Hobbico Flitework Extra 300LP FLWA4003 Building And Instruction Manual Download Page 13

Page: 13 / 16

At this stage the model should be in ready-to-fly condition
with all of the systems in place including the engine, landing
gear, covering and the radio system.

❏

1. Use a felt-tip pen or 1/8"-wide tape to accurately mark

the C.G. on the top of the wing. The C.G. is located 4-7/8"
[124mm] back from the leading edge of the wing.

❏

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 upside-down on a Great Planes CG Machine, or lift
it upside-down at the balance point you marked.

❏

3. If the tail drops, the model is “tail heavy” and the battery

pack and/or receiver must be shifted forward or weight must
be added to the nose to balance. If the nose drops, the model
is “nose heavy” and the battery pack and/or receiver must be
shifted aft or weight must be added to the tail to balance. If
possible, relocate the battery pack and receiver to minimize or
eliminate any additional ballast required. If additional weight is
required, nose weight may be easily added by using a “spinner
weight” (GPMQ4645 for the 1 oz. weight, or GPMQ4646 for the
2 oz. weight). If spinner weight is not practical or is not enough,
use Great Planes (GPMQ4485) “stick-on” lead. A good place to
add stick-on nose weight is to the firewall (don't attach weight
to the cowl–it is not intended to support weight). Begin by
placing incrementally increasing amounts of weight on the
bottom of the fuse over the firewall until the model balances.
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:

Do not rely upon the adhesive on the back of the

lead weight to permanently hold it in place. Over time, fuel
and exhaust residue may soften the adhesive and cause the
weight to fall off. Use #2 sheet metal screws, RTV silicone or
epoxy to permanently hold the weight in place.

❏

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.

SET THE CONTROL THROWS

Use a ruler to accurately measure and set the control throw of
each control surface as indicated in the chart that follows. If
your radio does not have dual rates, we recommend setting
the throws at the low rate settings.NOTE: The throws are mea-
sured at the widest part of the elevators, rudder and ailerons.

We recommend the following control surface throws:

Elevator

3D Control Throws

Low rate

40°

Expo 45%

40°

Expo 45%

Down

20°

Expo 25%

20°