Keystone B-5

Infobox Aircraft
name=B-5


caption=Keystone B-5A
type=Light bomber
manufacturer=Keystone
designer=
first flight=
introduced=
retired=
status=
primary user=United States Army Air Corps
more users=
produced=
number built= 3 Y1B-5
27 B-5A
unit cost=
developed from=Keystone B-3
variants with their own articles=

The Keystone B-5 was a light bomber made for the United States Army Air Corps in the early 1930s. The B-5A was a Keystone B-3A with Wright Cyclone rather than Pratt & Whitney engines.

Design and development

Three B-3A (LB-10A) were reengined with Wright R-1750-3 radial engines and were redesignated Y1B-5. The U.S. Army Air Corps changed the design of the last 27 LB-10As on order, replacing the Pratt & Whitney R-1690 radial engines with the Wright R-1750-3. The Pratt & Whitney-powered aircraft were designated B-3A, and the Wright-powered aircraft became B-5A. They provided the backbone of the U.S. bomber force from then to 1934.

Operational history

B-5A were first line bombers of the United States for the period between 1930 and 1934. Later remained in service until the early 1940s serving primarily as observation aircraft.

Variants

;LB-14:As LB-10 with 575hp (429kW) GR-1860 engines but delivered as the Y1B-5.;Y1B-5:Three pre-production aircraft redesignated from LB-14 before delivery.;B-5A:Wright R-1750-3 version of B-3A, 27 built

Operators

;flag|United States|1912
*United States Army Air Corps

pecifications (B-5A)

aircraft specifications
plane or copter?=plane
jet or prop?=prop
crew=5
length main=48 ft 10 in
length alt=14.9 m
span main=74 ft 8 in
span alt=22.8 m
height main=15 ft 9 in
height alt=4.8 m
area main=1,145 ft²
area alt=106.4 m²
empty weight main=7,705 lb
empty weight alt=3,945 kg
loaded weight main=12,952 lb
loaded weight alt=5,875 kg
max takeoff weight main= lb
max takeoff weight alt= kg
number of props=2
engine (prop)=Wright R-1750-3
type of prop=radial engines
power main=525 hp
power alt=392 kW
max speed main=111 mph
max speed alt=97 kt, 179 km/h
cruise speed main=98 mph
cruise speed alt=86 kt, 160 km/h
range main=815 mi
range alt=707 nm, 1,310 km
ceiling main=14,000 ft
ceiling alt=4,270 m
loading main=273.3 lb/f²
loading alt=52.22 kg/m²
power/mass main=0.0810 hp/lb
power/mass alt=133 W/kg
guns=3× .30-calibre (7.62 mm) Browning machine guns
bombs=2,500 lb (1,100 kg); 4,000 lb (1,800 kg) on short runs

External links

* [http://www.wpafb.af.mil/museum/research/bombers/b1-47.htm USAF Museum article on B-5]
* [http://www.wpafb.af.mil/museum/research/bombers/b1-34.htm USAF Museum article on LB-14]

ee also

aircontent
related=
* Keystone B-3
* Keystone B-4
* Keystone B-6
similar aircraft=
sequence=
lists=
* List of bomber aircraft
* List of military aircraft of the United States