17.
Screw into position the two wing servos, mounting them from the underside of the wing, with the servo arm
shafts facing towards the tip of the wing. Feed the servo leads through holes towards the centre of the wing
and connect them to a suitable ‘Y’ servo lead.
18.
Gently sand the wing to remove any lumps and bumps and to round the leading and trailing edges as well
as the wing tips. The wings are now ready to be covered. Note: Leave a 3mm wide strip along the centre of the
top and underside of the tail plane uncovered to allow the glue to create a strong bond between the fin and tai
plane.
Construct the Ailerons
1.
From Sheet 4 remove the two aileron bases and the leading edge spars. Build the two aileron together to
ensure that a left and a right hand aileron is built!
2.
Dry assemble the leading-edge spars onto the aileron bases with the etched dotted line on the spar facing
away from the base.
3.
Locate and remove the aileron ribs ‘A7’ to ‘A11’ from Sheet 5. Dry assemble the ribs into the correct slots on
the aileron bases and LE spars, ensuring that the end ribs ‘A7’ and ‘A11’ are at right angles to the base
together with the LE spar.
4.
Stick the end ribs to the base and the LE spar, and then stick the remaining ribs into place.
5.
The leading edges of both ailerons need to be bevelled to allow them to move freely.
6.
Stick masking (scotch) tape along the etched dotted line covering the lower part of the spar. Tape some fine
sand paper onto a flat surface and sand the unmasked part of the spar to create a bevel that is flush with the
top front edge of the ribs.
7.
Remove the tape and apply some more masking tape, this time covering the bevelled upper part of the spar
and along the etched dotted line. Sand a bevel to the same angle as the top. Do this for both ailerons.
8.
Gently sand the ailerons to remove any lumps and bumps and to round the trailing edges. Check that the
aileron fits into its slot on the wing and can move freely. If it does not, then lightly sand the end ribs of the
ailerons until they can move without interference. The ailerons are now ready to be covered.
Final Assembly and
‘Xtra Detail Sheet 11’
1
. When all parts have been covered, start with assembling the elevators to the tail plane. Insert four Mylar
hinges into the slots cut previously (cut the covering if required) in the TE of the tailplane and make sure half
the length of the Mylar hinge is in the slot. Test fit the elevator; the control horn slot should be on the left-hand
side. Insert the Mylar hinges into the slots with the elevator is aligned to the tail plane and with its LE about
0.5mm from the tail plan, check that the elevator tips don’t interfere with the tail plane when it is flexed up and
down. Remove the elevators, and after making sure that the hinges are correctly located wick CA into the join
between the Mylar hinge and the tail plane. Allow the glue to set and check the security of the hinges. Then re-
assemble the elevator into position and check its alignment etc. before wicking CA into the join around the
hinges. Gently flex the elevator for a few minutes while the glue sets to prevent the tail plane and elevators
sticking together. Check that the elevators are securely attached to the four hinges.
2.
On the underside of the tail plane remove the covering from the two tail plane bracing slots and also remove
the covering from the underside of the elevator horn slot.
3.
Remove the covering from the tail plane brace slots either side of the fuselage.
4.
Insert the tail plane/elevator assembly into the slot in the fin. Make sure it is fully home, DO NOT apply glue
at this stage.
5.
Locate and remove the two plywood tail plane braces from sheet 10. Note which ends are marked ‘FUS’ and
‘TP’. The braces are structural and support the tail plane, so need to be fitted. It is advised that they are
covered before fitting, leaving a small area at each end uncovered to allow for secure glued joints.
Balsa Basics Messerschmitt Bf 109 Vintage Model Company
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