Macchi MB-308 (oz5596)

About this Plan

Macchi MB-308. Free flight scale model, for either rubber or CO2 power.

Quote: "A design to warm the heart of any builder of rubber-powered flying scale models. This neat job also takes Campus A-100. Macchi MB-308, by Christo Russo.

ITALY'S top offering to the lightplane enthusiast, the MB-308, bids fair to become the favorite of all Europe. The wing is of a tapered cantilever design coupled with a simple fuselage of neat, compact design seating two side-by-side. Tricycle landing gear or twin floats may be used. It is sold with or without a motor; the continental A-65. is the recommended power. The price is $3-5,000; no accurate means of computing cost is available due to fluctuating European currency. Span is 32 ft 9-1/2 in; length overall 21 ft 3-1/2 in.

Ideally suited to a stable flying design, the MB-308 is presented here as a small scale job for T-56 rubber or CO2 power. The model shown in the photos uses a Campus A-100 motor. Construction is simple and light. Use carefully selected balsa as specified.

Build two body sides on the plan side view. Assemble them as per top view and attach bulkheads and stringers, using hard 1/16 sq throughout. Trace the nose block on soft balsa blocks; cut to outline shape; carve to contour; sand and give several coats of clear dope, sanding between coats. Cut the blocks in half and with a small gouge, hollow to the wall thickness shown. Cement together and attach to nose of fuselage. Bend and insert wire landing gear. Wheels are of balsa or celluloid. Small Trexler pneumatics may be used.

Stabilizer and rudder are of conventional construction. Exercise care to prevent any warpage. Cover with Jap tissue and water-spray. Give one thin coat of clear dope (use eight parts thinner to two parts dope).

Make a template from tin can metal of the largest rib (center). Proceed to cut ribs of 1/16 sheet balsa. Make a cut along the top surface; move the template down 1/16 in and make another cut. Thus you have a rib 1/16 square. Cut sufficient ribs for top and bottom surfaces of the wing. Do not trim to proper length until assembly..."

Direct submission to Outerzone.

Update 08/04/2019: Added article, thanks to RFJ.

Supplementary file notes

Article.

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