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By comparison with the Siskin III, the Siskin IIIA introduced
a number of major design changes, including
a lengthened fuselage with raised aft decking, greater
gap and less upper wing dihedral, and redesigned vertical
tail surfaces lacking the ventral fin. Retaining the
twin 7.7mm Vickers gun armament, the Siskin
IIIA was powered by the 425hp Jaguar IV or super-
charged Jaguar IVS engine, and the slab-sided fuselage
gave place to a fuselage with rounded sides. The
Siskin IIIA, to Specification 19/23, first flew on 20
October 1925, and was ordered for the RAF in June
1926, 412 being built, including 47 dual-control trainers,
17 of the single-seaters being supplied to the RCAF. Of
the total production, the parent company built 159
(Blackburn building 42, Bristol 85, Gloster 74 and Vickers
52). At least one was completed as the experimental
Siskin IIIB with an uprated engine enclosed by a Townend
ring.
| MODEL | Siskin IIIA |
| ENGINE | 1 x Armstrong Siddeley Jaguar IV, 313/336kW |
| WEIGHTS |
| Take-off weight | 1366 kg | 3012 lb |
| Empty weight | 935 kg | 2061 lb |
| DIMENSIONS |
| Wingspan | 10.11 m | 33 ft 2 in |
| Length | 7.72 m | 25 ft 4 in |
| Height | 3.10 m | 10 ft 2 in |
| Wing area | 27.22 m2 | 292.99 sq ft |
| PERFORMANCE |
| Max. speed | 251 km/h | 156 mph |
| Ceiling | 8230 m | 27000 ft |
| ARMAMENT | 2 x 7.7mm machine-guns, 4 x 9kg bombs |
 | A three-view drawing (1657 x 1267) |
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