About this Plan
Shrike. C/L combat model from Aeromodeller September 1956. Sept-forward wing design, for engines from 2.5 to 3.5cc.
Quote: "A new shape in control-line models for sport aerobatics or aggressive combat flying. Extra simple structure reduces building time to three evenings. Why not try one? Shrike, designed by W Courtier.
COMBAT FLYING is catching on fast and everyone is looking for a model that can be built with a minimum of time and expense, yet still stand up to the rough and tumble of occasional crashes and will retain a reasonable appearance. Why not consider this swept forward wing for your next controline model?
The Shrike is fully acrobatic, although it takes quite an amount of height to execute a vertical eight and it is by virtue of its planform, quite fast on the end of a pair of tines. It suits any engine from 2.5 to 5 cc, but as most of the Combat regulations limit maximum capacity to 3,5 cc, this capacity is recommended.
Construction: Building commences by mitre joining the leading and trailing edges at the correct sweep angles and reinforcing this joint with cement masked cloth or gauze. Leave these parts to set completely whilst cutting out other components, notably the 3/16 fuselage sides which have holes cut out for the leading and trailing edges. Pin the sides around the stout 5/8 square hardwood engine bearers and check to see that the holes cut for the leading and trailing edges of the wing are correct. If this is satisfactory the fuselage can be dismantled and the bearers cemented firm on one side And then fit the bellcrank pivot bolt to the upper bearer, fit spacers and also the LE, TE spar and the 3/16 'tailplane', threading on the second side.
Fit ribs W.7 with the assembly over the plan as these enable the wing to be chocked for accuracy, then revert to W.1, working outwards to each tip by applying 3/32 strip rib contours 'blocked' out from the spar and trailing edge. If medium hard sheet is used to strip the 3/32 caps, it will be found that the contour follows automatically, and construction is remarkably quick. 1/4 in square spacers between upper and lower contours are a wise precaution against breakage when the model is subsequently handled.
Finish with ribs W.5 and 6, add the tip fins and 3/4 ounce balance weight in the outer tip, the line guide and then fit the bellcrank assembly. The elevator is tape hinged in the conventional manner to the 'tailplane' and connected to the push rod, which is external and easily adjusted. Finish by adding 1/4 in sheet top and bottom to the fuselage, the offset fin and mount the engine and tank.
Cover the model with heavyweight Modelspan tissue, using several coats of den dope before colour doping to suit your personal choice.
In flight the Shrike is steady as a rock and gives a steady pull on the lines no matter what the atitude of the model. Unlike the conventional 'point first' delta, it is extremely ready to execute all aerobatics and its appearance at any model meeting is guaranteed to cause a stir - why not be the first with one at your club?"
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