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Door Cylinder and Valve Installation
The CARF Pneumatic Completion kit
consists of 2 pcs 2-way valves for retracts
and gear doors and 1 pc 1-way valve for
wheel brakes. As the speed brake is such a
highly recommended accessory, we
describe the valve installation of the speed
brake pneumatic kit in this manual as well.
So, a total of 4 electronic valves will have
to be installed.
As the photo shows, the valves should be
placed beside the nose gear.
All pneumatic plumbing is very straight
forward and does not need much
description, follow the instructions in the
valve packs of the manufacturer to connect
and to program.
Note: In order to avoid a "gear door crash"
between front and rear gear door it is
mandatory to connect the rear gear doors
into the main retract loop and have the
front main gear door, together with the
nose gear door, put on a time delayed
separate circuit. Either use separate
channels and a gear door sequencer or
program the switch points of the two
valves apart from each other and set a
slow function on the gear channel.
If you experience that the gear retracts too
slowly for your flying style, you can add
one separately purchased electronic 2-way
valve parallel to the first retract valve. This
will double the air put through the system,
increasing speed and momentum of the
retraction cycle.
Install the air bottle into the nose of the
plane. It is recommended to somehow fix
it in the fuselage, even though it will stick
out of the fuselage, so that the nose cone
can be removed without having to
disconnect airlines. Install the batteries in
the very front part of the fuselage, too.
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