§ Main Gear, Retractable (Optional)
Viper Jet MKII Composite
15
Mount Gear and Connect Air Lines
Required Parts
o
o
o
o
Wing [W]
o
o
o
o
Main Retractable Landing Gear Units (2)
o
o
o
o
Retract Unit Mounting Screws (8)
o
o
o
o
Retract Unit PVC Covers (2) [W1]
o
o
o
o
Air Line
Required Tools and Adhesives
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®
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Thin CA Adhesive
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®
®
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Screwdriver
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Air Line Cutting Tool
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Refer to the manual included with the Rz180
retracts for details on the correct installation and
plumbing of the retract units. Although a good
overview of the process is provided here more
details can be found in that manual.
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Laser etched pilot holes are provided on the
plywood retract unit mounts. Reinforce these
holes and the mounts using a couple of drops of
thin CA adhesive.
Reinforce retract mounting holes
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Ensure you use screws long enough to go
through the entire gear mount but not so long
they go through the wing’s top balsa sheathing;
10mm - 12mm are recommended. Don’t be
tempted to use the screws provided to affix the
fixed gear covers since they are not long
enough to go through the entire mount and
could result in the retract units breaking loose
during takeoff or landing.
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Cut two air lines to sit inside the wing and into
the fuselage. Attach them to the retract units.
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Tip: cut the internal air lines a little long; you
can always trim them when you are ready to
attach them to the T-Fitting in the fuselage.
Attach air lines to retract unit
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Mount the retract units to the plywood hard
points. Don’t over-tighten the screws as this
may lead to binding in the retract unit.
Retractable landing gear unit mounted in final
position
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Route the two air lines through the wing
through the supplied channels to keep them out
of the way of the retracted gear.
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Bond the PVC covers to the wing over the
retract units using CA adhesive. This will reduce
the size of the opening and provide a smoother
and neater installation.
PVC retract unit covers
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This is a good time to test the retract units; you
can do this by temporarily attaching your retract
pump to the retract unit airline.