Nosegear Door - Carf-Models Ultra Flash Instruction Manual

bolts to hold it in position. Then drill the other 3 holes, also
inserting a bolt to keep the correct alignment after each
hole is drilled. Remove the retract unit and open up all the
holes to Ø5.5mm for the M4 T-nuts.
Using one M4 bolt and a large washer, pull the spikes of
each T-nut into the top surface of the mounting rails just a
little, with a drop of 30 minute epoxy on each. Then re-
install the retract unit and tighten all four M4 x 16 bolts
tightly, which will make sure that the T-nuts are perfectly
aligned when the glue has cured.
Check that the steering arms clear the bottom edge of the
bulkhead F2 when the gear is operated by hand. Sand F2
until there is at least 2mm clearance. We have provided
1.5mm thick milled plywood packers for all the retract
units, and if needed you can add these under the retract
unit to raise it off the mounting rails a little.
To keep the trailing-link nose oleo centered, and stop it
rotating in the retracted position which could prevent it
coming down, there is a plywood 'U' shape milled in the
bulkhead above the 'knuckle' of the oleo leg. Cut a length
of the 12mm wide thin fibreglass strip, gently bend it in to a
'U' shape, and glue into the plywood with CA as shown.
Fit your nosegear steering servo into the factory-installed
plywood mount using the Ø 2.9 x 13mm sheetmetal
screws provided. Make up the steering cables, passing
them through the holes in the plywood either side of the
noseleg centering 'U' shape bulkhead. For extra security,
thread the cables through the crimping tubes 2 times as
shown below. Connect the cables to the servo arm using
the threaded connectors and M3 steel clevises. When the
cables have been finally adjusted, use 2 short lengths of
the supplied heatshrink tube over each connector to make
sure that the cables can't kink and prevent the gear
extending (see photo P12).
The steering cables must be prevented from fouling the
nosegear when it is retracted. Here we show a simple
method, using a couple of rubber bands to pull them
upwards, attached with small hooks made from paperclips
and glued under scrap balsa blocks to the cockpit siderails.
Works perfectly every time!

Nosegear Door

Included in the kit is a moulded and painted nosegear
door, which is hinged at the front with a flat plastic hinge,
and pushed open by the noseleg oleo itself. Air pressure
keeps it closed during flight. No air cylinders or complex
(below) Sand Bulkhead F2 for
steering arm clearance if needed.
(above/below) Noseleg is centred
with 'U-shape' fibreglass strip
above the oleo knuckle.
(below) 2 small rubber bands
keep steering cables tight, and
prevent fouling when retracted.
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