Macchi Castoldi MC-72 (oz1551)


Macchi Castoldi MC-72 (oz1551) by Ettore Bizzozero 1961 - plan thumbnail

About this Plan

Macchi Castoldi MC-72. A 25.75 in span C/L scale seaplane, for 2.5cc power. From 1961 Aeromodeller May issue.

Quote: "A thrilling scale control-line floatplane for 2.5 cc. Ettore Bizzozero's Macchi Castoldi MC-72.

On June 2nd 1933, Italian pilot Warrant Officer Francesco Agello flew the Macchi-Castoldi MC-72 four times over 3 km on Lake Garda, to average a then breathtaking speed of 440 mph. This speed made official at 440.7 in 1934 was not exceeded for six years and then by a landplane. Few people realise however that, to this day, that aircraft still holds the world speed record for floatplanes.

Italian modeller Ettore Bizzozero, has produced this miniature MC-72 for a Webra Mach I diesel of 2.5 cc. His clever counter-rotating airscrew and choice of engine are variables which can be changed and for any modeller wanting to try his hand at fast scale control-lining - this is the bird to build!

The fuselage can be constructed either from hard balsa or from yellow pine, depending on the builder's preference. The original yellow pine fuselage is made in two halves - top and bottom, dividing along the datum line. Note that the fairings on the upper half are super-imposed later. Lightly cement the two block halves together and carve the external shape, using templates as a guide to accurate carving. Sand smooth and part the two halves so that the inside of the fuselage can be hollowed out to 1/16 in walls.

Make a close study of the nose portion of the fuselage to understand the internal contours where the engine is integrally mounted. Particular attention must be paid to this part of the lower half, the mount being slotted to take the motor lugs, to achieve the required housing for the engine intended for installation. Now make up the bellcrank pivot block from 3/8 x 1/2 in hardwood, complete with pivot bolt, cement it in position and reinforce with ply keepers. If the fuselage is to be constructed from hard balsa, a wall thickness of 1/8 in is desirable and separate hardwood engine bearers will be necessary, fitted into the fuselage as shown on the plan detail. Use a good strong glue for this job.

Shape and notch the 3/16 x 3/4 in wing TE and pin in position over the plan packing up from the plan with scrap 3/32 in going likewise for the two lower..."

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Macchi Castoldi MC-72 (oz1551) by Ettore Bizzozero 1961 - model pic


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