The Dart T.2 held a crew of one and an overall length of 35.4 feet, a wingspan of 45.5 feet, and a height of 12.10 feet. Empty weight reached 4,000lb against an MTOW of 6,400lb. The Napier powerplant, coupled to the biplane airframe, reached a maximum speed of 107 miles-per-hour with a range out to 355 nautical miles, and a maximum altitude of 12,700 feet. Rate-of-climb was 600 feet-per-minute.
Armament included a 0.303 Vickers Machine Gun in a fixed, forward-firing mounting over the nose and synchronized to fire through the spinning propeller blades. For those versions incorporating a rear observers/gunner's cockpit, there was a 0.303 Lewis Machine Gun atop a trainable mounting. The standard war load was a single 18" (457mm) aerial torpedo or 2 x 520lb drop bombs in its place.
There existed an export form, retaining the "Swift" name, and eight were built to various standards. The Swift Mk.II were seven export forms built and the United States Navy (USN) trialed the "Swift F" model under the "BST-1" name. Both the Japanese and Spanish navy services also looked into the Swift Mk II version.
Other Dart operators were the Greek Navy who took a stock of sixteen (under the designation of "Velos T.3") in 1925 of which twelve were built locally under license. These differed mainly in their twin-seat arrangement to reduce pilot workloads. The Velos T.3A were six biplanes built to a trials-and-demonstration standard by Blackburn.
In British service, Darts were eventually succeeded by the Blackburn Rippon and Blackburn Baffin aircraft of the early-1930s - both detailed elsewhere on this site.
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