|eng1 number=2
|eng1 name=Bristol Pegasus I.M2
|eng1 type=9-cyl. air-cooled radial piston engine
|eng1 kw=
|eng1 hp=555
|eng1 kn=
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|max speed kmh=
|max speed mph=185
|max speed kts=
|max speed note=at {{convert|5,000|ft|m|abbr=on|0}}
|max speed mach=
|cruise speed kmh=
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|never exceed speed kmh=
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|range km=
|range miles=1,000
|range nmi=
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|ceiling m=
|ceiling ft=22,500
|ceiling note=
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|climb rate ms=
|climb rate ftmin=1,400
|climb rate note=
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|avionics=
}}
See also{{aircontent
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}}References- Notes
1. ^1 {{Harvnb|Stroud Aeroplane Monthly August 1986|p=433}}
2. ^{{Harvnb|Brew|1993|p=217}}
3. ^{{Harvnb|Brew|1993|pp=218, 222}}
- Bibliography
- {{cite book |last= |first= |authorlink= |coauthors= |title= The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985)|year= |publisher= Orbis Publishing|location= |issn=}}
- {{cite book|last=Brew|first=Alec|title=Boulton Paul Aircraft since 1915|publisher=Putnam & Company Ltd.|location=London|year=1993|pages=216–222|isbn=0-85177-860-7|ref=harv}}
- {{cite book |last= Jackson|first= A.J.|authorlink= |coauthors= |title= British Civil Aircraft since 1919|year= 1974|publisher= Putnam|location= London|isbn=0-370-10014-X |ref=harv}}
- {{cite magazine|last=Stroud|first=John|title=Wings of Peace: Boulton & Paul P.64 and P.71A|magazine=Aeroplane Monthly|date=August 1986 |volume=14| issue=8|pages=432–436|issn=0143-7240|ref={{Harvid|Stroud Aeroplane Monthly August 1986}}}}
{{commons category|Boulton Paul}}{{Boulton Paul aircraft}}{{DEFAULTSORT:Boulton and Paul Mailplane}} 5 : Boulton Paul aircraft|British mailplanes 1930–1939|Twin-engined tractor aircraft|Biplanes|Aircraft first flown in 1933 |