Heinkel Stunter. Control line stunt model.
Quote: "WHEN construction started on this model last winter, it was intended to duplicate the author's previous model named Skylady, a development of the Skilat (squirrel) by Luciano Compostella which has so strongly influenced the stunt trend in Italy.
The problem was that perhaps too many Skilais have been built in Italy during the last two years so that the design is now rather commonplace. It was decided that it would be better to personalise the new model in some way, without losing anything of the very remarkable flying characteristics of its ancestors. A good semi-scale effect seemed to be the right solution. When research for a suitable aircraft was commenced it was obvious that the choice was not too wide owing to.the upright engine. In fact only WWII fighters developed around Daimler Benz 601 could be considered.
After discarding the Tony and Macchi 202 which were already being flown by other modellers, the designer's attention was caught by the Heinkel 100 which, though not so renowned, had the advantage of being particularly suitable.
If readers compare the plan of my model with drawings of the real aircraft (see War Planes of the Second World War, Fighters Volume One by W Green or the monograph by Aero Publishers of USA) they will easily discover that details of this model are not to scale. This is because the first object was to have a 100 per cent competitive stunter so the proportions and surfaces of the previous Skylady were not altered. After more than a hundred flights, the Heinkel is still in perfect condition and this proves that the basic design is functional and exempt from substantial errors. It can be recommended to those flyers who Like to have a good-looking semi-scale stunter which is not too difficult to build.
Construction. The original model was powered by a Fox 35 and weighed 45 ozs. without fuel. Flying characteristics can be still further improved by reducing weight to approximately 43 ozs. This can be achieved with a careful selection of balsa and a light finish.
The wing should be built first as the model is constructed around it. The wing has a 'Er tube structure which is now traditional in stunt. The main advantage is a high torsional strength which practi-cally eliminates the danger of warps due to covering. On the other hand, it must be carefully built to avoid built-in warps which are very difficult to remove, and can seriously affect the model's flight behaviour. Keeping this in mind check critically your building board; if it is not absolutely rigid and flat do not hesitate to replace it. The spar is slotted from the ribs which are then glued on using a PVA glue as this does not shrink. The 10 swg landing gear is mounted with J bolts onto the respective ribs before they are glued to the spar. By constructing the wing upside down, blocks may be placed under the LE and TE, to assure accurate setting of the parts. Be sure to position the spar correctly on the board, otherwise one risks getting the shorter panel on the inside!
Wing tips are carved from 2 in. balsa block. Only the inboard tip is hollowed..."
Heinkel Stunter, Aeromodeller, September 1969.
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Article pages, thanks to RFJ.
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