Helicanth (oz2545)

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Helicanth (oz2545) by D Sibbick 1959 - plan thumbnail

About this Plan

Helicanth. Free flight power competition/sport model for 2.5 cc engines. From Model Aircraft, June 1959.

Quote: "THE, first Helicanth was built in September 1957, for an Oliver Tiger and it flew straight off the board with only a piece of 1/16 in packing under the trailing edge of the tailplane being added for finial trim. Encouraged by this, another was quickly built for an AM.35 but owing to the lightness of this engine it was found difficult to get the CG in the correct position, and this model was not so successful. The Mark III was the first one to have silk-covered wings, which gave great strength for a very small increase in weight.

The Oliver Tiger in the Mark I has been replaced by an ED 2.46, so that the Tiger could be installed in Mark IV. This was unfortunately lost for three days and when recovered had received extensive damage to the wings. However, a new pair were built and the model now flies slightly better than it did previously, best time being around the 11 min mark from a 10 sec engine run.

Fuselage. Start by cutting out the top and bottom from 3/32 in sheet, then formers F1-F5 from 1/8 in sheet - the remainder being cut from 3/32 in. Cement the formers along the bottom of the fuselage, and when dry add the 3/8 in sq hardwood engine bearers. The top can now be cemented on and pinned until dry.

The pylon is cut from three pieces of 1/4 in sheet which are joined together, two pieces of 1/2 in x 1/8 in balsa being placed across the top to strengthen, and form the wing-band retaining hooks. The whole is sanded smooth and securely cemented in a slot cut in the top of the main fuselage.

The fuel tank, made from shim steel, timer and cut-out can now be added, after which the sides are covered with 3/32 in sheet which overhangs at the back to form a slot for the fin..."

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Helicanth (oz2545) by D Sibbick 1959 - model pic

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