Carf-Models Ultra Lightning Instruction Manual page 21

the wing in 8 positions (as shown in the photo below), diam-
eter 1.7mm for the small 2.2 Ø x 10mm sheetmetal screws.
Open up the holes in the cover only to 2.2mm Ø. Cut 8 small
squares of ply (from the 12mm wide strip supplied) and glue
these underneath the wing skin with thin CA to cover the
holes as reinforcement for the screws (photo P32). Redrill
the wing lip holes thru' the ply pieces Ø 1.8mm. Cut a notch
in the corner to clear the aileron linkage and screw the cover
in position.
With the retract and oleo leg installed, check that the door
slot in the servo cover plate clears the bottom of the leg
when the gear is in the 'down' position by about 5 - 6mm for
the knuckle of the plastic hinge used on the outer door.
Adjust if needed. Remove the servo cover and file a small
notch in it to match the knuckle and hinge pin of the plastic
hinge. Notch both corners of the gear door (photo P33),
either side of the plastic hinge, so that the door can open a
little more than 90 degrees without the door touching the
servo cover plate.
Prepare the end of the outer gear door and the inside sur-
face of the servo cover where the hinge will be glued care-
fully. Rough up both surfaces of both sides of the plastic
hinge with 60 grit sandpaper, and then glue the hinge onto
the inside surface of the servo cover using 30 minute epoxy
and milled fibre mix. You will also need to sand a small notch
in the top of the plywood rib outboard of the retract unit so
that the servo cover fits flush again, because of the thick-
ness of the hinge and glue (photo P34).
Reinstall the servo cover, retract, oleo and wheel. Check the
fit of the outer door, and when satisfied sand and clean the
area where the hinge will be glued on to it. With the landing
gear in the retracted position, tack glue the hinge onto the
door with 1 drop of thick/slow CA, and adjust position so that
is parallel with the sides of the opening before it cures. Open
the door and ' trap' the hinge in place properly with more 30
min. epoxy and milled fibre.
There are many proprietary door fixing attachments and
methods, and our optional landing gear set includes
machined aluminium collars that clamp to the leg for secur-
ing the outer door. An simple alternative is to use a piece of
Ø 1.0mm steel wire bent into a 'hoop' shape, and a short length of brass tube glued to the outer
door, as supplied in the hardware pack. (photo above). Adjust the lengths of the sides of the link-
age hoop for correct door closing when the gear is retracted. When the final position and length
of the wire hoop has been determined, file a very small slot (1mm wide and deep) in the inside
surface of the oleo that the wire hoop sits in, and retain it with a 'x' shaped wrap of stainless steel
tying wire or very small cable-ties.
(above) Hinge glued to outer
door and servo cover.
(below) A simple outer door con-
nection - parts included in kit.
(above) Machined aluminium col-
lars for outer door connection -
included in LG option pack.
(below) Servo cover is fixed to ply
tabs under wing skin with 8 sheet-
metal screws (2.2 Ø x 10mm)
21