Oldtimer XXL-59
Building instructions - Oldtimer XXL-59
5
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Sand the bottom in-fill panel to form a perfectly flat support surface between the leading edge V06 and the trailing
edge V05, i.e. not following the undercambered airfoil. In contrast, the in-fill panel in the top surface should be
sanded to follow the camber of the airfoil.
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Glue the gussets V12 and the elevator in-fill piece V11 in place.
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Give the whole tailplane a final overall sanding, then separate the elevator from the panel using a thin knife-blade.
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Sand the leading edge of the elevator at an angle, so that it can be
attached using a tape hinge on the top surface. Note that the hinge
should not be fitted until the model has been covered and painted.
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To attach the tailplane to the tail end of the fuselage, drill a 3 mm Ø hole
exactly in the centre of the tailplane from above, located 3 mm aft of the
main spar.
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Mark the position of the hole on the fuselage.
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Glue the plastic captive M3 nut to the inside of the fuselage, exactly in
line with the hole. The tailplane can now be fixed in place using the 3
mm plastic screw supplied.
The wing
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The wing jig must be assembled using white glue before the wing can
be built. Check that the parts fit together snugly; the cutter leaves
slightly rounded corners, and it may be necessary to trim them ‘square’.
The wing pylon
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Glue the plywood part T10 between the balsa components T11 and T12.
Check that the pre-drilled holes are aligned accurately with each other.
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Press the two cruciform reinforcements T13 into place, and glue them
with thin cyano.
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Sand the surfaces perfectly flat, including the top surface of the pylon
itself.
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Fit the aluminium tube through the front hole and check that it is exactly
horizontal and at right-angles to the centreline. Adjust the hole with a
small round file if necessary.
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It is important to roughen (sand) the centre of the tube thoroughly over a
distance of 25 mm before gluing it in the pylon using 5-minute epoxy.
The assembly must be placed in the building jig to align the parts.
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Now slip the plywood ribs T14 on the tube on both sides, and glue them
to the sides of the wing pylon. Once again, check that the rear holes for
the incidence peg line up accurately.
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Cut off the excess aluminium tube on both sides before sanding the
surface of the plywood ribs flat and flush. Place the remaining
aluminium tube to one side, as it is needed later when the wing is built.
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Sand the top face of the wing pylon flush with the plywood ribs, then
sand the whole pylon to a slightly streamlined shape as shown. Take
care not to round off the ribs, as the root ribs of the wing panels must
line up accurately with these parts.
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Insert the rear incidence peg No. 10, leaving it projecting by an equal
length of both sides; a small drop of cyano will hold it in place.
Caution:
don’t glue the pylon to the fuselage at this stage; place it on one
side for the moment. The reason is that it can only be aligned correctly with
the help of the completed wing panels.
Inboard wing panels
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We recommend that you build the left and right wings at the same time, starting with the long inboard panels.
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The first step is to cover the building board with clear plastic film.
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Pin down the trailing edge K15 on the building board, packing up the extreme front edge (under the notches) with
strips of 1 mm thick wood or card. These packing pieces should be under the plastic film, otherwise they will become
stuck to the wing.
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Write the part number on each rib before separating them from the machine-cut sheets.
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Start with the ribs K05: insert all of them in the trailing edge and the notched leading edge K18. Take care to leave
space left and right for the ribs K02, K03, K04, K06 and K07.
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Once all the K05 ribs are inserted, weight the assembly down on the building board, and set the ribs at right-angles
to the leading and trailing edges.
Tip:
small pieces of clean steel from the scrap box of your friendly local metal-working shop are very useful here.
