About this Plan
Kittyhawk. Control line semi-scale stunt model.
Quote: "Kittyhawk. Bill Draper's 54 in span semi-scale control line stunter for 0.35 - 0.45 motors.
AFTER DESIGNING and building a succession of purely aerobatic models, I decided to try a semi-scale model which would not be too badly 'distorted', whilst still providing an aerobatic performance. Consequently I required a prototype which featured a short moment arm, long nose, plus generous wing and tail areas.
The Kittyhawk filled these requirements; the fuselage was not too bulky, whilst the almost complete lack of wing leading edge taper would make for easy building. The wing tips are sufficiently rounded to prevent turbulence and offset the lack of wing taper, while it is easily recognisable by the public, particularly when finished in combat colours - I chose the desert colours of 112 Squadron of the RAF, since these are especially distinctive and well known.
The model has been designed for toughness, and will take the 'rough and tumble' of club flying - in my view too many stunt models have been designed by experts just to be flown by experts. They often do not have the ability to take the knocks which are regularly metered out by the average flier on his local field, and consequently soon crack up.
Using the construction and nylon covering as shown, there should be no difficulty in building the finished model at 50 to 52 oz; not a lightweight agreed, but the model is fully aerobatic and strong. At these weights, one of the more powerful 35's such as Merco, Enya or OS will perform comfortably, but for a less powerful motor, then a little lightening down to 45 to 48 oz may be of advantage, but with some loss of ruggedness. For instance, covering in tissue instead of nylon would save about 1-1/2 oz, while Solarfilm on the wing will save even more, but a scale type finish is then much more difficult to achieve.
Do not try to lighten the wing centre section. This area is under great stress, particularly when performing fast manoeuvres in a high wind when the distributed load on the wing may reach 150-200 pounds at the bottom of the manoeuvres, and about 60 per cent of this is supported by the centre section. The undercarriage positioning will give good take off and landing characteristics on grass without tending to nose over, whilst still allowing smooth landings on tarmac. The long torsion bar will ibrgive that extra large lump of grass without ripping the undercarriage from the wing.
Now for some comments on construction. Although designed for the club flier, it is fair to assume that this class of model would not be chosen as a first attempt, and that the builder has a reasonable degree of building experience.
Wing:Using carbon paper, transfer the outline of wing rib W2 onto a piece of 1/16 ply as a template. Cut ribs W2 from the template, remembering that the extreme outer ribs are 1/8 thick. The four W1 centre section ribs, and the half ribs can also be cut using the same template, but will then require trimming down a further 1/16 ahead of, and 1/8 behind, the main spar to allow for the extra sheeting thickness.
Lay the inboard wing ribs on the plan and mark the position of the leadout on each rib. Cut out the leadout clearance holes - the centre ribs will require 3/4 in long slots, to allow for the leadouts pulling closer together as the bellcrank rotates..."
Kittyhawk, Aeromodeller, December 1974.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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