Keystone XLB-3: Difference between revisions
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Importing Wikidata short description: "Prototype Biplane Bomber" (Shortdesc helper) |
Trialpears (talk | contribs) m Convert Template:Aerospecs to Template:Aircraft specs per Wikipedia:Templates for discussion/Log/2019 March 20#Template:Aerospecs (via WP:JWB) |
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|name= XLB-3 |
|name= XLB-3 |
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|image= File:Keystone XLB-3A.jpg |
|image= File:Keystone XLB-3A.jpg |
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|image_border= yes |
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|caption= XLB-3A |
|caption= XLB-3A |
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}}{{Infobox aircraft type |
}}{{Infobox aircraft type |
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|manufacturer= [[Keystone Aircraft]] |
|manufacturer= [[Keystone Aircraft]] |
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|designer= |
|designer= |
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|first flight= ca. December |
|first flight= ca. December 1927 |
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|introduced= |
|introduced= |
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|retired= |
|retired= |
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<!-- ==Operators (choose)== --> |
<!-- ==Operators (choose)== --> |
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==Specifications (XLB-3A)== |
==Specifications (XLB-3A)== |
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{{Aircraft specs |
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{{aerospecs |
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|ref=''Jane's Encyclopedia of Aviation''<ref>Taylor 1989, p. 559.</ref> |
|ref=''Jane's Encyclopedia of Aviation''<ref>Taylor 1989, p. 559.</ref> |
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|prime units? = imp |
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|met or eng?=<!-- eng for US/UK aircraft, met for all others. You MUST include one or the other here, or no specifications will show -->eng |
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|crew=Five – pilot, copilot, bombardier, two gunners |
|crew=Five – pilot, copilot, bombardier, two gunners |
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|capacity= |
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|length m=13.72 |
|length m=13.72 |
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|length ft=45 |
|length ft=45 |
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|span ft=67 |
|span ft=67 |
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|span in=0 |
|span in=0 |
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|swept m=<!-- swing-wings --> |
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|swept ft=<!-- swing-wings --> |
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|swept in=<!-- swing-wings --> |
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|rot number=<!-- helicopters --> |
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|rot dia m=<!-- helicopters --> |
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|rot dia ft=<!-- helicopters --> |
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|rot dia in=<!-- helicopters --> |
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|dia m=<!-- airships etc --> |
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|dia ft=<!-- airships etc --> |
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|dia in=<!-- airships etc --> |
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|width m=<!-- if applicable --> |
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|width ft=<!-- if applicable --> |
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|width in=<!-- if applicable --> |
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|height m=5.13 |
|height m=5.13 |
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|height ft=16 |
|height ft=16 |
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|wing area sqm=1,038 |
|wing area sqm=1,038 |
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|wing area sqft=105.8 |
|wing area sqft=105.8 |
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|swept area sqm=<!-- swing-wings --> |
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|swept area sqft=<!-- swing-wings --> |
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|rot area sqm=<!-- helicopters --> |
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|rot area sqft=<!-- helicopters --> |
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|volume m3=<!-- lighter-than-air --> |
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|volume ft3=<!-- lighter-than-air --> |
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|aspect ratio=<!-- sailplanes --> |
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|wing profile=<!-- sailplanes --> |
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|empty weight kg=2,756 |
|empty weight kg=2,756 |
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|empty weight lb=6,065 |
|empty weight lb=6,065 |
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|gross weight kg=5,310 |
|gross weight kg=5,310 |
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|gross weight lb=11,682 |
|gross weight lb=11,682 |
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|lift kg=<!-- lighter-than-air --> |
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|lift lb=<!-- lighter-than-air --> |
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|eng1 number=2 |
|eng1 number=2 |
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|eng1 |
|eng1 name=[[Pratt & Whitney R-1340]] |
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|eng1 kw=<!-- prop engines -->305 |
|eng1 kw=<!-- prop engines -->305 |
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|eng1 hp=<!-- prop engines -->410 |
|eng1 hp=<!-- prop engines -->410 |
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|eng1 kn=<!-- jet/rocket engines --> |
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|eng1 lbf=<!-- jet/rocket engines --> |
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|eng1 kn-ab=<!-- afterburners --> |
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|eng1 lbf-ab=<!-- afterburners --> |
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|eng2 number= |
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|eng2 type= |
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|eng2 kw=<!-- prop engines --> |
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|eng2 hp=<!-- prop engines --> |
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|eng2 kn=<!-- jet/rocket engines --> |
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|eng2 lbf=<!-- jet/rocket engines --> |
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|eng2 kn-ab=<!-- afterburners --> |
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|eng2 lbf-ab=<!-- afterburners --> |
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|max speed kmh=186 |
|max speed kmh=186 |
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|max speed mph=116 |
|max speed mph=116 |
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|max speed mach=<!-- supersonic aircraft --> |
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|cruise speed kmh=<!-- if max speed unknown --> |
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|cruise speed mph=<!-- if max speed unknown --> |
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|stall speed kmh=<!-- aerobatic and STOL aircraft --> |
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|stall speed mph=<!-- aerobatic and STOL aircraft --> |
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|range km=870 |
|range km=870 |
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|range miles=544 |
|range miles=544 |
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|endurance h=<!-- if range unknown --> |
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|endurance min=<!-- if range unknown --> |
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|ceiling m=3,400 |
|ceiling m=3,400 |
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|ceiling ft=11,210 |
|ceiling ft=11,210 |
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|g limits=<!-- aerobatic aircraft --> |
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|roll rate=<!-- aerobatic aircraft --> |
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|glide ratio=<!-- sailplanes --> |
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|climb rate ms=2.8 |
|climb rate ms=2.8 |
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|climb rate ftmin=550 |
|climb rate ftmin=550 |
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|sink rate ms=<!-- sailplanes --> |
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|sink rate ftmin=<!-- sailplanes --> |
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|armament5= |
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|armament6= |
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}} |
}} |
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Latest revision as of 19:56, 26 July 2020
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (April 2017) |
| XLB-3 | |
|---|---|
| |
| XLB-3A | |
| Role | Light bomber |
| National origin | United States |
| Manufacturer | Keystone Aircraft |
| First flight | ca. December 1927 |
| Primary user | United States Army Air Corps |
| Number built | 1 |
The Keystone XLB-3 (originally built under the Huff-Daland name) was a prototype bomber biplane developed in the United States in the late 1920s. It was a twin-engine development of the single-engine LB-1, brought about by a change in policy by the United States Army Air Corps (USAAC).
Design and development
[edit]The shift from a nose-mounted engine to engines mounted in nacelles on the lower wing created an opportunity to provide stations for two extra crewmembers: a bombardier and a nose-gunner, bringing the total to five. The LB-1's single tailfin and rudder was augmented by an extra rudder either side of it.
Operational history
[edit]A single prototype was constructed, and delivered to the USAAC for evaluation at the end of 1927. Evaluation, however, showed that performance was actually inferior to that of the single-engine LB-1. The decision was taken to change the XLB-3's air-cooled inverted Liberty engines for air-cooled radials, at which point it was redesignated XLB-3A. With performance still unsatisfactory, development was abandoned in favor of a parallel design, the LB-5.
Variants
[edit]- XLB-3 – original version with Allison VG-1410 air-cooled inverted V-12 engines (1 built)
- XLB-3A – version with Pratt & Whitney R-1340 radial engines (1 converted from XLB-3)
Specifications (XLB-3A)
[edit]Data from Jane's Encyclopedia of Aviation[1]
General characteristics
- Crew: Five – pilot, copilot, bombardier, two gunners
- Length: 45 ft 0 in (13.72 m)
- Wingspan: 67 ft 0 in (20.42 m)
- Height: 16 ft 10 in (5.13 m)
- Wing area: 105.8 sq ft (1,038 m2)
- Empty weight: 6,065 lb (2,756 kg)
- Gross weight: 11,682 lb (5,310 kg)
- Powerplant: 2 × Pratt & Whitney R-1340 , 410 hp (305 kW) each
Performance
- Maximum speed: 116 mph (186 km/h, 101 kn)
- Range: 544 mi (870 km, 473 nmi)
- Service ceiling: 11,210 ft (3,400 m)
- Rate of climb: 550 ft/min (2.8 m/s)
Armament
- 2 × trainable .303 in (7.7 mm) Lewis guns in open position in nose
- 2 × trainable .303 in (7.7 mm) Lewis guns in open dorsal position
- 1 × trainable .303 in (7.7 mm) Lewis gun in ventral hatch
- 2,205 lb (1,000 kg) of bombs
References
[edit]Notes
[edit]- ^ Taylor 1989, p. 559.
Bibliography
[edit]- Taylor, Michael J. H. Jane's Encyclopedia of Aviation. London: Studio Editions, 1989.
- World Aircraft Information Files. London: Bright Star Publishing, File 899, Sheet 09.
External links
[edit]
Wikimedia Commons has media related to Keystone XLB-3.