Flyzone HCAA42 - Manual (Page 12)

12
Check the C.G. (Center of Gravity)
The C.G. (Center of Gravity) is the location on the wings,
measured back from the leading edge on both sides of
the fuselage, where the model balances. In addition to the
control surface throws, the C.G. has a GREAT effect on the
way the model fl ies. If the C.G. is too far aft (tail heavy), the
model will be too responsive and diffi cult to control. If the
C.G. is too far forward (nose-heavy), the model will be too
stable and not responsive enough. Follow the instructions
to make sure the model is balanced properly and the C.G.
is in the correct location.
❏
1. Install the motor battery (do not connect the wires) and
battery hatch. All the rest of the parts of the model should
already be in place including the propeller and spinner
and the wing struts (it is not necessary to have the clip-on
antennas in place as they will have no measurable effect on
the C.G.).
❏
2. You have already marked the balance points on the
bottom of the wings. Now place your fi ngers on the middle
balance marks and lift the model. The fuselage should remain
level—it may be helpful to have an assistant view the model
from the side (or have your assistant lift the model) to see if
it is level. If the tail drops, nose weight will be required. If the
nose drops the tail weight will be required. The best way to
fi nd out how much weight is required to balance the model
is to place segments of stick-on lead weight on the fuselage
wherever it may be needed. For this, Great Planes stick-on
lead weight (GPMQ4485) (or similar) should be used.
❏
3. Determine the amount of weight required by placing
segments over the cowl or tail where shown, but do not
attach the lead yet.
❏
4. Once you can get the model to balance and you know
how much lead will be required, permanently stick it into
position. If nose weight is required, you could simply stick it to
the bottom of the fuselage just behind the nose landing gear.
If you prefer the lead to be concealed, remove the spinner
cone, propeller and spinner back plate. Use a sharp hobby
knife to slice through the decals and pull the cowl off the
fuselage. Place nose weight under the motor where shown.
Replace the cowl and hold it into position with clear tape.
Replace the spinner and propeller.