Boulton Paul

Jos Heyman

ACCESS: Top Secret
15 February 2007
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Here is my first attempt to a Boulton Paul designations list.

P.3 Bobolink
P.6 Two seater built for aerodynamic research
P.7 Bourges
P.8 Atlantic
P.9 Single engined two-seat light aircraft
P.10 All steel biplane displayed at 1919 Paris Air Show. Not built.
P.12 Bodmin
P.15 Fitted with 2 Napier Lion II engines
P.25 Bugle
P.29 Sidestrand
P.31 Bittern
P.32 Night bomber to meet Spec. B.22/27, later abandoned due to delays and replaced by B.19/27.
P.33 Partridge
P.41 Phoenix II
P.64 Mailplane
P.71 Mailplane based on P.64. Two built.
P.75 Overstrand
P.76 Twin-engine two seat turret fighter to meet Spec. F.5/33. Not built.
P.80 Superstrand
P.81 To meet Spec. A.39/34 for an artillery spotting and reconnaissance aircraft. Not built.
P.82 Defiant
P.85 Version of P.82 Definant for FAA. Not built.
P.92 Design for a two-seat turret-armed fighter/ground attack aircraft to meet Air Ministry Spec. F11/37. Half scale model built as P.92/2
P.94 Turret-less version of Defiant. Not built.
P.99 Design to meet Spec. F.6/42 for a single seat fighter.
P.100 Design to meet Spec. F.6/42 for a single seat fighter.
P.108 Balliol
P.111 Delta wing research aircraft
P.114 Flight 17 September 1954, page 447, refers to a P.114 training aircraft similar to the Hunting Jet Provost. Considering the designation P.124, this may be a printing error.
P.119 Jet trainer wirh RR Derwent or Nene. Not built.
P.120 Delta wing experimental airline
P.123 Proposal to meet the requirements of the UB.109T, a cruise missile project. It was cancelled in 1953.
P.124 Design for a jet trainer similar to the Jet Provost.
P.130 Various proposals for VTOL aircraft in late 1954/early 1955
P.135 VTOL project of 1962. A 3/25 model was tested in a windtunnel.
P.141 The BP.141 was a January 1960 project for an air-driven fan-lift VTOL airliner for 40 passengers.
P.143 Development of the BP.141.
P.146 Proposal for a 96 passenger VTOL airliner..
Hello Jos,

Boulton Paul P-133: Naval search and strike aircraft with lift fans.,620.15.html
Reply #27
Bolton Paul Designations (from Putnam;s "BP aircraft since...")

P.1 Fighter. Project only
P.2 Fighter. Project only
P.3 Bobolink 1918 Fighter to Specification A.1a
P.4 Fighter. Project only
P.5 Hawk ABC Wasp powered fighter to Specification A.1a. Project only
P.6 1918 Experimental aircraft
P.7 Bourges 1918 Two-engined bomber to Specification A.2(b)
P.7b Bourges Two-engined bomber
P.8 Atlantic 1919 Single-engined long-range aircraft
P.9 1919 Single-engined two-seat lightplane
P.10 1919
P.11 Two-bay biplane powered by a 475 hp Napier Lion V to Specification XXI
P.12 Bodmin 1924 Experimental aircraft
P.13 Designation thought not to have been used
P.14 Possibly a biplane design dating from 1922
P.15 Bolton 1922 Fighter-bomber
P.16 A troop carrier dated in 10.1920 to Specification 5/20
P.17 A fleet spotter with the pilot forward of the engine
P.17a Layout with the engine forward of the pilot
P.18 1921 A preliminary scheme only for a reconnaissance aircraft, dated 06.1922
P.19 Design to Specification 15/21 for a twin-engined bomber
P.20 (All-Steel Military Aircraft) Army Co-operation aircraft
P.21 1921 A high-altitude photographic-reconnaissance aircraft dating from 10.1921
P.22 1921 Coastal torpedo aircraft from 10.1921
P.23 An amphibian
P.24 ?
P.25 Bugle Mk.I 1923 A bomber powered two Jupiter to Specification 30/22
P.25a Bugle Mk.II 1925 Variant with Napier Lions
P.26 ?
P.27 A twin-engined medium day bomber, powered by Napier Lions.
P.28 A single-engined day bomber landplane to Specification 10/23 powered by a Typhoon
P.29 Sidestrand Mk.I Prototype with two Napier Lion to Specification B.9/24
P.29a Sidestrand Mk.II / P.29a Sidestrand Mk.III Day bomber
Day bomber to Specification B.10/29
P.30 A single-seat fighter powered by a single Lioness.
P.31 Bittern Night fighter powered by a AS Lynx
P.31A 2nd aircraft with Townend ring
P.32 Heavy bomber powered by three Bristol Jupiter XF to Specification B.22/27
P.33 Partridge Fighter powered by a Bristol Jupiter VII to Specification F.9/26
P.34 A navalised version of the P.33 for Specification N.21/26 for a Fairey Flycatcher replacement
P.35 1928 A large two-seat biplane powered by a Bristol Jupiter VII with a COW 1 ½ pdr cannon to Specification F.29/27. Dated 02.1928
P.36 An airliner version of the P.32 heavy bomber
P.37 Streamline 1929 A high-speed day bomber dated 09.1929. It was to be powered by two RR F.11S engibes.
P.38 1928 This was an aerial survay monoplane with three DH Gipsy engines, designed in 12.1928
P.39 A vary large monoplane flying-boat powered by six RR F.11 engines in three tandem pairs carried on pylons above the wing.
P.40 1929 This was a biplane troop-carrier designed in 01.1929 to Specification C.16/28, and powered by three Bristol Mercury V reared engines
P.41 Phoenix Lightplane
P.42 This was a civil general purpose biplane landplane to Specification 6/29 powered by three supercharged AS Lynx engines.
P.42A 1929 Was a monoplane with the third engine on a pylon.
P.43 1929 This was a four-seat cabin aircraft powered by three Cirrus Hermes engines. Dated 10.1929
P.44 1929 This was a four-seat light aircraft powered by a single ADC Airsix engine. Dated 09.1929
P.45 This was a twin-engined aircraft, with five seat, for Imperial Airways dated 11.1929. A choice of engine was offered, either Jupiter XIFs or Jaguar Vis or Lion Vs
P.46 This was a version of the P.45 salon, but with two geared Lynx engines
P.47 1929 This was high-speed mail-carrier developed from the sesquiplane P.37 bomber, in 12.1929, and powered by two RR “F” type engines.
P.48 1930 This was a four-engined airliner for Imperial Airways. It was to be powered by four Jupiter XIF or Jaguar VI engines. Dated 02.1930
P.49 This was a further version of the P.37/P.47, but was single-seat high-speed racing aircarft. It was powered by a single Gipsy engine.
P.50 1930 This was a two-seat general-purpose monoplane dated 04.1930. it was to be powered by an AS geared Panther
P.51 This was six-passengers monoplane powered by the Panther
P.52 This was a twin-engined bomber powered by two Panthers
P.53 This was a reconnaissance seaplane version of the P.50 also powered by the AS Panther
P.54 1930 This was a five-passenger, twin-engined “Saloon” biplane, wiyj two Panther engines for Imperial Airways dated 05.1930
P.55 This was designed in 07.1930 to Specification 26/28 for a civil aircraft to operate from confined spaces. It was a single-engined biplan, powered by a Panther engine.
P.56 This was streamlined mail-carrier powered by two AS Panthers
P.57 1930 This was a development of the P.29 for the Irish Free State, for use as a general purpose aircraft/bomber. It featured extra strimlining and two geared Jaguar engined. Dated 08.1930
P.58 1930 A three-seat fleet spotter, with optional wheel or floats to Specification S.9/30 powered by a supercharged Panther. Dated 09.1930
P.58A Variant powered by a RR F12 engine
P.58B Variant with a narrow-chord cranked low wing
P.59 Three-engined transport for Imperial Airways, powered by a geared Jaguars or Panther engines
P.60 This was a photographic aircraft for RCAF. Development of the P.29. it was powered by two geared Jaguars.
P.61 This was streamlined mail-carrier, powered by a two Jupiter XFBs
P.62 This was streamlined day bomber. Derivated from P.29
P.62A Was civil transport version
P.63 It was high-speed interceptor fighter powered by two Napier Rapiers.
P.64 Mail-Carrier Mailplane powered by two Bristol Pegasus IM2 to Specification 21/28
P.65 This was seaplane version of P.64 for AB Aerotransportof Sweden. It was a variety engines, either Jupiter XFA or Jupiter XFAM or Panther M.S.
P.66 1931 This was general purpose shoulder-wing monoplane to Specification G.4/31, offered with a Jupiter XFAM or XFBM or a Panther engine shrouded by a Townend ring.
P.67 Twin-engined single-seat monoplane fighter to Specification F.7/30
P.68 Was an eight-seat passenger aircraft with four Popjoy engines
P.69 Was based on an enlarged P.64 as bomber/transport to Specification C.26/31 with two Pegasus engines.
P.70 This was bomber with retractable power-operated dorsal turret to Specification B.9/32 based ob P.64
P.71 Feederliner Mail and passenger aircraft powered by two AS Jaguar IV
P.72 This was a twin-engined two-seat fighter, powered by two Bristol Pegasus radials.
P.73 Was a light bomber to Specification P.27/32 as a Hawker Hart replacement
P.74A Was a three-seat fighter armed with a turret to Specification F.22/33 with Narier Rapier engines
P.74B Versions with a wider rear fuselage
P.74C Versions with a Pegasus IV engines
P.74D Versions with a Pegasus IV engines
P.75 Overstrand Bomber. Prototype converted from P.29a as Sidestrand Mk.V to Specification B.29/33. production butch ordered to Specification B.23/34
P.76 Twin-engined two-seat fighter with a gun turret to Specification F.5/33. Powered by two Napier Rapier H or Bristol Perasus radials.
P.77 This was a version of the Overstrand converted for coastal reconnaissance duties
P.78 Day and night bomber powered by two Pegasus engines
P.79 Twin-engined heavy bomber to Specification B.3/34. It was a low-wing monoplane powered by two Bristol Perseus sleeve-valve engined.
P.80 Superstrand Twin-engined bomber development of the P.75 powered by two Pegasus IV engines with variable-pitch propellers and the retraclable undercarriage.
P.81 Army co-operation aircraft to Specification A.39/34 to find a replacement for the Hawker Audax
P.82 Defiant Fighter to Specification F.9/35
P.83 This was a shore-based torpedo bomber designed to Specification M.15/35
P.84 This was a shore-based general reconnaissance aircraft to Specification G.24/35
P.85 Turret fighter, version P.82 powered by Bristol Hercules HE-ISM engine to Specification O.30/35
P.86 A general reconnaissance/torpedo bomber to Specifications M.15/35 and G.24/35. It was powered by two Bristol Aquila AES-SM engines.
P.87 This was a heavy bomber powered by two (modified) Merlin engines
P.88A 1935 Single-seat fighter armed with four 20 mm cannon to Specification F.37/35 dated 05.1935. Powered by a Hercules HE-ISM engine.
P.88B Variant with RR Vulture engine.
P.89 Cannon –armed fighter project to Specification F.9/37. A twin-engined two-seater armed with four 20 mm cannon. It was to be powered by two modified RR Kestrel XVI engines.
P.90 This was designed to Specification B.12/36 which prodused the Stirling, and was powered by four RR Kestrel KV26 engines.
P.91 This was designed to Specification P.13/36 which prodused the Manchester, and was powered by two RR Vulture engines.
P.92 Heavy fighter to Specification F.11/37
P.93 This number was assigned to Blackburn Roc, for which Bolton Paul did all the detail design work, and produced all the prototypes and production examples
P.94 This was a company proposal for a single-seat version of a Defiant, powered by a Merlin XX
P.95 This was a single-engined two-seat bomber to Specification B.20/40, capable of close-support bombing and tactical reconnaissance. It was powered by a Bristol Hercules VI.
P.96A A two-seat aircraft armed with six 20 mm cannon to Specification F.18/40. It could be powered by a Napier Sabre NS.6SM with no turret
P.96B A two-seat aircraft armed with six 20 mm cannon to Specification F.18/40. It could be powered by a Napier Sabre NS.6SM with a turret
P.96C A two-seat aircraft armed with six 20 mm cannon to Specification F.18/40. It could be powered by a Napier Sabre NS.6SM with a turret
P.96D A two-seat aircraft armed with six 20 mm cannon to Specification F.18/40. It could be powered by a Bristol Centaurus CE.4SM with or without turret
P.97A A twin-boom aircraft armed with six 20 mm cannon to Specification F.18/40. It could be powered by a two Napier Sabre or two RR Vulture engines without the turret
P.97B A twin-boom aircraft armed with six 20 mm cannon to Specification F.18/40. It could be powered by a two Napier Sabre or two RR Vulture engines with the turret
P.98 Fast climbing fighter-bomber to Specification F.6/42, powered by a Griffon, with the engine driving contra-rotating pusher propeller
P.99 A Griffon-powered aircraft with twin-boom layout to Specification F.6/42. The engine was a pusher driving contra-rotating propellers.
P.100 Fighter to Specification F.6/42
P.101 Biplane fighter to Specification F.6/42. There was a single tractor propeller, powered by a Bristol Centaurus 12 SM (Mod.)
P.102 The Fairey Barracuda Mk.II (later Mk.V) was redesigned to take a Whitle W.2b/37 turbojet as a power egg in the rear fuselage.
P.103A A lightweight naval fighter to Specification N.7/43, powered by a RR Griffon RG.5SM
P.103B A lightweight naval fighter to Specification N.7/43, powered by a Bristol Centaurus CE.12SM
P.104 A lightweight naval tail-first fighter to Specification N.7/43, powered by a RR Griffon RG.5SM driving a pusher propeller
P.105 1944 Naval strike aircraft powered by a Bristol Centaurus CE.12SM driving a contra-rotating propeller
P.106A Three-seat training aircraft to Specification T.23/43, powered by a Gipsy Queen II or III
P.106B Version
P.106C Tandem two-seat layout
P.107 This was a two-seat long-range escort fighter powered by a single Bristol Centaurus CE.12SM driving contra-rotating three-blade propeller
P.108 Balliol
P.108 Sea Balliol Training aircraft to Specification T.7/45 as propeller-turbine powered aircraft (prototypes only) and to Specification T.14/47 as Merlin powered production version
P.109 This was Perseus-engined version of the P.108, requered in the first issue of Specification T.7/45
P.110 Civil light three-seat pusher aircraft powered by a single Cirrus Minor II engine.
P.111 Experimental aircraft to Specification E.27/46
P.112 Three-seat elementary trainer based on P.108 fuselage with new wing powered by a Alvis Leonides IVM
P.112A Version powered by a P&W R-1340
P.113A Supersonic aircraft powered by a RR Avon engine
P.113S Version powered by a AS Sapphire engine
P.114A Twin-engined transonic research aircraft powered by two Avons
P.114S Version powered by two AS Sapphire engines
P.115 This was piston-powered basic trainer to Specification T.16/48 powered by a 400 hp DH Gipsy Queen 71
P.116 This was piston-powered basic trainer to Specification T.16/48 powered by a 295 hp DH Gipsy Queen 50
P.117 A wing-controlled aerodyne. It was not specific aircraft
P.118 This was an aircraft with highly swept wing, powered by a RR Nene
P.119 Two-seat jet-powered advanced trainer with RR Nene
P.119N A deck0landing version
P.120 Experimental aircraft to Specification E.27/49
P.121 This was a single-seat supersonic fighter to Specification ER.110T, powered by two RA.8 engines.
P.122 This was a rocket-propelled interceptor, powered by an AS Screamer.
P.123 This was short-range expendible bomber to Specification UB.109T. It was a swept wing, V-tailled aircraft powered by two wing-mounting RR RB.93 expendable turbojets
P.124 A basic jet trainer for the RAF. It was a side-by-side two-seat aircraft powered by an AS Viper AS.V.5
P.125 This was a straightforward jet-powered version of the P.108, with the Merlin engine in the nose simply replaced by a RR Derwent
P.127 This was a supersonic interceptor
P.128 This was a projected research aircraft for AM Specification ER.134T powered by two AS Sapphire engines
P.129 It’s projected research aircraft powered by two Viper AS.V.5 or Turbomeca Marbore turbojets and a Snarler lox/alcohol rocket
P.130 This was a group of proposals designated Mk.1 to Mk.12 for VTOL aircraft having fanlift.
P.131 This was the P.124 advanced jet trainer adapted for the requirement of the RAAF
P.132 It was a swept-delta wing VTOL aircraft, designed to MoS Specification ER.166D powered by four AS Viper turbojets.
P.133 1956 It was a single-seat VTOL fighter powered by two DH Gyron Juniors and six fans dated 06.1956
P.133A 1956 Variant with only four lift fans dated 08.1956
P.133B 1956 Two-seat naval search and strike aircraft with only the Gyron Junior engines dated 11.1956
P.134 This was a single-seat VTOL aircraft powered by two Bristol Orpheus B.Or.11 turbojets
P.135A This was development of the P.132 research aircraft powered by two Bristol Orpheys B.Or.12 engines
P.135B Other wing
P.136 1957 This was a single-seat research aircraft powered by two Orpheus engines with six RR RB.108 ducted fans in a central row, dated 08.1957
P.137 A VTOL research aircraft with two DH Gyron Juniors.
P.138 A civil VTOL proposal, 32-seat airliner powered by four Bristol Orpheus engines
P.139 This was a single-seat research aircraft dated 11.1957, powered by two Bristol Orpheus
P.140 1957 This was a proposal for 72/80-seat VTOL airliner powered by eight Bristol Orpheus B.Or.12 engines dated 10.1957. the twelve lift fans were to be mounted rwo in each outer wing, and two rows of four in the wing roots
P.141 1960 This was a 40-seat straight wing airliner dated 01.1960 with six RR RB.108 engines in two triple pods , and four engines in tip pods driving the 24 lift fans
P.142 1958 This was a VTOL research aircraft dated 04.1958
P.143 This was to be a VTOL 46/52-seat civil transport powered by ten RR RB.144 engines
P.144 1959 This was a VTOL airborne vehicle, drawn in 02.1959 and powered by two RR RB.144 engines, with lift provided by four fans
P.144A 1959 Version with a single RB.155
P.145 This was a VTOL twin-boom transport powered by four RR RB.154 engines and twelve RB.155 lift wingines
P.146 This was a 96-seat VTOL civil airliner powered by three modified RB.163 hypass engines with eighteen RB.155 lift engines
P.147 A ground-borne military vehicle having a limited airborne capability
P.148 A low profile fuel tanker, able to be transported by air

some explanations;

P.1 & P.2 single seat fighter biplane with Bently engine.
P.4 also single seat night fighter biplane.
P.11 two seat amphibian.

P.126 was a fighter with very thin,stiff wing and resemble in its shape to
the Bristol Model-188.
my dear Lucamax,

here is the Boulton Paul P.70.


  • P.70.png
    179.7 KB · Views: 195
The book British Secret Projects 4 shows a very nice drawing of the P.84, also describes at the same time that the P.84 and P.86 should have been very similar. Are there any representations of these two projects?

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