The Gregor FDB-1 was a Canadian biplanefighter, designed in 1938 by Michael Gregor and manufactured by Canadian Car and Foundry. Despite having some advanced design features such as flush rivetted all-metal construction and a retractable undercarriage, the final generation of biplane fighters was being supplanted by monoplanes and the Gregor FDB-1 was obsolete before it flew. Despite the Royal Canadian Air Force's desperation for modern fighters, the sole example remained unsold and was eventually lost in a fire in 1945. The Gregor FDB-1's model designation stood for Fighter Dive Bomber indicating its intended roles.
Gregor FDB-1
L-R: Test Pilot George Ayde, Can-Car rep David Boyd and designer Michael Gregor
In 1938, Georgian expatriate designer Mikheil Grigorashvili (anglicized as Michael Gregor) joined with Canadian Car and Foundry, which at that time was Canada's leading manufacturer of railroad rolling stock. He was hired to design a fighter. They wanted to enter the aircraft market, but had no experience in that industry. Instead of creating their own designs, Can-Car was producing aircraft under license that had been designed elsewhere. In 1936, Grumman and Canadian Car & Foundry or "Can-Car" concluded an agreement for production of 50 Grumman SF-1 biplane carrier fighters known as GE-23s or Grumman Export 23s, to be built in Canada. There were still some who doubted the merits of the monoplane over the biplane in 1938, and Michael Gregor was one of them. All the major powers still operated biplanes in front line fighter units, however they were being replaced with monoplanes in every case.
The hydraulically operated landing gear retracted into wells on the sides of the fuselage ahead of the lower wing. The fuselage of the Model 10 FDB-I was a monocoque shell of circular cross section with a flush-rivetedaluminumstressed-skin. 95 US gallons (360 litres; 79 imperial gallons) of fuel was carried in a pair of semicircular tanks mounted side-by-side between the wheel wells. The structure was stressed 60 percent above requirements. A pair of fuselage-mounted .50 cal. machine guns, synchronized to fire through the Hamilton Standard propeller's disk, were part of the design, but the armament was never installed. Additionally, two 116 lb (53 kg) bombs could be carried, one under each lower wing.[1] The cockpit was enclosed with a rearward sliding canopy and the engine was faired in with a NACA cowling reminiscent of the Seversky monoplane fighters that Gregor had worked on. Among the new devices incorporated in the FDB-1 was an anti-spin parachute in the tailcone. The pilot activated it from the cockpit with a switch that opened the cone, deployed the chute and released the connecting cable.[2]
The metal wing structure was fabric covered behind the front spar as were the metal-framed control surfaces. The top wing featured full span slats, plus all-metal split flaps between the wing roots and ailerons. The bottom wing also incorporated split flaps. The center section of the top wing curved down to meet the fuselage, in a gull-wing configuration like earlier Polish and Soviet fighters such as the Polikarpov I-153. The wings were braced with "V" interplane struts. Instead of flying and landing wires, a single strut ran between the root of the top wing and the foot of the V strut on the lower wing on each side. Torque tubes moved the control surfaces, except for the rudder, which was partially operated by cables.
Gregor FDB-1 being tested, December 1938.
DevelopmentEdit
A wood wind tunnel model was sent to Hawker Aircraft in England for testing early in 1938, and construction of the prototype began in Thunder Bay shortly thereafter, with it completed in December 1938, "amid an atmosphere of war jitters, well salted with tales of German spies visiting the factory in disguise."[3] When rolled out, the FDB-1 c/n 201 was registered CF-BMB, with the letters and ten horizontal rudder stripes in white over a dark gloss metallic gray.
Can-Car test pilot George Adye carried out its first test flight on 17 December 1938, from Can-Car's Bishopfield Airport. He noted the gull wing severely restricted downward and forward visibility. Another test pilot succinctly described it as being "blind as hell."[4] While enthusiastic over its maneuverability, the controls were overly sensitive and the flaps lowered too far. On a subsequent landing, the prototype was flipped on its back, although damage was minimal.
RCAF testers achieved a top speed of 261 mph (420 km/h) at 13,100 ft (4,000 m), with the same 700 hp (520 kW) Pratt & Whitney R-1535-72 engine used by the Grumman F3F-1 to attain 231 mph (372 km/h). However, this was without military equipment such as guns, ammunition or armour, and was much lower than Canadian Car and Foundry's claims.[5] Top speed was anticipated to reach 300 mph (480 km/h) with a 750 hp (560 kW) Pratt & Whitney R-1535-SB4-G, however installation of military equipment would have more than eliminated any gains. At the time of testing Gregor was redesigning it to accept the 1,200 hp (890 kW) Pratt & Whitney R-1830 Twin Wasp which he hoped would raise the top speed.
Designed, built and flown in under eight months, the FDB-1 Model 10 was sent to the Royal Canadian Air Force for testing. Severe canopy vibrations were experienced at speed or during aerobatics, and testing was restricted until this was remedied. Further tests showed that Gregor's claims were overly optimistic and the RCAF doubted further refinements would make any difference. As can be expected from a biplane without the weight of 8 machine guns, or armour to slow it down, the FDB-1 demonstrated amazing maneuverability and despite a speed advantage, the RCAF's Hawker Hurricane Mk.I monoplanes were unable to turn with it below 15,000 ft (4,600 m).
Contemporary "cigarette" card illustration of the Gregor FDB-1
DispositionEdit
Can-Car entered it in the January 1940 New York-to-Miami air race in a final effort to generate interest but shortly after takeoff oil pressure was lost, forced the FDB-1 to land, disqualifying it. During testing two months later its landing gear collapsed. Although Mexican authorities were interested and a registration was reserved, the Canadian government refused an export license and there were no other prospective customers.
Gregor claimed: "They'll start this war with monoplanes, but they'll finish it with biplanes." Neither his prediction nor his aircraft survived the war. After several years in storage, the FDB-1 was destroyed in a Cartierville Airport hangar fire.[6]
Burkowski, Gordon; Beauchamp, Gerry (June 1997). "Twin Wings and not even a Prayer". Wings. 27 (10).
Milberry, Larry (1979). Aviation in Canada. Toronto: McGraw-Hill Ryerson. ISBN0-07-082778-8.
Molson, Ken M.; Taylor, Harold A. (1982). Canadian Aircraft Since 1909. Stittsville, Ontario: Canada's Wings, Inc. ISBN0-92000211-0.
Robinson, Harry (February 1985). "Described No 262 - Gregor FDB-1". Aeromodeller.
Smith, Fred (May 1981). "One to Remember: Flying the Gregor FDB-1". Air Classics. 17 (5).
External linksEdit
Canadian military aircraft
best biplane fighter of the war
October 14, 2023
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The Gregor FDB 1 was a Canadian biplane fighter designed in 1938 by Michael Gregor and manufactured by Canadian Car and Foundry Despite having some advanced design features such as flush rivetted all metal construction and a retractable undercarriage the final generation of biplane fighters was being supplanted by monoplanes and the Gregor FDB 1 was obsolete before it flew Despite the Royal Canadian Air Force s desperation for modern fighters the sole example remained unsold and was eventually lost in a fire in 1945 The Gregor FDB 1 s model designation stood for Fighter Dive Bomber indicating its intended roles Gregor FDB 1L R Test Pilot George Ayde Can Car rep David Boyd and designer Michael GregorRole Fighter BomberManufacturer Canadian Car and FoundryDesigner Michael GregorFirst flight 17 December 1938Status AbandonedNumber built 1 Contents 1 Design 2 Development 3 Disposition 4 Specifications Gregor FDB 1 5 See also 6 References 6 1 Notes 6 2 Bibliography 7 External linksDesign EditIn 1938 Georgian expatriate designer Mikheil Grigorashvili anglicized as Michael Gregor joined with Canadian Car and Foundry which at that time was Canada s leading manufacturer of railroad rolling stock He was hired to design a fighter They wanted to enter the aircraft market but had no experience in that industry Instead of creating their own designs Can Car was producing aircraft under license that had been designed elsewhere In 1936 Grumman and Canadian Car amp Foundry or Can Car concluded an agreement for production of 50 Grumman SF 1 biplane carrier fighters known as GE 23s or Grumman Export 23s to be built in Canada There were still some who doubted the merits of the monoplane over the biplane in 1938 and Michael Gregor was one of them All the major powers still operated biplanes in front line fighter units however they were being replaced with monoplanes in every case The hydraulically operated landing gear retracted into wells on the sides of the fuselage ahead of the lower wing The fuselage of the Model 10 FDB I was a monocoque shell of circular cross section with a flush riveted aluminum stressed skin 95 US gallons 360 litres 79 imperial gallons of fuel was carried in a pair of semicircular tanks mounted side by side between the wheel wells The structure was stressed 60 percent above requirements A pair of fuselage mounted 50 cal machine guns synchronized to fire through the Hamilton Standard propeller s disk were part of the design but the armament was never installed Additionally two 116 lb 53 kg bombs could be carried one under each lower wing 1 The cockpit was enclosed with a rearward sliding canopy and the engine was faired in with a NACA cowling reminiscent of the Seversky monoplane fighters that Gregor had worked on Among the new devices incorporated in the FDB 1 was an anti spin parachute in the tailcone The pilot activated it from the cockpit with a switch that opened the cone deployed the chute and released the connecting cable 2 The metal wing structure was fabric covered behind the front spar as were the metal framed control surfaces The top wing featured full span slats plus all metal split flaps between the wing roots and ailerons The bottom wing also incorporated split flaps The center section of the top wing curved down to meet the fuselage in a gull wing configuration like earlier Polish and Soviet fighters such as the Polikarpov I 153 The wings were braced with V interplane struts Instead of flying and landing wires a single strut ran between the root of the top wing and the foot of the V strut on the lower wing on each side Torque tubes moved the control surfaces except for the rudder which was partially operated by cables nbsp Gregor FDB 1 being tested December 1938 Development EditA wood wind tunnel model was sent to Hawker Aircraft in England for testing early in 1938 and construction of the prototype began in Thunder Bay shortly thereafter with it completed in December 1938 amid an atmosphere of war jitters well salted with tales of German spies visiting the factory in disguise 3 When rolled out the FDB 1 c n 201 was registered CF BMB with the letters and ten horizontal rudder stripes in white over a dark gloss metallic gray Can Car test pilot George Adye carried out its first test flight on 17 December 1938 from Can Car s Bishopfield Airport He noted the gull wing severely restricted downward and forward visibility Another test pilot succinctly described it as being blind as hell 4 While enthusiastic over its maneuverability the controls were overly sensitive and the flaps lowered too far On a subsequent landing the prototype was flipped on its back although damage was minimal RCAF testers achieved a top speed of 261 mph 420 km h at 13 100 ft 4 000 m with the same 700 hp 520 kW Pratt amp Whitney R 1535 72 engine used by the Grumman F3F 1 to attain 231 mph 372 km h However this was without military equipment such as guns ammunition or armour and was much lower than Canadian Car and Foundry s claims 5 Top speed was anticipated to reach 300 mph 480 km h with a 750 hp 560 kW Pratt amp Whitney R 1535 SB4 G however installation of military equipment would have more than eliminated any gains At the time of testing Gregor was redesigning it to accept the 1 200 hp 890 kW Pratt amp Whitney R 1830 Twin Wasp which he hoped would raise the top speed Designed built and flown in under eight months the FDB 1 Model 10 was sent to the Royal Canadian Air Force for testing Severe canopy vibrations were experienced at speed or during aerobatics and testing was restricted until this was remedied Further tests showed that Gregor s claims were overly optimistic and the RCAF doubted further refinements would make any difference As can be expected from a biplane without the weight of 8 machine guns or armour to slow it down the FDB 1 demonstrated amazing maneuverability and despite a speed advantage the RCAF s Hawker Hurricane Mk I monoplanes were unable to turn with it below 15 000 ft 4 600 m nbsp Contemporary cigarette card illustration of the Gregor FDB 1Disposition EditCan Car entered it in the January 1940 New York to Miami air race in a final effort to generate interest but shortly after takeoff oil pressure was lost forced the FDB 1 to land disqualifying it During testing two months later its landing gear collapsed Although Mexican authorities were interested and a registration was reserved the Canadian government refused an export license and there were no other prospective customers Gregor claimed They ll start this war with monoplanes but they ll finish it with biplanes Neither his prediction nor his aircraft survived the war After several years in storage the FDB 1 was destroyed in a Cartierville Airport hangar fire 6 Specifications Gregor FDB 1 EditAviation in Canada 7 nbsp FDB 1 profile illustrationGeneral characteristics Crew One Length 21 ft 8 in 6 60 m Wingspan 28 ft 8 5 m 8 Height 9 ft 4 5 in 2 858 m Wing area 329 sq ft 30 6 m2 Empty weight 2 880 lb 1 306 kg Gross weight 4 100 lb 1 860 kg Powerplant 1 Pratt amp Whitney R 1535 72 9 cylinder air cooled radial engine 700 hp 520 kW Propellers 3 bladedPerformance Maximum speed 261 mph 420 km h 227 kn at 13 100 ft 4 000 m unarmed Cruise speed 205 mph 330 km h 178 kn Stall speed 72 mph 116 km h 63 kn clean and 58 mph 93 km h 50 kn with flaps and slats down Range 985 mi 1 585 km 856 nmi Service ceiling 27 700 ft 8 400 m RCAF figures 9 Rate of climb 2 800 ft min 14 m s at sea level unarmed RCAF figures 10 Armament Guns 2 0 50 in 13 mm machine guns Bombs 2 x 116 lb 53 kg bombs under wingsSee also EditAircraft of comparable role configuration and era Bleriot SPAD S 510 last French biplane fighter Fiat CR 42 Falco Last Italian biplane fighter Gloster Gladiator Last British biplane fighter Grumman F3F last American biplane fighter Heinkel He 51A Last German biplane fighter Kawasaki Ki 10 last Japanese biplane fighter Polikarpov I 153 Last Soviet biplane fighter References Edit nbsp Wikimedia Commons has media related to Gregor FDB 1 Notes Edit Milberry 1979 p 111 Burkowski and Beauchamp 1997 p 12 Burkowski and Beauchamp 1997 p 10 Smith 1981 p 49 Robinson 1985 Burkowski and Beauchamp 1997 p 14 Milberry 1979 pp 110 111 Aero digest Volume 34 1939 p 90 Robinson 1985 Robinson 1985 Bibliography Edit Burkowski Gordon Beauchamp Gerry June 1997 Twin Wings and not even a Prayer Wings 27 10 Milberry Larry 1979 Aviation in Canada Toronto McGraw Hill Ryerson ISBN 0 07 082778 8 Molson Ken M Taylor Harold A 1982 Canadian Aircraft Since 1909 Stittsville Ontario Canada s Wings Inc ISBN 0 92000211 0 Robinson Harry February 1985 Described No 262 Gregor FDB 1 Aeromodeller Smith Fred May 1981 One to Remember Flying the Gregor FDB 1 Air Classics 17 5 External links EditCanadian military aircraft best biplane fighter of the war Gregor s Geldings FDB 1 amp GR 1 Retrieved from https en wikipedia org w index php title Canadian Car and Foundry FDB 1 amp oldid 1101933092, wikipedia, wiki, book, books, library,
