Model-shipways 28 User Manual download pdf (Page 19)

As you did with the ailerons on the lower wing, the horizontal stabilizer and the ver-

tical stabilizer (or fin) will be built with the elevator and the rudder attached and then

cut loose. Reference Figures 4/1 through 4/5 while you construct them on full-size

Plan D02.

PARTS LIST FOR STAGE 4:

WP3673-24 Leading edge brace 2 5/64 x 5/64 wood strips

WP3680-24 Diagonal brace 2 3/64 x 3/64 wood strips

WP3688-24 Fin attachment supports 2 .02 x 5/64 wood strips

WP40264 Elevator pivot rod 1 5/64 x 5 1/2 brass rod

WP40264 Rudder pivot rod 1 5/64 x 2 1/4 brass rod

WP3202-40 Stabilizer rim (laminated) 5 .02 x 5/32 Tanganyika wood strips

WP1860 Hinges 6 1/4” aluminum tape strips

WP3631-24 Stabilizer & elevator spars 2 1/8 x 1/8 wood strips ñ special prep

WP3660-24 Elevator brace 1 3/64 x 1/8 wood strip

WP3673-24 Fin braces 2 5/64 x 5/64 wood strips

WP3688-24 Ribs 14 .02 x 5/64 wood strips

Ni28-062 Control horns 2 Britannia metal

WP3202-40 Rudder rim (laminated) 5 .02 x 5/32 Tanganyika wood strips

WP3673-24 Vertical brace 1 5/64 x 5/64 wood strip

WP3660-24 Vertical brace 1 3/64 x 1/8 wood strip

WP3631-24 Rudder post & main spar 2 1/8 x 1/8 wood strips ñ special prep

J006 Stabilizer/elevator jig 1 laser-cut wood part 5/32 thick

J007 Fin/rudder jig 1 laser-cut wood part 5/32 thick

Stabilizer and elevator:

This one is the real test of your bent lamination skill. The stabilizer rim is a continu-

ous lamination that runs completely around both the stabilizer and the elevator. This ulti-

mately will give you the leading edge of the stabilizer and the trailing edge of the ele-

vator. Laminate the stabilizer rim using five Tanganyika wood strips(WP3202-40)

against jig J006 to form the correct shape. Make sure the glue is completely dry before

you unpin the shape from the jig.

Cut to length and glue in the stabilizer and elevator spars using 3x3mm wood

strips(WP3631-24). These require special preparation before attaching. One face must

be grooved into a shallow ìCî channel that will locate the pivot rod(WP40264) when the

grooved sides face each other. See Plan D02. The easiest way to cut the groove is to

score it the length of the strip with a razor saw, then to file the channel with a round rif-

fler

. The angle of the file end of a riffler to the center handle makes it easier to keep your

hand out of the way. It is important that the pivot rod not be completely enclosed when

sandwiched between these spars, otherwise the elevator will not operate.

The elevator brace is made from 1x3mm wood strip(WP3660-24), the fin braces and

the leading edge brace from 2x2mm wood strip(WP3673-24). Next add wood

strips(WP3688-24) to create the topside ribs in an airfoil contour. Turn the assembly

over and glue on the underside ribs, then add the two fin attachment supports from wood

strips(WP3688-24). When all is dry, saw through the rim and ribs where indicated in

Figure 4/3 to separate the elevator from the stabilizer.

Referring to full-size Plan D02 and Figure 4/4, cut four dadoes into the elevator spar

to clear the outside of the elevator hinges. Next, glue the elevator pivot rod(WP40264)

into the groove of the elevator spar

. Locate and attach the control horn(Ni28-062) to the

center of the elevator leading edge.

Finally, cut the indicated lengths from the

1/4” aluminum tape(WP1860). Carefully

fold the strip lengthwise in half, adhesive

side inside, then trim to 3/16” wide and

bend the hinges. They pass through the

slot created by gluing the pivot rod to the

elevator spar and are glued around the sta-

bilizer spar only

Fin and rudder:

The procedure for constructing the fin

and rudder is essentially the same as for

the stabilizer and elevator. Especial care

must be taken in building the fin because

the elevator control horn must later be

located within this structure.

Begin by forming the rim from five

wood strips(WP3202-40) around jig J007.

Prepare the rudder post and main

spar(WP3631-24) with a groove, as you

did for the stabilizer and elevator spars.

Glue these in place, making sure the

grooves face each other. Make the leading

edge brace from WP3673-24, vertical

braces from WP3673-24 and WP3660-24

as indicated, and diagonal braces from

WP3680-24. Complete this step by

adding the ribs from WP3688-241 to

achieve a like curvature on both sides.

Note how the ribs are paired on both sides

of the horizontal joint between the fin and

the rudder (Plan D02).

Referring to full-size Plan D02, saw the

rudder from the fin and cut two dadoes

into the rudder spar. Attach the rudder

pivot rod(WP40264) to the rudder spar

and make hinges from the aluminum

tape(WP1860) the same way you did for

the elevator. Finally, locate and attach the

control horn(Ni28-062) to the rudder.

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Model-shipways 28 User Manual Page 19

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