§ Fan and Thrust Duct Installation
Viper Jet MKII Composite
37
as possible and that the notches engage the
inlet ducts, this will guarantee the geometry of
the fan and the thrust duct are correct.
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Tape the thrust duct to the fan with packing
tape. Place tape as far around the sides as
possible.
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Once the thrust duct has been partially attached
you can slide the fan unit slightly backward and
rotate it in both directions to complete taping
the bottom side of the thrust duct. It is
important to get a tight seal all the way around
the fan unit to avoid air leakage and optimize
thrust.
Rotate fan and thrust duct to tape all the way
around
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After the thrust duct has been taped turn the
fan unit and thrust duct back to where the
motor wires point straight up (towards the
bottom of the airplane). Place it in its final
position pushed as far forward as possible and
with the notches in the fan unit engaged with
the inlet ducts.
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Tighten the zip ties around the fan unit by hand
until they are snug.
Don’t over-tighten the zip
ties as this may deform the fan housing,
potentially causing the fan blades to rub against
it.
Remember, the thrust is transferred directly
from the fan to the inlet ducts. The zip ties only
hold the fan in place; they don’t take any of the
thrust.
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Push the forward zip-tie as far forward as it will
go and push the rear zip-tie as far back as it will
go. Trim the excess from the zip-ties and rotate
them out of the way.
Fan and thrust duct assembly completed
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Use scissors to trim the end of the thrust duct to
match the contour of the fuselage tail.
Trim the thrust duct to the edge of the fuselage