CB model designs Yard Stick Manual Konstruksi - Halaman 2

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Thank you for purchasing a Yard Stick kit. We hope you will find building and flying the Yard

Stick one of the pleasurable things in life and achieve many hours of enjoyment from it.

Wing Construction

Cover the wing plan section with wax or parchment paper prior to construction to prevent parts

sticking to the drawing.

Begin wing construction by laminating the left and right hand leading edge bows from three

layers of 1/32 x 3/16 balsa. These parts are easily formed directly over the plan by pinning scrap

balsa blocks to the board and forming the strips against them to maintain the profile shown on

the drawing. Adjust blocks to control the profile to the outside edge on the drawing, and to the

mating joint for T-4. Achieve this using the stock with no glue applied. Once this setup is

established, use a thin coat of white glue between the three layers of balsa and reposition

against the blocks on the plan and against the building board surface. Make sure there is excess

material inboard of the polyhedral break-this will be trimmed back at the joint location once the

bow laminations have dried.

While the bow adhesive is drying, assemble the wing tip segments T-1, T-2, T-3 and T-4 directly

over the plan. Use white glue at the joints and position each segment to match the drawing. Use

pins placed against the sides of the parts to maintain position, as pin placed through the parts

may cause splitting or otherwise weaken the final product, which will be sanded to a tapered

section to match the airfoil contour.

While the tip trailing edge assembly is drying, position the laser cut trailing edge segments to the

plan. It is suggested to use a balsa strip pinned to the building board along the edge of the

trailing edge line on the plan to support the location of the trailing edge segments during

assembly. The same suggestion applies to the leading edge segment installation as well, as

both boundaries of the wing will be well controlled dimensionally if this is done.

When the tip bows are dried, remove any blocking near the polyhedral joint to allow access for

trim of the bow. Use the laser cut leading edge segment end as an angle gauge to mark the cut

line for the polyhedral joint onto the tip bow. Use a new, sharp razor to cleanly cut the tip bow

along this line. Locate the leading edge segments in position over the plan based on the

dihedral and polyhedral joint locations. All segments should touch at the bottom edge. Block the

leading edge segments against the strip stock used to control the boundary. Again, avoid pins

through both the leading and trailing edge segments, as these items get much thinner during the

finishing steps of the wing construction and will be weakened by pin holes.

When the tip trailing edge assembly is dry, remove from the plan. This section will be installed

off the plan based on the rib geometry and offsets for undercamber. Position the inboard and

outboard main spars over the plan using scrap balsa blocking pinned to the plan to maintain

vertical position as well as forward and aft position. Note-the lower side of the spar has standoff

tabs for proper offset for the rib undercamber. The wing leading edge bows should be left in

position on the drawing as they were during lamination and trim for the polyhedral joint. Fit the

tip trailing edge assembly in place over the top of the main spar, against the trailing edge

segment at the polyhedral joint, and against the backside of the leading edge laminated bow.

Use a few scrap balsa blocks pinned at the edge of the tip outline on the drawing to control the

boundary of the trailing edge segment as you best fit all the joints. Do not glue anything yet.

Position wing ribs W-2, W-3 and W-4 over the main spar according to notches in the spar. Best