- Preproduction B-24
Infobox Aircraft
name =XB-24 / LB-30
type =Bomber
manufacturer =Consolidated Aircraft Corporation
caption = Rare color photograph of an RAF LB-30
designer =Isaac M. Laddon
first flight =1939
introduced =1941
retired =1946,UK 1946,BOAC
number built =8
status =Retired
unit cost =$ 258,074.67
primary user =RAF
more user =USAAC
developed from =B-24 Liberator
variants with their own articles =The Consolidated Preproduction B-24 aircraft began in the fall of 1938 when the
US Army Air Corps (USAAC) approachedConsolidated Aircraft Corporation (CAC) with the intent of starting a secondBoeing B-17 Flying Fortress production line. The president of Consolidated Aircraft, Rueben H. Fleet, as well as the Chief Designer I.M. Laddon after reviewing the Seattle production lines felt that Consolidated Aircraft could build a better, more modern bomber then the B-17.Background
Using the highly advanced wing design created by David Davis as well as the
twin tail design from theConsolidated Model 31 flying boat , both were mated to new fuselage. This new fuselage was intentially designed around the twin bomb bays, each being the same size and capacity of the B-17.Based on several mock-ups, the USAAC issued Type Specification # C-212 on
1 February 1939 , which was specifically designed with the Consolidated Model 32 as the obvious winning design.History
On
30 March 1939 , the formal contract for the initial B-24 was signed.After initial testing, the XB-24 was found to be deficient in several areas. One major failure of the prototype was that it failed to meet the top speed requirements specified in the contract. As built, the XB-24 top speed was only 273 mph instead of the specified 311 mph. As a result, the mechanically supercharged
Pratt & Whitney R-1830 -33’s were replaced with the turbo-supercharged R-1830’s. Additionally, the tail span was widened by 2 feet and thepitot static tubes were relocated from the wings to thefuselage . The XB-24 was then redesigned XB-24B – these changes became standard on all B-24’s built starting with the B-24C model.The USAAC initially ordered 7 YB-24s under CAC contract # 12464 in April 1939, but like the prototype these aircraft were being built by hand and were not considered combat ready. Since both the
Royal Air Force and French were shopping for aircraft the first 6 YB-24 were released for direct purchase under CAC contract # F-677 on9 November 1940 . These aircraft were redesigned LB-30A. The seventh aircraft was used by Consolidated and the USAAC to testarmor installations as well as self-sealingfuel tanks . Initially, these aircraft were to be given USAAC serials 39-618 to 39-687 however, delays with the actual purchase the serials numbers were changed to 40-696 to 40-702. When the RAF purchased the first 6 YB-24 aircraft, the serial numbers were reassigned to a later block of B-24Ds.The RAF like the USAAC found the LB-30A unsuitable for combat and had them assigned to the transatlantic
Ferry Service betweenCanada andPrestwick ,Scotland . The aircraft were all modified inMontreal and included the removal of all armaments provision for passenger seating, revised cabinoxygen &heating system .The Aircraft
XB-24
*39-556
**29 October 1939 fuselage to wing mated.
** 29 December 1939 first flight (CAC Chief Pilot Bill Wheatley).
** 17 February 1940, first flown by USAAC (Major Umstead).
** 18 March 1940, first official USAAC flight.In the spring of 1940, the XB-24 was modified with
turbo-supercharged engines (P&W R-1830-41) wider horizontal tail plane, moved pitot static ports and redesigned XB-24B.XB-24B
*39-680
** 13 August 1940 accepted by the USAAC.
** 1944 Modified as Plush transport for CAC aircraft
** 20 June 1946, Scrapped atBrookley Field ,Alabama .YB-24 / Liberator LB-30A
* AM258 (ex 40-696) s/n 167. Delivered December 1940. Assigned as a transport with No.1425 Flight on the transatlantic ferry routes.
** 25 June 1946 ScrappedAlbuquerque, New Mexico .* AM259 (ex 40-697) s/n 168. Delivered December 1940. Assigned as a transport with
No.1425 Flight RAF on the transatlantic ferry routes.
** Assigned toBOAC with registration G-AGCD.
** 5 January 1943 midair collision withUSSR A-20 .* AM260 (ex 40-698) s/n 169. Delivered December 1940. Assigned as a transport with No.1425 Flight on the transatlantic ferry routes.
** June 1941 Ferry Flight (Pilot F/L Spencer Leonard Ring).
**14 August 1941 Crashed and burned on takeoff atHeathfield Airfield ,Ayr ,Scotland , after veered off the runway and striking a small building and then an embankment. (22 Killed)) [ [http://planecrashinfo.com/1941/1941-13.htm Plane Crash Info 1941] ] (Pilot was Captain Stafford) Arthur Blaikie Purvis Head of theBritish Purchasing Commission was one of those killed as a passenger on transit to Canada.* AM261 (ex 40-699) s/n 170. Delivered December 1940. Assigned as a transport with No.1425 Flight on the transatlantic ferry routes.
** 02 August 1941 flew theDuke of Kent across the Atlantic.
** 10 August 1941 Crashed onGoat Fell ,Isle of Arran , Scotland (BOAC Pilot Ernest Robert White [ [http://www.peakdistrictaircrashes.co.uk/awayam261.htm Peak District Air Crashes of the UK] ]* AM262 (ex 40-700) s/n 171. Delivered December 1940. Assigned as a transport with No.1425 Flight on the transatlantic ferry routes.
** June 1941 Ferry Flight (Pilot F/L Spencer Leonard Ring).
** Assigned to BOAC with registration G-AGHG.
** 30 May 1946 SOC* AM263 (ex 40-701) s/n 172. Delivered December 1940. Assigned as a transport with No.1425 Flight on the transatlantic ferry routes.
** Assigned to BOAC with registration G-AGDS.
** 15 February 1942, crashedEddystone * YB-24 40-702 s/n 173. Delivered December 1940
** Assigned toWright Field Codes MD 120
** 28 March 1944 surveyed and scrappedMacDill Field ,Florida Notes
References
* Birdsall, Steve. "B-24 Liberator In Action". Carrollton, Texas: Squadron/Signal Publications, 1975. ISBN 0-89747-020-6.
* Blue, Al. "Pictorial History of the B24 Liberator Bomber". New York: Simon & Schuster, 1985. ISBN 0-68414-508-1.
* O'Leary, Michael. "Consolidated B-24 Liberator: Production Line to Front Line". Botley, UK: Osprey Publishing, 2002. ISBN 1-84176-023-4.
* Pearcy, Arthur. "Lend-Lease Aircraft in World War II: An Operational History". St. Paul, Minnesota: MBI Publishing Company LLC, 1996. ISBN 0-76030-259-6.ee also
*
Consolidated Liberator I
*XB-41 Liberator
*C-87 Liberator Express
*Consolidated PB4Y-2
*Consolidated B-24 Survivors
*List of B-24 Liberator operators
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