About this Plan
Vertex. Radio control sailplane, for slope or thermal. Wingspan 72 in, wing area 414 sq in.
Quote: "Looking for a super lightweight flat field floater for those approaching calm summer evenings, or a manageable sloper when the lift's light? Stefan Baker's elegant 72 inch two-channel drifter represents an ideal project, made even more enjoyable by these highly detailed step-by-step building notes .
Vertex is a thermal soaring glider which is both economical and straightforward to build, using these comprehensive instructions and simple plan. Having detachable front wings makes it a doddle to assemble and disassemble on the hill and it will fit easily into the boot or even on the parcel shelf of your car. The model has a very light wing loading, and this coupled with the fact it has an under-cambered wing section, means it can stay aloft when other models struggle to attain adequate lift. This also makes the model very slow flying for its size, giving the novice pilot time to bring the glider back to earth safely.
Laminating balsa sheet: Take a sheet of 1/32 balsa and lay it flat on the building board. Then glue on top, using Evostik, 4 inch square pieces of 1/16 balsa, running the grain in the opposite direction, as shown in the diagram. Then glue another 1/32 sheet on top of that, making a kind of sandwich. Place a heavy weight on top, and leave until completely dry. When completely dry, cut parts, F1 to F7, tail skid, wing end caps, plus C1 and C2. See sketch.
So now let's build in earnest - just follow these 87 steps to heaven!
1. Cut out two sides from 1/32 sheet balsa; the shapes for these are marked on the plan by small solid arrows.
2. Cut out two ply doublers from 1/32 sheet ply. Follow the shape depicted by the larger solid arrows for these.
3. Glue the doublers to the sides (making a left and right hand). The doublers go to the inside when building. Glue with white wood glue.
4. Mark the wing dowel holes on the right hand side, as shown on the plan, then place the sides together and drill the wing dowel holes out with a 3.5mm drill.
5. Cut out the cockpit sides as per plan. The shape you need is marked on the plan by open arrows.
6. Cut and fit the 1/8 x 1/8 longerons at top and bottom of fuselage as drawn.
7. Cut and fit the 1/8 balsa fillets at the rear of the fuselage on both left and right hand sides.
8. Mark the positions of formers F1 to F6 on the inside of the fuselage sides..."
Vertex, Radio Modeller, June 1995.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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