United States (1927)
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The Keystone XLB-3 was a twin-engine prototype form of the earlier Huff-Daland LB-1 model of 1923.
Detailing the development and operational history of the Keystone XLB-3 Prototype Light Bomber Biplane. Entry last updated on 5/26/2016. Authored by Staff Writer. Content ©www.MilitaryFactory.com
The original XLB-3 was outfitted with 2 x Allison VG-1410 (a variant of the "Liberty 12") air-cooled inverted V12 engines of 400 horsepower (each) and it was this prototype form that was handed to the United States Army Air Corps for formal testing in 1927. The crew included two pilots, a bombardier, and two dedicated machine gunners. The defensive gun network included five trainable .303 Lewis machine guns while the offensive bombload carried reached 2,205 lb.
However, performance of the original prototype was less than that of the preceding single-engine LB-1 design which forced a revision of the XLB-3 to become the XLB-3A. This mark was modified through the installation of a pair of Pratt & Whitney R-1340 radial piston engines of 410 horsepower. Beyond that, the design stayed largely faithful to the original offering.
Despite the engine change, the required performance was still lacking and USAAC interest waned as it moved on the related LB-5 instead. The LB-5 found a bit more success in that it was procured in 36 examples from Keystone. Keystone Aircraft Corporation was formed from the purchase of Huff-Daland by Hayden, Stone & Company. Keystone then fell under the Curtiss-Wright brand label from 1929 onwards until its services were terminated in 1932.
Only a single XLB-3 aircraft was ever completed.
Any available statistics for the Keystone XLB-3 Prototype Light Bomber Biplane are showcased in the areas immediately below. Categories include basic specifications covering country-of-origin, operational status, manufacture(s) and total quantitative production. Other qualities showcased are related to structural values (namely dimensions), installed power and standard day performance figures, installed or proposed armament and mission equipment (if any), global users (from A-to-Z) and series model variants (if any).
Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.
Relative Maximum Speed Rating
This entry's maximum listed speed (116mph).
Graph average of 90 miles-per-hour.
Graph showcases the Keystone XLB-3's operational range (on internal fuel) when compared to distances between major cities.