CB model designs CBMD-002 Manual Konstruksi - Halaman 6

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doubler horizontal for strength. Remove all the rest of the filler pieces for the fuselage side frames

from the laser cut sheets for installation during assembly.

Begin construction by positioning the main fuselage longerons. These four long pieces of 3/32

square are segregated in the kit and cut from the same balsa stock for uniform stiffness. These

should form easily to the shape on the drawing; if necessary soak the forward ends of the longeron

in water to ease the forming of the curve at the forward end of the fuselage. Use scrap balsa

blocks to maintain the position of the longerons to the plan outline, as done for the wing tip bows.

Make the longeron conform to the outer edge of the drawing profile to avoid any mismatch between

the two sides. Do not pin through any of the longerons, use blocking to control position and to hold

against the building board if necessary.

Some builders prefer to construct this style of frame by starting with the upper longeron in place,

and then installing all the other vertical members and diagonal bracing with excess left at the lower

longeron joints. These members are then trimmed to match the plan at these points, and the lower

longeron installed against the trimmed ends of these members. This method produces very good

joint quality, and is somewhat easier to assemble than installing the upper and lower longerons to

start, and fitting all the vertical members in between. Both methods are capable of producing

quality joints if care is taken in trimming everything to match exactly. Whichever method is chosen,

make sure the outer edge profile of the fuselage frames are matching the drawing. Use new, sharp

single edge razor blades for construction of the fuselage frames.

It is also suggested that the filler parts F-3, F-4, F-6, F17 are positioned prior to installation of

diagonal bracing to allow accurate fit against the three surfaces they are bounded by.

Use of white or aliphatic resin glue is suggested for fuselage frame assembly. Moistening the ends

of the 3/32 square and 1/16 x 3/32 members prior to glue application will improve joint strength by

allowing the glue to penetrate the end grain. Allow the fuselage frames to dry completely before

removing from the building board. Use a 220 grit sanding block to lightly sand the inboard side of

the frames to level any mismatching vertical member surfaces to the longerons prior to taking up

the frames.

Cover the plan view of the fuselage with wax paper, to the extent of the fuselage bottom flat area.

Assemble the fuselage box in place over the top view of the fuselage on the drawing. Measure the

constant width section cross members and cut enough of these from the 3/32 square and 1/16 x

3/32 strip to install at each location. Also cut all the variable width cross members per the upper

plan view in pairs to allow installation top and bottom as you assemble the fuselage box. Align the

fuselage sides to the vertical members at the front of the wing area to start. Place a piece of wood

or other large flat sided object at the front of the fuselage frames to provide a forward and aft

reference stop for the two sides, based on creating the front end with no right thrust built in (this is

added after assembly). Use 90 degree blocks or stops to square up the fuselage sides and

maintain position during the assembly process.

Begin assembly by pinning scrap balsa blocking to the plan on the forward side of the constant

cross section 3/32 sq members, at the bottom of the fuselage. Position the pre-cut 3/32 cross

members against these blocks, held against them by pins, and aligned such that the ends are

touching the longeron profile on the drawing. Now position the fuselage side frames (on the bottom

flat area) against these cross members, holding them square to the building board with blocking

and against the cut ends of the cross members. Adjust the sides until the forward ends are

touching the blocking placed on the plan from the previous setup step. The cross members and

vertical members of the side frames common to these should be in alignment, and both sides of the