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Potez VIII

January 01, 1970

The Potez VIII was a French training aircraft which first flew in 1920. Originally it had a very unusual vertical inline engine and a four-wheeled undercarriage, though the production version was more conventional.

Potez VIII
With Potez engine, at the 1920 Paris Salon
Role Training and touring aircraft
National origin France
Manufacturer Potez
First flight 9 April 1920
Number built c.15

Design and development edit

The Potez VIII as first displayed, unflown, at the 1919 Paris Salon was a conventional small, single engine aircraft of its time apart from a most unusual engine and an unconventional undercarriage. It was a single bay biplane with rectangular plan wings mounted without stagger but with marked dihedral and braced with pair of parallel, airfoil section interplane struts. A pair of inverted V cabane struts, parallel to each other, joined the central section of the upper wing to the upper fuselage longerons. There were ailerons on the upper wing only. The wings were duralumin two spar structures with fabric covering.[1][2]

The Potez VIII had a simple, flat-sided fuselage with a wooden structure and plywood skinning. There were tandem open cockpits, the forward one under the upper wing, which was mounted well above it, and the other just aft of the trailing edge, which had a rounded cut-out to assist the pilot's upward vision. The empennage was conventional, with a tailplane on the upper fuselage and a broad chord, swept-edge fin wire braced to it.[1] The tail structure was similar to that of the wing, with a metal frame and fabric covering.[2]

The engine of the 1919 aircraft was also a Potez design, the 41 kW (55 hp) A-4. This was a four-cylinder inline built to run with its crankshaft vertical. It was mounted with its exposed cylinders pointing forwards for cooling and had gearing that turned the output through 90° to drive a two-blade propeller. Although the Potez A-4 was unsuccessful, its configuration produced the high power line and low centre of gravity of later inverted inline engines, allowing a shorter undercarriage, easier access to the cockpits and a better forward view over a shorter, lower nose than its inline contemporaries. The high propeller shaft also allowed a shorter undercarriage; a four-wheeled unit protected the propeller tips from contact with the ground.[1]

The A-4 engined Potez VIII first flew on 19 April 1920.[3] When its engine was recognised as a failure the A-4 was replaced by a six-cylinder Anzani radial engine, mounted uncowled in the nose. An early version produced 37 kW (50 hp) and a later variant 52 kW (70 hp).[2] Initially the four wheel undercarriage was retained[3] but when the Potez VIII appeared at the 1922 Paris Salon it had more conventional two wheel gear. The wheels were on a single axle. From each end of the axle a strut ran to the underside of the forward fuselage, acting together with a vertical telescopic, rubber damped shock absorber.[2][4] At least one example flew as a floatplane, designated Potez VIII H (H for hydravion or water plane). It had a single, central float and a small, airfoil section stabilizing float under each wing.[3][5]

A side-by-side version was also built and designated the Potez VIII R; it was a little heavier, with a wider fuselage and powered by a fully cowled 80 hp (60 kW) Le Rhone 9C engine. It returned to the four wheel undercarriage.[6][7]

Reconstructed pre-World War II civil registers[8] suggest about fifteen powered Potez VIIIs were built. There was also a glider version, the Potez VIII P (P for planeur or glider) with a smooth aluminium nosecap in place of the engine. This was slightly (150 mm (5.9 in)) longer and lighter with an empty weight of 110 kg (243 lb) compared with the 330 kg (728 lb) of the Anzani powered version. It was the overall winner at the First Glider Congress, held in Clermont-Ferrand, which ended on 30 August 1922.[9]

The powered version also had competition success, coming second in the first La Coupe de Consummation d'Aviation Zénith (The Zénith Cup for Aircraft Fuel Consumption), based on a return flight from Paris to Lyon flown over 21–22 August 1923. The deciding parameter was the ratio of weight of fuel used to payload. The Potez scored 0.616, the winner, a Farman F.90, 0.473.[10]

Four Potez VIIIs were registered in Bulgaria.[11]

Variants edit

 
Anzani powered, two wheel version
VIII prototype
Potez A-4 engine, 41 kW (55 hp).[1]
VIII
Anzani 6A engine, 37 kW (50 hp)[2]
VIIIA
Anzani 6A engine, 52 kW (70 hp).[2][4]
VIII H
Floatplane.[3]
VIII P
Glider.[9]
VIII R
Side by side seating, Le Rhône 9C engine, 67 kW (90 hp).[6][7]

Specifications (70 hp Anzani) edit

 
Potez VIII R 3-view drawing from L'Aéronautique January 1921

Data from Aérophile - Salon 1924, p.23[2]

General characteristics

  • Crew: Two
  • Length: 5.72 m (18 ft 9 in)
  • Upper wingspan: 8.0 m (26 ft 3 in)
  • Lower wingspan: 6.85 m (22 ft 6 in)
  • Height: 2.50 m (8 ft 2 in)
  • Wing area: 20 m2 (220 sq ft)
  • Empty weight: 330 kg (728 lb)
  • Gross weight: 555 kg (1,224 lb)
  • Fuel capacity: 60 L (13 imp gal; 16 US gal)
  • Powerplant: 1 × Anzani 6-cylinder, two-row air-cooled radial, 52 kW (70 hp)
  • Propellers: 2-bladed

Performance

  • Maximum speed: 145 km/h (90 mph, 78 kn)
  • Service ceiling: 4,000 m (13,000 ft)
  • Wing loading: 27.5 kg/m2 (5.6 lb/sq ft)

References edit

  1. ^ a b c d "IV Paris Aero Show (1919): Henry Potez Machines". Flight. Vol. XII, no. 3. 15 January 1920. pp. 69–70.
  2. ^ a b c d e f g "Les Avions au IX Salon de l'Aéronautique (1924) - Stand Potez". L'Aérophile. December 1924. p. 23.
  3. ^ a b c d "Potez VIII". Retrieved 13 September 2014.
  4. ^ a b "VII Paris Salon (1922), Henry Potez, Levallois-Perret (Seine)". Flight. Vol. XV, no. 4. 25 January 1923. p. 50.
  5. ^ "Potez VIII H". Retrieved 22 September 2014.
  6. ^ a b "Potez VIII R". Retrieved 22 September 2014.
  7. ^ a b Hirschauer, Louis; Dollfus, Charles, eds. (1921). L'Année Aéronautique: 1920-1921. Paris: Dunod. p. 33.
  8. ^ Malcolm Fillmore (12 February 2011). "Air-Britain - Pre-War French registers". Retrieved 19 September 2014.
  9. ^ a b "Planeur Potez (type VIII P)". L'Aérophile. December 1922. p. 310.
  10. ^ "La Coupe de Consummation d'Aviation Zénith". L'Aérophile. August 1923. pp. 235–6.
  11. ^ "Pre-War Bulgarian Civil Aircraft Register". Retrieved 23 September 2014.

Bibliography edit

  • Andersson, Lennart (July 1998). "Histoire de l'aéronautique persane, 1921–1941: La première aviation du Chah d'Iran" [History of the Persian Air Force, 1921–1941: The First Aircraft of the Shah of Iran]. Avions: Toute l'aéronautique et son histoire (in French) (76): 2–12. ISSN 1243-8650.
  • Anderson, Lennart (November–December 2019). "La renaissance de l'aviation militair bulgare dans les années vingt" [The Rebirth of Bulgarian Military Aviation in the Twenties]. Avions (in French) (232): 52–66. ISSN 1243-8650.
  • Coroller, Jean-Louis (September 1998). "Les premièrs avions Henry Potez (première partie)" [The First Aircraft of Henry Potez]. Avions: Toute l'aéronautique et son histoire (in French) (66): 8–14. ISSN 1243-8650.

January 01, 1970
potez, viii, french, training, aircraft, which, first, flew, 1920, originally, very, unusual, vertical, inline, engine, four, wheeled, undercarriage, though, production, version, more, conventional, with, potez, engine, 1920, paris, salon, role, training, tour. The Potez VIII was a French training aircraft which first flew in 1920 Originally it had a very unusual vertical inline engine and a four wheeled undercarriage though the production version was more conventional Potez VIII With Potez engine at the 1920 Paris Salon Role Training and touring aircraft National origin France Manufacturer Potez First flight 9 April 1920 Number built c 15 Contents 1 Design and development 2 Variants 3 Specifications 70 hp Anzani 4 References 5 BibliographyDesign and development editThe Potez VIII as first displayed unflown at the 1919 Paris Salon was a conventional small single engine aircraft of its time apart from a most unusual engine and an unconventional undercarriage It was a single bay biplane with rectangular plan wings mounted without stagger but with marked dihedral and braced with pair of parallel airfoil section interplane struts A pair of inverted V cabane struts parallel to each other joined the central section of the upper wing to the upper fuselage longerons There were ailerons on the upper wing only The wings were duralumin two spar structures with fabric covering 1 2 The Potez VIII had a simple flat sided fuselage with a wooden structure and plywood skinning There were tandem open cockpits the forward one under the upper wing which was mounted well above it and the other just aft of the trailing edge which had a rounded cut out to assist the pilot s upward vision The empennage was conventional with a tailplane on the upper fuselage and a broad chord swept edge fin wire braced to it 1 The tail structure was similar to that of the wing with a metal frame and fabric covering 2 The engine of the 1919 aircraft was also a Potez design the 41 kW 55 hp A 4 This was a four cylinder inline built to run with its crankshaft vertical It was mounted with its exposed cylinders pointing forwards for cooling and had gearing that turned the output through 90 to drive a two blade propeller Although the Potez A 4 was unsuccessful its configuration produced the high power line and low centre of gravity of later inverted inline engines allowing a shorter undercarriage easier access to the cockpits and a better forward view over a shorter lower nose than its inline contemporaries The high propeller shaft also allowed a shorter undercarriage a four wheeled unit protected the propeller tips from contact with the ground 1 The A 4 engined Potez VIII first flew on 19 April 1920 3 When its engine was recognised as a failure the A 4 was replaced by a six cylinder Anzani radial engine mounted uncowled in the nose An early version produced 37 kW 50 hp and a later variant 52 kW 70 hp 2 Initially the four wheel undercarriage was retained 3 but when the Potez VIII appeared at the 1922 Paris Salon it had more conventional two wheel gear The wheels were on a single axle From each end of the axle a strut ran to the underside of the forward fuselage acting together with a vertical telescopic rubber damped shock absorber 2 4 At least one example flew as a floatplane designated Potez VIII H H for hydravion or water plane It had a single central float and a small airfoil section stabilizing float under each wing 3 5 A side by side version was also built and designated the Potez VIII R it was a little heavier with a wider fuselage and powered by a fully cowled 80 hp 60 kW Le Rhone 9C engine It returned to the four wheel undercarriage 6 7 Reconstructed pre World War II civil registers 8 suggest about fifteen powered Potez VIIIs were built There was also a glider version the Potez VIII P P for planeur or glider with a smooth aluminium nosecap in place of the engine This was slightly 150 mm 5 9 in longer and lighter with an empty weight of 110 kg 243 lb compared with the 330 kg 728 lb of the Anzani powered version It was the overall winner at the First Glider Congress held in Clermont Ferrand which ended on 30 August 1922 9 The powered version also had competition success coming second in the first La Coupe de Consummation d Aviation Zenith The Zenith Cup for Aircraft Fuel Consumption based on a return flight from Paris to Lyon flown over 21 22 August 1923 The deciding parameter was the ratio of weight of fuel used to payload The Potez scored 0 616 the winner a Farman F 90 0 473 10 Four Potez VIIIs were registered in Bulgaria 11 Variants edit nbsp Anzani powered two wheel version VIII prototype Potez A 4 engine 41 kW 55 hp 1 VIII Anzani 6A engine 37 kW 50 hp 2 VIIIA Anzani 6A engine 52 kW 70 hp 2 4 VIII H Floatplane 3 VIII P Glider 9 VIII R Side by side seating Le Rhone 9C engine 67 kW 90 hp 6 7 Specifications 70 hp Anzani edit nbsp Potez VIII R 3 view drawing from L Aeronautique January 1921 Data from Aerophile Salon 1924 p 23 2 General characteristicsCrew Two Length 5 72 m 18 ft 9 in Upper wingspan 8 0 m 26 ft 3 in Lower wingspan 6 85 m 22 ft 6 in Height 2 50 m 8 ft 2 in Wing area 20 m2 220 sq ft Empty weight 330 kg 728 lb Gross weight 555 kg 1 224 lb Fuel capacity 60 L 13 imp gal 16 US gal Powerplant 1 Anzani 6 cylinder two row air cooled radial 52 kW 70 hp Propellers 2 bladed Performance Maximum speed 145 km h 90 mph 78 kn Service ceiling 4 000 m 13 000 ft Wing loading 27 5 kg m2 5 6 lb sq ft References edit a b c d IV Paris Aero Show 1919 Henry Potez Machines Flight Vol XII no 3 15 January 1920 pp 69 70 a b c d e f g Les Avions au IX Salon de l Aeronautique 1924 Stand Potez L Aerophile December 1924 p 23 a b c d Potez VIII Retrieved 13 September 2014 a b VII Paris Salon 1922 Henry Potez Levallois Perret Seine Flight Vol XV no 4 25 January 1923 p 50 Potez VIII H Retrieved 22 September 2014 a b Potez VIII R Retrieved 22 September 2014 a b Hirschauer Louis Dollfus Charles eds 1921 L Annee Aeronautique 1920 1921 Paris Dunod p 33 Malcolm Fillmore 12 February 2011 Air Britain Pre War French registers Retrieved 19 September 2014 a b Planeur Potez type VIII P L Aerophile December 1922 p 310 La Coupe de Consummation d Aviation Zenith L Aerophile August 1923 pp 235 6 Pre War Bulgarian Civil Aircraft Register Retrieved 23 September 2014 Bibliography editAndersson Lennart July 1998 Histoire de l aeronautique persane 1921 1941 La premiere aviation du Chah d Iran History of the Persian Air Force 1921 1941 The First Aircraft of the Shah of Iran Avions Toute l aeronautique et son histoire in French 76 2 12 ISSN 1243 8650 Anderson Lennart November December 2019 La renaissance de l aviation militair bulgare dans les annees vingt The Rebirth of Bulgarian Military Aviation in the Twenties Avions in French 232 52 66 ISSN 1243 8650 Coroller Jean Louis September 1998 Les premiers avions Henry Potez premiere partie The First Aircraft of Henry Potez Avions Toute l aeronautique et son histoire in French 66 8 14 ISSN 1243 8650 Retrieved from https en wikipedia org w index php title Potez VIII amp oldid 1126684036, wikipedia, wiki, book, books, library,

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