dust mask when filing/sanding composites) to smooth out the top and bottom faces.
Grinding to a uniform thickness will aid when fitting the steelpipe.
When you assemble the pipe the use of a flat surface and a bubble level will aid setting
the pipe at 90 degrees to the bellmouth.
The steel pipe is pre drilled with four mounting holes, once you have the pipe set
correctly, drill through the carbon with an M3 drill and fix with the provided M3 screws,
washers and nuts.
Before you insert the tailpipe in the glass fibre tailcone, the mould joint tape should be
cleaned up to produce a uniform thickness over the last 15mm. The outer alloy tube is a
snug fit in the tailcone as this acts as the rear fixing. Once the pipe installation is
complete the fibreglass tailcone can be trimmed slightly to match the outer alloy tube.
The tailcone should be screwed to the rear fuselage face with self tapping screws.
The front pipe fixing requires screwing the carbon bell mouth to the half moon doubler
glued to the rear of the front former. Before you finally fix the pipe, it is worth
completing the turbine positioning. This ensures you can achieve the recommended
tailcone to tailpipe gap for your chosen turbine. 20-30mm is the usual range.
On larger JetCat turbines the perfect position is achieved with the motor mounting feet
flush with the front of the turbine rails-this requires removing a small amount of the 3mm
vertical former-above (looking through the wing opening) the turbine rails. 5-6mm packing
under the mount is also normal with the JetCat offset mount used on the
80-90-120-140-160 series.
The new fuselage fuel tank should be cleaned with alcohol before assembling. The tank
features a fibreglass baffle plate, so a section of brass tube should be installed in the
clunk line equally spaced across this baffle. Tygon tubing should be used for the clunk line
(not included) 1/8” 3.2mm i/d is the minimum size suitable for turbines used in the Ultra
Flash Evo.
The fuel tank is mounted with the front supported by a composite/wood cross plate
approximately 50mm wide-spanning the fuselage. Care should be taken sanding this to size
and the fuselage surface roughened before finally bonding in place with epoxy and a small
strip of glass cloth. When you position the plate a small amount of movement should be
detected-this allows for the fuel tank expansion during filling. The rear of the tank is
supported with a Velcro strap. For High G flying a foam support is provided to fit between
the tank and wing top skin. Scrap material should be used to stop the tank moving
forwards and backwards.
Skilled builders will produce various installations depending on equipment used.
Operation of the three retract units may require the positive-negative swapping by turning
over the plug to get all three units working together.
Balance point, gear down 225-235mm back from the wing/fuselage joint line with a little
fuel in the fuel tank.
Control Movements
