Tail Cone - Carf-Models Ultra Lightning Instruction Manual

feed tube and the fuel pump and disconnect here to fill, and this has the added advantage that
you cannot accidentally fill the turbine with fuel if the manual shut-off valve has been left open,
or the fuel solenoid valve allows a small amount of fuel to pass thought it. It's your choice.
Use the same method as for the main tanks to assemble the tubes, with either fuel barbs or small
brass tube rings soldered onto them to make sure that there can be no leaks.
Fuelling
Because the 2 main tanks have baffles in them, to prevent fuel surge and Centre of Gravity
changes during aerobatic manoeuvres, it is important to remember to fuel the model until the
excess comes out of the overflow/vent under the model, and then wait for a 10 - 15 seconds
before topping them up again. If not, you may end up taking off without full tanks....
Optional 3rd Tank
Also available (as an option) is a 3rd main tank, moulded
from kevlar, with a maximum capacity of 2.1 litres, which can
be fitted either above or under the ply plate between the
inlets. This can be used to hold extra fuel if you fit a larger
turbine (eg: P200 or Olympus), or could be used to hold
smoker fuel if you wish to fit a smoke system. If used as an
additional fuel tank, it should be connected in series
between the Hopper and the Tees to the main tanks, and it
will be emptied first.
It is supplied in 'kit' form, with all the necessary hardware
(stopper, cap and sleeve), and instructions for joining by
you. The lower half of the tank is flanged for easy joining,
with Hysol 9462 or similar. If fitted above the plywood plate between the inlets you can join it at
the maximum size, but if you choose to fit it below the ply plate you will need to cut down the
height by about 12mm (1/2") to fit it in place - giving a capacity of about 1.7 litres. Remember to
leave enough space above the tank to route all the servo extension leads, air lines and services
to your turbine.

Tail Cone

The pre-painted fibreglass tailcone is retained to the fuselage with 6 of the small 2.2 Ø x
10mm sheetmetal screws, into small plywood squares that need to be glued, equally spaced,
inside the fuselage flange (photo P46). Because of the slight taper on the inside of the tailcone
you might need to chamfer the outside edge of the fibreglass flange on the fuselage a little for
a good fit (see photo P45).
The back edge of the fibreglass tail cone is supplied a little bit long, and should be cut off with a
disc and trimmed back with a flat block and fine sandpaper until it is the same length as the outer
exhaust tube.
(above) The extra fuel tank can be
installed above, or below, the ply-
wood plate between the inlets.
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