Carf-Models Composite-ARF Yak-55 SP Instruction Manual page 19

Composite-ARF Yak-55 SP (2.6m span)
Canopy Frame and Canopy
The canopy frame fits the fuselage already. It is important
to finish the mounts step by step as advised below. The
parts shown in the photo here are from the prototype, and
production versions may look slightly different.
Mill 6 slots (3mm wide x 20mm long) in the canopy frame in
the positions shown, with the outside edge of the slots
approx. 3 - 4 mm inside the outer edge. Then tape the
canopy frame to the fuselage in the correct position, and
mark through all 6 slots onto the fuselage with a felt pen.
Take off the canopy frame and mill the 4 front and back
only in the fuselage, making them about 4.5mm wide
(1.5mm wider towards the centre of the fuselage).
Then mill the 2 middle slots in the fuselage also, but only
3mm wide, so that the 20mm square plywood parts are a
sliding fit in the slots.
Now glue 4 of the 20mm square milled plywood pieces to
the inside of the fuselage directly below the front and back
4 slots, making sure that the inner faces are exactly verti-
cal. Because of the shape of the fuselage you will need to
thicken the epoxy (30 minute type with some milled fibre
and microballoons), especially for the front mounts. Make
sure that these are properly glued in place and that the
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(above) tape off about 5mm (1/4")
around grilles and sand to ensure a
good glue bond.
Finished in 3 hours
(above) Milled plywood parts for
the canopy frame fixing.
(below) One of the finished rear
mounting tongues in place.
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