Jabiru J450 Constructors Manual
Pre-Paint>Fuselage>Fit cowling
Tuesday, April 6, 2010
110 of 343
Fit the bottom cowl to the fuselage
Offer the bottom cowl up to the top cowl – a well padded saw stool can be used to hold the
cowl up – and fit the locating section at the front of both cowls to position the bottom cowl.
Butt the joins together and
tape the bottom cowl to the
top cowl.
Using the same technique
that you used on the top
cowl, use masking tape to
mark the cowl to the correct
length then remove the
bottom cowl and cut along
the front of the masking
tape. Sand all cut surfaces
with a long sanding block.
Refit the bottom cowl and
tape into place, then mark
and drill 5 x 3/32” holes on each side, each 10mm in from the edge of the cowling and each at
60mm away from each bend plus one screw near the bottom of the cowl – the lines in the
photo above show the positions.
Temporarily fix the bottom cowling to the fuselage with 6G stainless steel screws.
Trim and finish the ram air ducts
Remove the top cowl and mark the front of the ram air ducts 10mm back from the inside of
the bottom cowl as shown above left.
Remove the ram air ducts and trim to the mark, sanding away all rough edges.
Mix up a small batch of 5-minute Araldite and flock and bond the rubber sealing strips around
the front of each ram air duct as shown above right, holding the strips in place at 12mm in
front of the ram air duct with spring clips while the flock dries.
Remove the bottom cowl and take both cowls to a cleared workbench.
Cowl
3mm ram air
duct spacer
10mm
12mm