In its vivid red-and-white colour scheme, BA-4B SE-XCA became a regular sight at airshows around Sweden and is seen here performing a typically vigorous aerobatic routine with smoke.

BA-4B SE-XCC at the EAA Fly-in at Barkarby in June 1995;

Peter Philips in G-AWPZ (formerly SE-XBS) at a show in the UK in July 1970;

G-AYFV while being operated by Nick Houghton, seen here at the Popular Flying Association Rally at Cranfield in July 1986

The all-yellow G-BEBS in July 1988;

G-BIEX in August 1982 - it was written off in a landing accident when it hit trees at Snape Mires in April 1984;

Peter Philips undertakes a characteristically lively display in BA-4B G-AWPZ at an airshow in the 1970s. Now more than 50 years old, this historically significant and still-airworthy aircraft is based at Goodwood airfield in Sussex, from where it still flies regularly in essentially the same colour scheme it has worn throughout its life.

A dapper 27-year-old Bjorn Andreasson poses beside the BA-4 prototype in 1944.

The prototype BA-4B, SE-XBS, is prepared for a flight circa 1966-67. In contrast to the all-wood BA-4 prototype, the BA- 48 was of all-metal construction, although the design provided for alternative all-wooden wings too. The stagger was 20° with the upper wing set with dihedral of 2° and the lower wing of 4°. The prototype was fitted with a Continental O-200A engine, as seen here in its original cowling.

A rare photograph of BA-4Bs SE-XCA (c/n 2) and ’XCC (c/n 3) together, at Gavle in eastern central Sweden in September 1973. Note the improved engine cowlings providing the aircraft with much more attractive proportions. One example of a two-seat tandem version of the BA-4B, the BA-11, was built; it remains active.

A typically dramatic photograph by the late RICHARD T. RIDING of the BA-4B prototype SE-XBS being put through its paces during its demonstration visit to the UK in July 1967; former RAF pilot Peter Philips was so impressed he bought it.

The prototype BA-4 had the registration SE-ANS applied to its fuselage, but it was never officially taken up. Of mainly wooden construction, the extremely lightweight biplane was originally powered by an aero version of the 28 h.p. Scott Flying Squirrel air-cooled engine, built by the British company at its factory in Shipley, Yorkshire.