APC EP Zero ARF Instruction Manual download pdf (Page 25)

Balance the Model (C.G.)

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

with all of the systems in place including the motor, prop,

landing gear, radio system, wheel pants, struts, and battery

hatch (canopy).

❏

1. Turn the model over and mark the C.G. location on the

bottom of the wing using a felt-tip pen. The C.G., or balance

point, is located at 2-1/4" [57mm] back from the leading edge

of the wing at the wing root. This is where your plane should

balance and fly for the first few flights. Note: It is permissible

to fly the airplane with the C.G. up to 1/4" [6.4mm] forward or

1/4" [6.4mm] aft of this point. Do not fly outside of the listed

C.G. range!

To ensure a successful first flight, fly your Mr. Mulligan set

up only according to the C.G. and control surface throws

specified in this manual. The throws and C.G. are not

arbitrary, but have been determined through extensive

testing and accurate record-keeping. This provides you

with the best chance for success and enjoyable first flights

that should be surprise-free. Additionally, the throws and

C.G. shown are true, real data which will allow the model to

perform in the manner in which it was intended when flown

by a pilot of the skill level for which it was intended. DO

NOT OVERLOOK THESE IMPORTANT PROCEDURES.

A model that is not properly setup will be dangerous,

unstable, and possibly unflyable.

❏

2. Strap the battery to the battery tray, but do not connect

it. Fit the canopy. Suspend the model upright by placing your

fingers on the marks you made.

❏

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.

[28g] weight, or GPMQ4646 for the 2 oz. [57g] 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 structure around 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. Use #2 sheet-metal

screws 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 wings level, have an assistant help you lift

the model by the 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.

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APC EP Zero ARF Instruction Manual Page 25

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