APC EP Zero ARF User Manual download pdf (Page 14)

At this stage the model should be in ready-to-fly condition

with all of the systems in place.

❏ 1. Use a felt-tip pen or 1/8" [3 mm]-wide tape to accurately

mark the C.G. on the top of the wing on both sides of the

fuselage. The C.G. is located 3-1/4" [83 mm] back from the

leading edge of the wing.

❏ 2.With the wing attached to the fuselage and all parts of

the model installed (ready to fly), 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 weight

must be added to the nose to balance.If the nose drops, the

model is “nose heavy” and weight must be added to the tail

to balance.If additional weight is required, use Great Planes

(GPMQ4485) “stick-on” lead. A good place to add stick-on

nose weight is to the bottom of the fuse at the nose (don’t

attach weight to the battery box–it is not intended to support

weight). Begin by placing incrementally increasing amounts

of weight on the bottom of the fuse under the nose 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 in the same manner.

❏ 4. IMPORTANT: If you found it necessary to add any

weight, recheck the C.G.after the weight has been installed.

❏ 1.With the wing level, have an assistant help you lift the

model by the motor 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.

Balance the Model Laterally

3-1/4" [83 mm]

This is where your model should balance for the first

flights. Later, you may wish to experiment by shifting the

C.G. up to 1/4" [6.4 mm] forward or 3/4" [19 mm] back to

change the flying characteristics. Moving the C.G. forward

may improve the smoothness and stability, but the model

may then require more speed for takeoff and be more

difficult to slow for landing. Moving the C.G. aft makes the

model more maneuverable, but could also cause it to

become too difficult to control. In any case, start at the

recommended balance point and do not at any time

balance the model outside the specified range.

More than any other factor, the C.G. (balance point) can

have the greatest effect on how a model flies, and may

determine whether or not your first flight will be

successful. If you value this model and wish to enjoy it for

many flights, DO NOT OVERLOOK THIS IMPORTANT

PROCEDURE. A model that is not properly balanced will

be unstable and possibly unflyable.

Balance the Model (C.G.)

IMPORTANT: The EP Zero ARF has been extensively

flown and tested to arrive at the throws at which it flies

best. Flying your model at these throws will provide you

with the greatest chance for successful first flights.If, after

you have become accustomed to the way the EP Zero

ARF flies, you would like to change the throws to suit your

taste, that is fine. However, too much control throw could

make the model difficult to control, so remember, “More is

not always better.”

These are the recommended control surface throws:

High Rate/3D Rate Low Rate/Sport Rate

ELEVATOR: 3-1/2" [89 mm] up 1-1/2" [38 mm] up

3-1/2" [89 mm] down 1-1/2" [38 mm] down

RUDDER: 3-1/2" [89 mm] right 2" [51 mm] right

3-1/2" [89 mm] left 2" [51 mm] left

AILERONS: 3" [76 mm] up 1-5/8" [41 mm] up

3" [76 mm] down 1-5/8" [41 mm] down

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 20

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APC EP Zero ARF User Manual Page 14

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