Blackburn 

T1 Swift

The Blackburn T1 Swift was a private venture torpedo bomber developed primarily for export sales (whilst having regard to the desire of the Air Ministry to replace the Sopwith Cuckoo). The prototype, designed by Major Frank Arnold Bumpus, was shown in near-complete form at the Olympia Aero Show in July 1920.

 

The Swift was a large conventional single seat two-bay tractor biplane with divided undercarriage legs to accommodate a torpedo. It was also provided with folding wings for stowage aboard ship. The longerons sloped down ahead of the pilot’s cockpit to improve the forward view for deck-landing, this becoming something of a Blackburn design trademark.

 

On a rather fraught first flight, the first prototype was found to be seriously tail-heavy and barely controllable. It was safely landed however after a wide, flat circuit at low level. The balance of the aircraft was quickly restored by applying a few degrees of sweep to the outboard wing panels.

 

The prototype was sent for trials at Martlesham Heath on 21st December 1920, carrying an RAF serial (N139). At Martlesham, it was tested with the Mk VIII and the Mk IX 15-inch torpedo and these trials resulted in the adoption of a revised rudder geometry. After further minor modifications it proceeded to conduct deck landing trials on HMS Argus in May 1921.

 

 

Blackburn sought export orders for the type, obtaining sales for two aircraft to the US Navy (A-6056 and A-6057) which were to be known the Swift F. A further two Swift II aircraft were purchased by the Imperial Japanese Navy as well as a further three (M-NTBA, M-NTBB and M-NTBC) sold the Spanish Navy. The export aircraft featured a sloping front radiator and a further revision to the tail surfaces.

 

Such was the promise of the design that it was adopted (following minor modifications such as a 35-inch reduction in wingspan) as the standard Fleet Air Arm torpedo aircraft and renamed the Blackburn T2 Dart which is described separately on this website.