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Exact positioning of the RC gear will depend on size and weight of batteries, receiver,
speed controller, etc.
The fan unit is wrapped around the rear with 24-25mm (1 inch) wide masking tape
until it is a snug fit in F9 when inserted from the front. It then needs to be positioned
so that the rear of the fan shroud is exactly 18mm behind the rear of F9. This applies
to all makes of fan. The shroud outer diameter becomes about 55.5mm after the
tape. The tailpipe overlaps 6mm forward from the rear of the fan shroud.
Once in position, the 18mm of fan shroud that protrudes is wrapped with a couple of
additional layers of masking tape to form a lip that prevents the fan from moving
forward under thrust. The fan is now secured to F9 by cyano or silicon adhesive, and
can easily be removed if necessary by cutting the glue away from the tape.
The pictures below show how three different fans fit into the F9 assembly:
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