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Tail Pipe
The tail pipe supplied is very long requiring
assembly inside the fuselage shell. (Photos 23
and 24)
The tail pipe can be assembled to the carbon
bell-mouth with four sheet metal screws or four
M3 Allen screws if you prefer. Drill the tail pipe
in four places around 5mm in from the front
end. Push the carbon bell-mouth fully home and
check for squareness. Drill through the carbon
and test fit the screws. (Photo 25)
Tip mark the position with a coloured pen so
that the same position can easily be found when
reassembling inside the fuselage. The tail pipe
needs to slide forward before being levelled and
pushed back. This should be done before the
front installation plate is complete.
The rear former features notches to allow the
double skinned tube assembly screws to clear as
they are passed through.
The turbine carbon housing is critical to the
tail pipe mounting and should be installed
as designed. The lower section is bolted to
the carbon bell mouth with three M3 Allen
screws, before being fixed to the motor rails
and clamped under the turbine mount. The top
section features a double skin to lock into the
bell mouth cone. Some time removing the sharp
edges from both the bell-mouth and top cover
plate key slot will allow easier installation in
the fuselage. Radius the turbine mounting rails
where the ducting fits to allow the mounting
ears to seat properly. (Photo 26)
Before marking and drilling the three mounting
holes for the bell-mouth and lower turbine duct
note where the tail pipe seam runs and orientate
the tube so that the seam will run along the
top of the fuselage, this gives a better look on
the ground. Hold the lower half turbine duct
in position and mark the split line on the bell-
mouth. This is the highest line and the three
mounting screw holes need to be below these
Composite ARF Tutor T-114 manual – techsupport@composite-arf.com
lines. Mark the chosen position and drill three
holes. Note the lip width on the duct and drill
the holes half way across this.
Clamp the duct to the bell-mouth and drill the
centre hole only. It is critical that the duct to tail
pipe alignment is correct and the remaining two
holes should be marked with the tail pipe and
duct installed.
Slide the tailpipe into position and fix the
carbon bell-mouth to it. Bolt the centre fixing
screw to the bell-mouth/duct and slide the tail
pipe into position. The outer wall should be
flush with the rear fuselage.
Use the turbine or temporarily fix the duct to
the turbine rails, ensure the duct lower section is
pulled out to the rail width.
With everything in position use a sharp scribe or
sharp pencil to mark to two remaining holes on
the bell-mouth. Remove the assembly and drill
the two remaining mounting holes.
Reassemble the tailpipe assembly and prepare
the turbine with its mount. On a JetCat turbine
the mounting lugs are facing forwards. Place the
turbine in position and ensure the distance from
the rear of the turbine tail cone to the start of the
stainless inner tail pipe tube is 25-30mm. Centre
the turbine left to right and drill two diagonal
mounting holes, 4mm diameter. Install screws
and check the turbine position looking up the
tail pipe and from the front. At this time just the
left right position is critical. When happy drill
the remaining two holes. Open the holes to 5mm
and install M4 T nuts.
Bolt the turbine in position and sight the turbine
position looking up the tail pipe-a torch helps
here. Small angular changes can be achieved
by bending the mount slightly. Other makes
of turbine than JetCat may require packing.
(Photo 27)
With the turbine in position trim and clip the
duct top cover in position, mark the position
25
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