GREAT PLANES Riot 3D Instruction Manual - Page 15

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1. Use a felt-tip pen or 1/8" [3.2mm]-wide tape to accurately

mark the C.G. on the bottom of the top wing near each wing

tip. The C.G. is located 2-5/16" [58mm] back from the

leading edge of the top wing.

This is where your model should balance for the first

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

C.G. up to 0.4" [10mm] forward or 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 make it 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.

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2. With all parts of the model installed (ready to fly) and

battery installed, lift the model right-side up at the balance

point you marked.

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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. Use Great Planes

(GPMQ4485) "stick-on" lead to add additional weight to the

Riot 3D ARF if needed. A good place to add stick-on nose

weight is to the bottom of the fuselage under the firewall. 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. DO NOT attach tail weight to the stab, as

it is not intended to support additional weight.

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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

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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.

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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 18 of this manual 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

flying with batteries that are only partially charged.