Number 96a (oz10844)
About this Plan
Number 96a. St Albans Open Glider. An 84 inch contest glider model.
Quote: "Designed by the experts of one of the leading clubs. Proved in three contest seasons. Easy to build and fly with simple lines for inexpensive and very quick construction. St. Albans' open glider.
DURING THE LAST ten years, preoccupation of model glider enthusiasts with the A/2 class has tended to leave the large, open class, glider out of favour. Prior to this decade of ascendency of the international class in competition, the Open Glider reigned supreme. Results of the 1961 rallies indicate that the 'wheel of progress' has swung full circle and that this type is, once again beginning to command greater interest. Experts such as Jim Baguley and Laurie Barr have used this type in competition for some time, but perhaps the greatest 1961 success story comes from that consortium of experts in the St Albans MAC, B Cox, J Simeons, I Crawshaw, D Tipper and G Fuller, (who represent four aircraft companies and a leading model wholesaler) responsible for Number 96a presented here.
The design has, in the last three seasons, amassed a fine record of achievement, including three 1st places at the South Midland Area Rally and in the Model Engineer Cup for 1961 and 1959, 2nd places at the 1959 Devon Rally, and Croydon Slope Soaring Rally, 3rd places at the 1959 Surbiton Gala and 1961 Model Engineer.
Planned at the St. Albans permanent clubroom, Number 96a was originally intended to be a lightweight of around 16 oz, but subsequent experiments proved the performance of a 20 oz example to be superior.
Eight prototypes have flown, ail but one having placed high in competition. The last three performed straight from the building board with no adjustment to rigging, weight or turn!
Begin construction with the fuselage, cutting sides from medium 1/8 sheet, 4 in wide for the nose section. Scarf join the sheet sides around F.10, arranging the joints in opposite directions. Cut F.5 and F.7, again from 1/8 in medium sheet and assemble with the fuselage sides. Cut the remaining formers from soft sheet to save weight and cement all but F.5a and F.6a into the fuselage where indicated on the plan. The fuselage bottom is 1/8 in medium sheet scarf jointed around F.3 and cemented in place.
The 1/8 ply plate is cemented to the floor ahead of F.6 through the top of the fuselage. This is to hold screws for the 20 swg dural plate wing brace stay, after the completed fuselage is sanded. Bind and cement the formed 16 swg towhook to a 1/2 x 1/4 hard balsa strip and cement the assembly to the base. Now fit remaining formers F.5a and F.6a then add wing and tailplane rests ensuring that they are at 90 degrees to the fuselage sides.
Cement metal tube sleeving for auto-rudder line through the fuselage sides at F.7 and behind F.15 and thread Nylon cord through these tubes, entering the fuselage at F.7 and reappearing at the rear tube. Now sheet the top crossgrain, with 1/8 in balsa.
Sand the fin to shape and symmetrical section from 1/4 in sheet, separating the rudder and cementing a metal tube to its leading edge. Insert 20 swg wire hinge pin through the base of the fin, through the rudder tube and up, burying it into the wood above. Cement this assembly to the fuselage, and add the underfin, ensuring that both fin components are vertical to fuselage. Carve pine or hardwood noseblock and attach to F.1, followed by 20 swg wire nose skid... "
Number 96a, Aeromodeller, February 1962.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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