38
❏
2. With the wing attached to the fuselage, all parts of the
model installed (ready to fly) and an empty fuel tank, place
the model on a Great Planes CG Machine, or lift it at the
balance point you marked.
❏
3. If the tail drops, the model is “tail heavy.” If the nose
drops, the model is “nose heavy.” Use Great Planes “stick-on”
lead (GPMQ4485) to balance the model. To find out how
much weight is required, place incrementally increasing
amounts of weight on the bottom of the fuselage over the
location where it would be mounted inside until the model
balances. A good place to add stick-on nose weight is to the
firewall. Do not attach weight to the cowl—this will cause
the mounting screws to open up the holes in the cowl. Once
you have determined the amount of weight required, it can
be permanently attached. If required, tail weight may be
added by cutting open the bottom of the fuse and gluing it
permanently inside.
Note:
If mounting weight where it may be exposed to fuel
or exhaust, do not rely upon the adhesive on the back to
permanently hold it in place. Over time, fuel and exhaust
residue may soften the adhesive and cause the weight to
fall off. Instead, permanently attach the weight with glue or
screws.
❏
4.
IMPORTANT:
If you found it necessary to add any
weight, recheck the C.G. after the weight has been installed.
Balance the Model Laterally
❏
1. With the wing level, have an assistant help you lift the
model by the engine propeller shaft and the bottom of the
fuse under the TE of the fin. Do this several times.
❏
2. If one wing always drops when you lift the model, it
means that side is heavy. Balance the airplane by adding
weight to the other wing tip.
An airplane that has been
laterally balanced will track better in loops and other
maneuvers.
PREFLIGHT
Identify Your Model
No matter if you fly at an AMA sanctioned R/C club site or if
you fly somewhere on your own, you should always have your
name, address, telephone number and AMA number on or
inside your model. It is
required
at all AMA R/C club flying sites
and AMA sanctioned flying events. Fill out the identification tag
on page 42 and place it on or inside your model.
Charge the Batteries
Follow the battery charging instructions that came with your
radio control system to charge the batteries. You should
always charge your transmitter and receiver batteries the night
before you go flying, and at other times as recommended by
the radio manufacturer.
CAUTION:
Unless the instructions that came with your
radio system state differently, the
initial
charge on
new
transmitter and receiver batteries should be done for 15
hours
using the slow-charger that came with the radio
system
. This will “condition” the batteries so that the next
charge may be done using the fast-charger of your choice.
If the initial charge is done with a fast-charger the batteries
may not reach their full capacity and you may be fl ying with
batteries that are only partially charged.
Balance Propellers
Carefully balance your propeller and spare propellers before
you fly. An unbalanced prop can be the single most significant
cause of vibration that can damage your model. Not only
will engine mounting screws and bolts loosen, possibly with
disastrous effect, but vibration may also damage your radio
receiver and battery. Vibration can also cause your fuel to
foam, which will, in turn, cause your engine to run hot or quit.
We use a Great Planes Precision Magnetic Prop Balancer
™
(TOPQ5700) in the workshop and keep a Great Planes
Fingertip Prop Balancer (GPMQ5000) in our flight box.
Ground Check and Range Check
Run the engine for a few minutes to make sure it idles reliably,
transitions smoothly and maintains full power indefinitely.
Afterward, shut the engine off and inspect the model closely,
making sure all fasteners, pushrods and connections have
remained tight and the hinges are secure. Always ground
check the operational range of your radio before the first flight
of the day following the manufacturer’s instructions that came
with your radio. This should be done once with the engine off
and once with the engine running at various speeds. If the
control surfaces do not respond correctly,
do not fly!
Find and
correct the problem first. Look for loose servo connections or
broken wires, corroded wires on old servo connectors, poor
solder joints in your battery pack or a defective cell, or a
damaged receiver crystal from a previous crash.
Содержание Citabria
Страница 42: ...42 This model belongs to Name Address City State Zip Phone Number AMA Number ...
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