Broadside (oz13446)

About this Plan

Broadside. Team racer for 1/2A engine.

Quote: "Broadside 1/2A Team Racer, by Jim Woodside.

1/2A Team Racing is an attractive event, quite as exciting as FAI but much less demanding on the pocket. One of the best available engines, the Oliver 'Cub', is Brit-ish, and still costs only about £20. How-ever, the event has been in the doldrums in recent years. The time seems right to ginger up interest in 1.5 cc racing espe-cially in these noise sensitive days. So come on beginners (and experts with ancient models). Could I also ask organis-ers to include more of these events in future planning?

Broadside was built by Peter Suther-land and myself during the winter of 1975/76 and it has proved a competitive design, being powered by Don Howarth and George Copeman modified Cubs. My thanks to Mike Broadbent for the drawing - hence the composite name.

Construction: Begin with the engine pan, either from a casting or aluminium plate about 6mm thick. In either case, make sure that the engine face is flat by using a glass plate onto which 'wet and dry' paper is taped. Start with 120 grade, finish with 320. Lighten carefully. Tap 6BA for engine and 8BA for hold down to model.

Make up the tank as shown. I have always found the Turtle tank to give excel-lent engine runs without being sensitive to position. If you have the equipment, make up a fuel stop as drawn and solder to tank base. This Malcolm Ross design is reli-able, light and compact. You could use a tube crusher on the style of Sweeter FAI model (Aeromodeller June 1976).

Construct the under carriage box and leg. The amount of swing gives bounce-free fast landings. Further details can be found p.586 October 76 Aeromodeller.

Finally, make the circular bellcrank and the elevator horn. Use silver solder wherever possible and certainly on the elevator. The use of hard solder and brass seems the permanent answer to tank leaks and general failures. You now have a kit of hardware bits. Do not be afraid to change any of the parts to suit your own prefer-ences and experience.

Wing: Choose a medium to light straight grained 6 x 100mm sheet of balsa and cut out the basic outline. Note this is 12mm less than the full span. Cut the hardwood leading edge to full span. Try to find a piece with even and horizontal grain. Take three lengths of 3 x 6mm hard balsa, cut to length for trailing edge.

Now, using PVA glue, start to glue up the wing blank. Put a film of glue on leading edge with grain horizontal, and a film of glue on front edge of balsa blank, then bring both together remembering that hardwood leading edge overhangs by 6mm each tip, work-ing quickly make a sandwich of the three 3 x 6mm trailing edges. Curve them around the edge of the wing blank and tape the whole thing with sellotape. Leave to dry.

Cut out hole for bellcrank and then a wedge in the inboard wing for the lead-outs - see 'Classic Clarkson Quickies' in the Control Line Aeromodeller Special. Fit the lead out tubes and glue this back in place, leaving the centre section square, carve and sand wing to a symmetrical sec-tion. Add wing tips. Cut through channels near wing tip for line connectors..."

Broadside, Aeromodeller, April 1979.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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