BA Swallow (oz1591)
About this Plan
BA Swallow. Scale rubber free flight model of the 1930s two-seater low wing sports trainer.
From March 1943 Aeromodeller. The subject BA Swallow was a license-built version of the German Klemm L.25.
Quote: "General: This machine was in use extensively before the outbreak of war by flying clubs and private owners. It is a light plane of spruce and ply construction, ply covered, with a 90 hp Cirrus engine. The large area of the main planes, and their disposition, and the ample tail surfaces all make for a successful flying scale model of the machine.
Power: Two motors, each 4 strands 1/4 in by 1/30 in rubber.
Gearbox: Two gears 1/2 in diameter meshing, driving 1-3/8 in gear on prop shaft. Mounted on brass plates, front and rear, ballthrust races. Ratio of step-up = 17-17-13 =1.31-1 on prop.
Fuselage: First build two flat sides right on top of the plan, identical to each other, by laying down the longerons and the wing base former and, starting at the nose cutting and cementing in the diagonal bracing pieces Do not fit the patch plates around the wing base formers, or the rear motor anchorage plates, yet.
Erect the fuselage by assembling the two sides with the straight across crossmembers, and CBB1, CBR2 and CBB3 at the bottom, and frames 5, 6, 7, 8, 9, 10 at the top. True up and cement firmly. Next draw the tail-ends together and cement to the sternpost, holding with pins whilst the cement dries hard. Cut and insert all the diagonal cross-bracings from the rear cockpit to the sternpost, true up, and cement firmly. Cut the cross pieces for the nose, cement, and hold in by rubber bands until dry. Now cut and insert all the remaining diagonal braces, true up the whole fuselage finally, and put aside to set.
Now fit remaining decking frames, all stringers, patch plates inside fuselage at wing base formers, rear motor anchorages, tail skid, dowel tube for the tail unit, dashboards ; sheet in the nose with 1/16 sheet up to frame 4, and add the cowling formers, finally cementing on top and side cowlings of 1/64 in sheet.
Centre-section. Block up the fuselage with the top longerons level fore and aft and across. Slide in the twin spars through the holes in the WBF, packing them apart 1/8 in and 1/16 in respectively. Check for alignment and cross level, and before cementing firmly in place finally. cement on spar stiffeners; then cement spars to WBF. Now slot on the centre-section ribs on each side, check for 3 degree incidence and cement in place. Adding the LE, TE, undercarriage supports and plywood facing ribs completes the assembly. Cover centre-section in 1/64 in sheet..."
Supplementary file notes
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by JL Roberts
Scale Rubber F/F LowWing Trainer Civil
all formers complete :)
got article :)
Found online 09/09/2011 at:
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