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Thrust Tube Assembly and Turbine Installation
The thrust tube is manufactured as a stainless steel inner pipe rolled and spot welded for you at
the factory. At the tail end of the pipe there is an outer aluminium augmenter designed to help draw
cool air through the fuselage and over the pipe as well as
to give a scale appearance.
This tube is designed to work with the sizes of turbine
intended for the BAE Hawk. Turbines in the 180 to 200N
thrust class are perfect.
The first job is to fix the carbon bellmouth to the stainless
inner tube. The bellmouth is designed to go inside the
tail pipe and be fixed by M3 cap head screws or pop
rivets if available to you.
The Hawk was designed without full ducting and the
numerous examples in existence built as the original
Skygate models have used this system perfectly. It has
been found howver that it is a good idea to trim the bottom
of the bypass as shown as it benefits thrust output
particularly when using turbines at the lower end of the
scale.
Start by locating the 2 ply pieces which are CNC cut to fit
in the bypass as shown. These can be fixed in place with
epoxy.
In this example we fitted the thrust tube to the bypass
before trimming the bypass but trimming can be carried
out at any stage.
The pipe is made to fit securely over the bypass. The best
way to join the two pieces is to bring them together and
then rotate one or the other so the pipe slides over and on
to the bypass. Slide it up to the point it can go no further
where the diameter of the bypass diverges to form the
bellmouth. It must cover the bellmouth by at least 12mm.
8
Skygate Collection
BAE Hawk Mk 66
Fig. 1
Fig. 2
Fig. 3
Fig. 4
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