Boeing XF4B-1

     
Název:
Name:
Boeing XF4B-1 Boeing XF4B-1
Originální název:
Original Name:
Boeing XF4B-1
Kategorie:
Category:
stíhací letoun fighter aeroplane
Výrobce:
Producer:
DD.MM.1928-DD.MM.1928 Boeing Airplane Co., Seattle, Washington
Období výroby:
Production Period:
DD.MM.1928-DD.MM.1928
Vyrobeno kusů:
Number of Produced:
2:
Model 83 (NX7133)
Model 89 (NX7134)
První vzlet:
Maiden Flight:
25.06.1928
Osádka:
Crew:
1
Základní charakteristika:
Basic Characteristics:
 
Vzlet a přistání:
Take-off and Landing:
CTOL - konvenční vzlet a přistání CTOL - conventional take-off and landing
Uspořádání křídla:
Arrangement of Wing:
dvouplošník biplane
Uspořádání letounu:
Aircraft Concept:
klasické conventional
Podvozek:
Undercarriage:
pevný fixed
Přistávací zařízení:
Landing Gear:
kola wheels
Technické údaje:
Technical Data:
 
Hmotnost prázdného letounu:
Empty Weight:
755 kg 1665 lb
Vzletová hmotnost:
Take-off Weight:
1160 kg 2557 lb
Maximální vzletová hmotnost:
Maximum Take-off Weight:
? kg ? lb
Rozpětí:
Wingspan:
9.14 m 30ft
Délka:
Length:
6.28 m 20ft 7,38in
Výška:
Height:
2.93 m 9ft 7,25in
Plocha křídla:
Wing Area:
21.14 m2 227,5 ft2
Plošné zatížení:
Wing Loading:
? kg/m2 ? lb/ft2
Pohon:
Propulsion:
 
Kategorie:
Category:
pístový piston
Počet motorů:
Number of Engines:
1
Typ:
Type:
Pratt & Whitney R-1340B Wasp o výkonu 336 kW
dvoulistá kovová vrtule
Pratt & Whitney R-1340B Wasp, power 450 hp
two-blade metal propeller
Objem palivových nádrží:
Fuel Tank Capacity:
? ?
Výkony:
Performance:
 
Maximální rychlost:
Maximum Speed:
271.7 km/h v ? m 168.8 mph in ? ft
Cestovní rychlost:
Cruise Speed:
228.5 km/h v ? m 142 mph in ? ft
Rychlost stoupání:
Climb Rate:
14.8 m/s 2920 ft/min
Čas výstupu na výšku:
Time to Climb to:
? min do ? m ? min to ? ft
Operační dostup:
Service Ceiling:
8199 m 26900 ft
Dolet:
Range:
836.9 km 520 mi
Maximální dolet:
Maximum Range:
? km ? mi
Výzbroj:
Armament:
1x 7,62mm kulomet Browning
1x 12,7mm kulomet Browning

1x 227kg bomba (Model 89)
1x .30 Browning machine gun
1x .50 Browning machine gun

1x 500 lb bomb (Model 89)
Uživatelské státy:
User States:
Poznámka:
Note:
- -
Zdroje:
Sources:
Davis, Larry. P-12/F4B in Action, In Action No.141. Squadron/Signal Publications, Carrollton 1994. ISBN 0-89747-309-4.
Bowers, Peter M. The Boeing F4B-4, Profile No.27, Profile Publications, Leatherhead.
Bowers, Peter M. The Boeing P-12E, Profile No.2. Profile Publications, Leatherhead.
Bowers, Peter M. Boeing Aircraft since 1916. Putnam Aeronautical Books, London 1989. ISBN 0-85177-804-6.
Swanborough, F. G., Bowers, P. M. US Navy Aircraft Since 1911, Putnam Aeronautical Books, London 1990. ISBN 0-85177-838-0.
Pelletier, Alain. Boeing - The Complete Story. Haynes Publishing, Yeovil 2010. ISBN 978-1-84425-703-4.
Jones, LLoyd S. U.S. Fighters. Aero Publishers, Inc. Fallbrook 1975.
United States Army and Air Force Fighters 1916-1961, Harleyford Publications, Letchworth 1961.
http://www.aerofiles.com/_boe2.html
http://www.airminded.net/F4b/BoeF4b.html

Boeing XF4B-1 - Model 89 již po úpravě na standardní F4B-1

Model 89 již po úpravě na standardní F4B-1
URL : https://www.valka.cz/Boeing-XF4B-1-t121565#416124 Version : 0
Already during the testing of the XF3B-1 airborne fighter, the Boeing factory saw the possibility of further developing the design into a machine that could replace both the Navy's F2B and F3B and the Army's PW-9, and soon began the self-financed construction of two prototypes. These differed in some elements and were therefore given different designations. The Model 83 had a chassis with wheels on a common axle, and was given a grappling hook; the Model 89 had separate undercarriage legs, and lacked the hook. However, the freer space between the undercarriage legs made it possible to hang a five-pound bomb there.


There was no radical step in the design, everything was just the result of further development of already proven elements. The only major difference from previous Boeing fighters was the use of a riveted aluminium airframe instead of welded steel. For the Model 83 (and the first of the following production machines), however, the engine bed and nose were still steel. The wings, on the earlier machines with a slight sweep, were now straight but still wooden, with the new Boeing 106 profile. The tail surfaces were made as a semi-shell using aluminum corrugated sheet, as on the F3B-1. The armament also remained the same, of course - as was common practice, all F4B/P-12 series machines could carry either two 7.62mm Browning machine guns, each with 600 rounds, or replace one of the machine guns with a 12.7mm Browning machine gun with 200 rounds. In addition to the aforementioned 227kg bombs under the Model 89's fuselage, it was also possible to fit slings under the wings - but future Army machines usually carried only practice twenty-five-pound bombs. Both prototypes received the Pratt & Whitney R-1340B engine, rated at 336 kW at an altitude of 1,500 m, and the propeller was adjustable on the ground. They could also carry a 55-gallon jettisonable auxiliary tank under the fuselage.


The Model 83 first flew in Seattle on June 25, 1928, and was delivered to San Diego three days later for initial testing. The Model 89 was completed a month later and transported by rail to the Naval Test Center in Anacostia, where it also made its first takeoff on August 7. With essentially the same engine as the F3B-1, the new machines achieved 35 km/h (35 mph) more speed, over 2,200 m (1,000 ft) more range, and incomparably better climb performance. Both machines were still officially civilian, wearing a coat of grey paint with green trim, and not only did they carry no military markings, but not even their civilian registrations. The Navy, however, kept both machines on record as XF4B-1, and the former later received U.S. Navy lettering on its stern in San Diego. The Model 83 was even publicly unveiled at the National Air Races in Los Angeles, where it immediately set a new record for climb rate. The second machine, after testing in Anacostia, was also loaned to the Army Air Force, which operated it on a test basis at its Bolling Field base, which was actually just on the other side of the runway.


The tests resulted in an order for 27 production machines, with factory designation Model 99 and naval F4B-1, and both prototypes returned to the parent factory where they were modified to that standard. The production machines, for example, had the R-1340C, or according to the new markings, the R-1340-7 engine, which had a flatter front cowling, but the one-mile drop in speed caused by the higher drag was not serious compared to the cost of starting mass production of the "B". The chassis was also modified on the Model 83, as the series received a chassis based on the other machine. On 7 November 1928, a variant for the Army Air Corps was also ordered, which was designatedP-12 and, apart from the lack of naval equipment, did not differ much from the F4B-1.


These orders were still modest, essentially just machines for operational testing, but they became the first of a total of 586 machines built as F4B, P-12 or one of the civilian or export versions, were the last fighter biplanes in U.S. Army service, and were still in use in auxiliary roles in 1941.
Boeing XF4B-1 - Model 89 v původní podobě

Model 89 v původní podobě
URL : https://www.valka.cz/Boeing-XF4B-1-t121565#416266 Version : 0
Photos of the demonstrator
Boeing XF4B-1 -


URL : https://www.valka.cz/Boeing-XF4B-1-t121565#203604 Version : 0
Discussion post Fact post
Attachments


Join us

We believe that there are people with different interests and experiences who could contribute their knowledge and ideas. If you love military history and have experience in historical research, writing articles, editing text, moderating, creating images, graphics or videos, or simply have a desire to contribute to our unique system, you can join us and help us create content that will be interesting and beneficial to other readers.

Find out more