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Jabiru J450 Constructors Manual
Pre-Paint>Fuselage>Fit ventral fin and trim horn
Tuesday, April 6, 2010
23 of 343
Pre-Paint>Fuselage>Fit ventral fin and trim horn
Objectives of this task:
To fit the ventral fin, trim horn and cut the related rear fuselage penetrations. This task is
carried out while the fuselage is inverted and supported on trestles.
Materials required:
Epoxy resin and flock, 5-minute Araldite
Hardware box #4
Cut the cable and tube slots
The cable and tube slots are marked on the underside of the fuselage with marker pen.
Cut out the marked slots on the fuselage centreline. Each slot should be drilled at each end to
about ½” and then the holes can be joined by cutting along the lines with a jigsaw.
We find that widening the elevator cable slot (the slot at the very rear of the fuselage) as
shown in the photo above can provide useful access later in the build.
Do
not
cut out the line marker for the trim horn! The trim horn marking can be transferred
through the peel cloth by scribing around the marks with a sharp knife, cutting just deep
enough that the cut can be seen once the peel cloth has been removed.
File and sand all cutouts to a good finish. Remove the peel cloth from the ventral fin area (rear
underside) of the fuselage.
Check the elevator cable mounting holes: test fit the horizontal stabiliser to the fuselage and
push it all the way forward. Hold a set square against the rear of the horizontal stabiliser and
along the fuselage and measure
exactly
150mm forward from the rear of the
stabiliser
(and
not
the fuselage) as shown in cyan in the photo above – the 2 holes should be on that line.
If they are not, fill the existing holes with flock and redrill them so that they are exactly
150mm from the rear of the stabiliser. This dimension will become critical later when you
adjust the elevator travel so take the opportunity to check it (and adjust it if needed) now.
Remove the horizontal stabiliser and store carefully until required.
150mm
Trim horn
DO
NOT
CUT OUT!
Elevator cable
mounting bolts
Completed ventral fin area showing slots, trim horn and ventral fin retaining nuts