3D Hobby Shop Extra SHP 47" Manuel d'assemblage - Page 19

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Balancing: The recommended starting balance (CG) point of the 47" Extra is 3.5 inches behind the

leading edge of the wing measured at the root of the wing, where the wing meets the fuselage.

This is a conservative CG location, excellent for sport flying or precision flight. For 3D flying, you may

wish to move your CG back. If you do so, move it in small increments, a small change can have a large

effect.

An easy way to verify your CG settings during tuning is to do the "roll inverted" test. Trim your plane for

perfect upright hands-off flight. Then, with sufficient altitude, at ¾ throttle, roll inverted and release the

controls. Your airplane should very gently descend. If instead, it climbs, it is far too tail-heavy. If it dives

sharply, it is too nose heavy.

Scott's Tip:

Setting appropriate control throws is a critical step in matching your model to your

flying style. Personally, I use two different flight "modes"– precision and 3D. Depending upon

your radio, you may be able to combine all three dual rate functions onto a single switch, which

is the technique I use. Regardless, be sure to use a common assignment scheme to prevent

being in the wrong rate at the wrong time. I prefer my switches to be higher for high rates and

lower for low rates, but virtually any combination will work – just be comfortable with your

setup.

Low/Precision Rates (in degrees and inches) and Corresponding Exponential

Aileron

Elevator

Rudder

High/3D Rates (in degrees and inches) and Corresponding Exponential

Aileron

Elevator

Rudder

The above throw measurements were taken at the aft edge of the ailerons and elevator,

and from the bottom aft edge of the rudder. Keep in mind that even the low throws mentioned

here are relatively aggressive, so be sure to also program the matching exponential listed to help

soften the model's feel around center stick.

One of the things you may notice is that my low rates are dramatically lower than you

might expect. I find that I have such great control authority that I need to minimize the elevator

in particular or the snap rolls will be far too deep into the stall for clean recoveries. You should

also note that even the high aileron rates are also relatively sedate compared to the extreme 45

degree throws common to 3D models. I set my 3D rate aileron throw for a comfortable roll rate

during the slowest rolling maneuver I fly – the rolling harrier. I prefer to hold full aileron throw

during the rolling harrier, so excess throw results in excess roller rate, which is detrimental to

not only the maneuver's appearance, but also the maneuver's timing.

Control Throws and Exponential

15 degrees

.75"

13 degrees

1.25" 30% Expo

45 degrees

3.5"

28 degrees

1.25" 75% Expo

45 degrees

3.5"

30% Expo

75% Expo

85% Expo

75% Expo