Upbury Convertible (oz5027)

About this Plan

Upbury Convertible. Free flight model. A dual purpose model for .75 to 1cc motors. Plan shows two sizes of wing, at 48in and 36in. From May 1965, Model Aircraft.

Quote: "FULL SIZE PLAN. A dual-purpose model for .75 to 1 cc. Upburys Convertible, by G Elsegood.

THE model started life as a follow up design to the Upburys (oz5760) featured in the June 1964, Model Aircraft. It was designed as a semi-scale model of the Slingsby Prefect sailplane because the lads in the club wanted something that looked like a real 'plane. At the same time, however, some members of the club were acquiring small glow and diesel engines and wanted a suitable F/F model for them. The idea occurred to me that with a little modification the semi-scale glider could become a power model as well as a glider, so the Convertible was born. The strut fittings have, so far, proved well able to stand violent contact with trees, fences and mother earth, and the complete model will pack into a box only 25 x 5 x 5 in.

Construction. Fuselage. The entire fuselage except for former A is cut from 3/32 in med hard sheet. Make sure that the tow hook is bound to the strip of 1/4 in square balsa and cement securely to the bottom 3/32 in sheet before assembly.

Before fitting former A use it as a jig for drilling holes (3/16 dia) in former B and in the glider noseblock, this will ensure that the locating dowels fit accurately. Cement on the 1/16 in ply root ribs and strut plate.

Nose Assemblies. Make up the power nose (using 1/4 in sq or 1/4 x 5/16 in hardwood bearers. (These are shown spaced for a Mills 75; if using a different engine, the spacing may have to be adjusted) and glue and screw on the 1/8 in ply side pieces and former B.

The glider nose on the original model was made from a piece of hardwood, but balsa may be used drill a 3/8 in hole for trimming ballast and fit the wire hooks to retain the nose.

Wings. The construction methods for each set of wings is identical. The glider wings are each 24 in long, the TE tapering for the last 6 in and the power wings are parallel and are each 18 in long. Cover the LE of the wings with soft 1/4 in sheet..."

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Supplementary file notes

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