Poltergeist - Radio contol slope soarer. Uses a solid balsa wing construction method. Plan shows two wings, original 50in wingspan and alternate high aspect ratio 73in wingspan.
Quote: "Created as a sport soarer with good looks and a crisp performance, Poltergeist is the third in a series of models designed around the concept of a solid balsa wing. The model flew first with the 50in wing, the 73in high aspect-ratio wings being introduced later to fit the same fuselage and tail assembly. In both guises the model has exceeded its designer's original expectations.
Thin section wings provide a fast, flat glide that gives Poltergeist an exceptional performance in varying conditions of wind speed and slope lift. Fitted with the 73in wing a useful thermal soarer is produced, particularily effective when conditions are such that a model has to move rapidly between patches of lift.
An important aspect of the evaluation exercise was to ensure that the wings could be rapidly swapped without it being necessary to adjust the CG or the control trims. This has all but been achieved, a wing change taking less than 5 minutes, requiring only a minor change in the elevator trim and a change of aileron linkages.
Three evaluation models, each differing slightly, were built and the best features from each have been incorporated in Poltergeist. The model exhibits no particular vices, although its neutral stability and faster-than-usual flying speed de-mand an experienced pilot.
Construction: Wings. The May 1979 edition of Radio Modeller contains a detailed article devoted to the production of a pair of wings from solid sheet balsa - the basis of this design. I have found it all too easy to become hooked on the solid balsa wing, primarily because of the simplicity and rapidity of construction. Briefly, then; after cutting the wing blank, the first task before shaping the aerofoil is to produce the triangular flat area on the underside of the wing tip to obtain a controlled amount of wash-out. The wing panels may then be shaped separately as described in the aforementioned issue of RM, and when complete the ailerons cut out of the panel. Check that the cut end of the wing root is square, and then the two panels may be joined by brushing PVA glue thoroughly into the end grain of the wood and taping the panels together..."
Poltergeist, Radio Modeller, August 1979.
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Article pages, thanks to RFJ.
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