Chobham Hawk (oz8915)
About this Plan
Chobham Hawk. A 108 in wingspan glider for thermal or slope soaring with single channel radio control.
Quote: "Chobham Hawk is the outcome of some twenty years of experience (including own-designed full-size gliders) and although the designer has flown multi radio control, he still prefers the simplicty and challenge of rudder only control.
This large model with its modern (modified Wortmann FX 61) wing section may be used both as a slope or a thermal soarer, so the builder is presented with a practical flying machine whether it be windy or calm! The 'T' tail is in keeping with modern trends and its simple yet rugged structure should be well within the capabilities of any modeller with a little previous experience of similar models.
Naturally the best form of control is proportional radio, the designer having used a single-channel Simprop unit, imported from Germany, as there was no other similar equipment available. However, this position has now changed as Waltron Electronics have introduced the Mini 1-2, and Mainstream have likewise produced the Gem Digi 1 - both very reasonably priced and ideal for this model. Should you prefer to use the conventional (and cheaper) form of 'bang-bang' single channel, then plan the position of your equipment and any modifications which may be needed before cutting out any balsa.
It will be found useful to have a quantity of wooden clothes pegs handy when building this model, as they make very good temporary clamps, especially when cut-back at the ends so that they nip the joint as soon as they are applied. Also, some 1/8 plywood blocks, size 1/2 x 3/4 in will come in useful, as will a softwood block size 1-1/2 x 1-1/2 x 9 in long, with one face bevelled to 18°.
Commence building by cutting out two fuselage sides from 1mm or even 1.5mm plywood and adding all longerons and uprights, but omitting the 1/8 x 1/8 posts at the rear end, as shown in section F2. Cut out the 1mm ply floor to shape and glue on top of the lower longerons, followed by the noseblock and cross braces forward of the wing trailing edge. This completes the first stage of construction. The fin and rudder structures are next to be made, and the plan should be carefully studied to reveal their construction..."
Chobham Hawk, Aeromodeller, June 1971
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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