Ketchup (oz9677)

About this Plan

Ketchup. Control line aerobatic model for 1 - 1.5cc power. Profile design.

Quote: "This is the 7th in a series of simple lightweight stunters designed around an AM 15 diesel powerplant. Though many early attempts were fairly manoeuvrable, they lacked strength. One version with 2 sq ft wing area and 7oz weight had an exceptional per-formance until a vertical landing splattered it over the local recreation ground. The latest development as planned here is really manoeuvrable yet easy to fly. Strong for its weight. (it is not intended as a trainer), it is also quite attractive. When complete, the original weighed just 7-1/2 oz which is a good figure to aim at.

Remember that wood selection is important. Ribs should be very light and that 1-1/4in thick sections take up a lot of sheet! The leading edge too should be fairly light, though do not choose brittle wood for this and the trailing edge which can be medium soft grade. Strength in the fuselage is important, so choose medium wood here and shape it down to reduce weight.

Construction is begun by cutting the leading edge, trailing edge and ribs from sheet. Cement ribs to bottom trailing edge, add leading edge top and bot-tom and plane and sand to fit front piece..."

Ketchup, Aeromodeller, July 1965.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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