FUTABA FP-8SSHP Instruction Manual page 31

• Set the [C] inverted flight FS switch on the trimmer
panel at the back of the set to the INVERT position.
• At this time, pitch control servo, elevator servo, and
rudder servo forward < - > reverse switching can be
performed with the [26] switch and normal <-> invert-
ed flight switching can be performed.
• When the [26] switch is pulled (inverted flight func-
tion ON) when the [3] throttle lever is in the neutral
(center) position, the neutral position of the pitch
control servo moves to the plus side (pitch HIGH
side at the rear panel).
• When connecting the linkage with the inverted flight
specifications, always set the [C] switch to the
INVERT position.
• Then adjust the set so that normal flight is normal.
• Perform normal flight and adjust the pitch.
• After adjustment, switch from normal flight to
inverted flight.
There are various methods of changing from normal
flight to inverted flight. One method is to enter
inverted flight by making a half roll from straight
flight.
* First, make a half roll from straight horizontal
flight at an altitude of about 30m and when the
helicopter is exactly on its back, turn on the in-
verted flight function by pulling the
back.
* If the throttle lever remain high at this time, the
posture of the helicopter will change suddenly.
Shifting to inverted flight can be performed
smoothly by lowering the throttle lever to about
medium slow.
* Learn the [26] switch switching timing, throttle
lever operating setting, etc. by practicing normal
flight <-> inverted flight switching repeatedly.
• Next, switch from inverted straight flight to inverted
hovering.
* Lower the altitude by slowly lowering the throttle
lever.
INVERTED FLIGHT PREPARATIONS
FLIGHT
[26] switch
• After adjusting normal flight, adjust inverted flight.
* Before flight, set the [26] switch to the back posi-
tion (inverted flight function ON) and set the
throttle lever to maximum slow, then set the mini-
mum pitch at inverted flight with the [A] trimmer.
* Next, set the throttle lever to maximum high and
set the maximum pitch at inverted flight with the
[B] trimmer.
* The [A] and [B] trimmers can be adjusted only
when the [26] switch is in the back (inverted flight
function ON) position.
* Since the [6] hovering pitch lever and [13] pitch
control high side trimmer lever control the pitch
control servo even at inverted flight, they can be
adjusted to the optimum pitch.
* At this time, when the helicopter descends slug-
gishly and the main rotor speed drops even when
the throttle lever is lowered, return to normal
flight, then land and lower the lowest pitch of
the main rotor at inverted flight with the [A] trim-
mer.
* Set the [6] hovering pitch lever, etc. so that the
main rotor speed at inverted hovering and normal
hovering is about the same.
* If the difference it too large, readjust the linkage.
Finally, check the high side pitch.
* Try setting the throttle lever to maximum high at
inverted hovering.
* If the main rotor speed drops at this time, lower
the high side pitch with the [13] pitch control high
side trim lever, then land and correct the [13] lever
portion with the [B] trimmer.
(Correct with the [B]
lever position is the same at normal flight and in-
verted flight.)
trimmer so that the [13]
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