Coccinelle. Free flight twin sport model. Semi-scale 'jet' airliner.
Quote: "Who said it was impossible? This remarkable semi-scale Jet Airliner flies like a dream, even on unmatched power units. Coccinelle by HE Males.
WHEN THE remarkable attributes of tail-mounted twin engined models were first observed in thought provoking test flights at RAF Henlow last year, we began to appreciate the possibilities of such a layout.
In their feature on tail twins (November 1959 issue) HE Males and R Deveraux listed the experiments and described prototypes that had performed well under free flight and radio control, regardless of engine syn-chronisation. An obvious further development was something on the lines of the French Caravelle jet airliner and in Coccinelle, HE Males has produced a docile twin which is an assured crowd stopper. With protected props, and the great virtue of being able to perform well on one engine, Coccinelle also employs a simple construction system to enable quick building of the airframe.
Make up the fuselage box and fit back of weight compartment. Mark around the box at 3 in intervals to give location of formers. Fit formers 1 to 12 then make the undercarriage assemblies and fix to box. (Nose wheel and washers must be fitted before bending the wire). Assemble box for wing tongue, bind lightly with thread, coated with cement before fixing with incidence packing to fuselage box. Check engines and props to be used against drawings for clearance. Make up the engine bearer and cement in place, also the piece of 1/8 in sheet forward. Fit parts of former 13 and aft vertical keel which keys the tail incidence, then add F14 halves. Fix top and bottom central stringers.
Fit the two central side stringers ensuring that rear point is central in plan view, then all other stringers. Plank between stringers adjacent to wing box, also above and below engine bearers and round undercarriage legs. Fit root ribs over ends of wing box and fair into fuselage with 1/16 in sheet. Add fin to the fuselage, also tailplane platform.
Make tailplane using soft sheet for leading edge covering. Steam sheet LE covering for the wing to curvature before fixing. Rib 1 must be bevelled as shown in section.
Dummy jets are made by rolling and steaming very soft sheet round 1 in. diameter rod and fitting formers. Assemble the uncovered model, rest engines and propellers on bearers and add lead to the weight box to bring balance point to a position 1/4 in behind CG shown on plan. Fit noseblock, cover tailplane with lightweight tissue, remainder with heavy grade. Give two coats of clear dope. Fit dummy jets to the bearers and rudder to the fin. Colour dope as desired, preferably to resemble an airliner, fuel proof the engine bearers and dummy jets only. Cut ears off small graduated tanks and fit with a cement fillet around their tops. Bolt engines on upright..."
Scan from DBHL, cleanup by theshadow.
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