E-flite Apprentice S 15e RTF with SAFE User Manual download pdf (Page 12)

Before the ﬁrst ﬂights, or in the event of an accident, make sure the control

surfaces (Rudder, Elevator and Ailerons) are centered (aligned) with the rest of

the surface. If the control surfaces are not centered, centering can be achieved

by following the steps below:

• Pullthetubefromtheclevistothelinkage.

• Carefullyspreadtheclevis,theninserttheclevispin

into the correct hole in the control horn.

• Movethetubetoholdtheclevisonthecontrolhorn.

IMPORTANT: SAFE Technology is not active until you advance the throttle

past 25%. All trimming and control direction test should be done before SAFE

technology is activated.

Control Horn and Servo Arm Settings

Elevator Ailerons Rudder

ArmsHorns

Nose Gear

Rudder

NOTICE: Moving a linkage to another position may block the servo arm or

affect SAFE technology functionality.

The Illustration shows the correct hole settings in servo arms and control horns.

Dual Rate High Rate Low Rate

Aileron 23.0mm (0.91 in) 18mm (0.71 in)

Elevator 23.0mm (0.91 in) 18mm (0.71 in)

Rudder 35mm (1.35 in) 28mm (1.10 in)

Recommended Rates

Use low rates for decreased control throws in all ﬂight modes

Use high rates for increased control throws in all ﬂight modes

An aircraft with a correct CG has its weight balanced at a calculated point

where the entire airframe will balance when suspended at that point.

After installing the battery (in the recommended position) and before

powering on the ESC switch, verify the CG by supporting the aircraft 79.0mm

(approximately 3.125 inches) back from the front edge of the wing, as shown.

Tip: Balance the aircraft on your ﬁngertips near the fuselage under the wings.

• If the nose goes down, move the ﬂight battery back

until the aircraft balances.

• If the nose goes up, move the ﬂight battery forward

until the aircraft balances.

When ﬂying with correct CG in beginner mode, the aircraft should climb

gradually at full power and ﬂy level at 50%–60% power with no elevator input.

If the aircraft CG is too far forward (nose heavy), up elevator is required to ﬂy

level at 50%–60% power. If the aircraft CG is too far aft (tail heavy), down

elevator is required to ﬂy level.

Adjust the battery position as needed.

Center of Gravity (CG) Veriﬁcation

79.0mm

3.125 inches back from the

leading edge of the wing.

Control Surface Centering and Clevis Installation on a Control Horn

Turn the clevis on the linkage to change the length of the linkage between

the servo arm and the control horn.

TIP

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E-flite Apprentice S 15e RTF with SAFE User Manual Page 12

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