JR 8103 Systems
Please refer to the
s c reen at right for the
p roper starting values.
JR XP652 and Other Systems:
Up Mix (RVU): +/- 10%
Down Mix (RVD): +/- 10%
Change the mixing values from + to - to
establish the correct mixing dire c t i o n .
N o t e : It is only necessary to assign tail
rotor mixing values to the flight modes that
the G550T will be used in standard rate
m o d e .
FLIGHT TRIMMING
Tail Rotor Trim Adjustment
On the first test flight, it may be necessary to adjust the trim of the tail ro t o r
mechanically if the model pirouettes slowly in either dire c t i o n .
As with all heading hold type gyros, make any tail trim adjustments in rate mode
by adjusting the tail rotor control rod mechanically.
Do not use sub trim or the transmitter trim to make these fine trim adjustments,
as this will cause an out of trim situation when the tail lock mode is in use.
Adjust the tail trim by lifting the model into a stationary hover, and note the dire c-
tion the mode pirouettes. Land the model, and adjust the tail control rod length as
needed. Continue this pro c e d u re until the heli will remain in a stationary hover, with
the tail remaining straight. Once this adjustment has been made, the G550T can be
re t u rned to tail lock mode if desire d .
N o t e : While in tail lock mode, the G550T will automatically establish the corre c t
neutral position of the tail rotor without the need to re-adjust the linkage.
GAIN ADJUSTMENT
Hover
Lift the heli into a stationary hover, while looking for any side to side movement
(hunting) of the tail rotor (yaw axis). If the model displays a Hunting tendency,
reduce the gain value by 5% and retest. Reduce the gain as needed until the model
will maintain in a stationary hover without hunting.
If the gain value is below 70% in hover, move the control ball in 1 hole on the tail
rotor servo arm and retest. If the gain value reaches 100% and no hunting occurs,
move the control ball out 1 hole on the servo arm and re t e s t .
The ideal gain setting when using a rotor rpm of between 1300 and 1400 rpm is
in the range of 90-95% gain. This will indicate that the control system has been set
to the optimum mechanical settings.
Forward Flight (Stunt)
F rom a hover of at least 15’ high, move the flight mode switch to the stunt posi-
tion, and begin to transition into a very slow forw a rd flight. If hunting occurs, move
the flight mode switch back to the normal position and land the model. Reduce the
gain by 5% and re-test. Continue this pro c e d u re until all hunting is removed with the
model at full forw a rd speed. The final gain value should be in the range of 55-80%.
If the gain value is below 50%, move the control ball in one hole on the tail serv o
a rm and retest. If the gain value is above 80%, move the control ball out one hole on
the tail servo arm and retest. These values are based on a main rotor rpm in the
range of 1650 — 1750 rpm.
PIROUETTE RATE BALANCING
(Experienced pilots only)
Lift the model into a stationary hover. If you are comfortable, perf o rm a full stick
p i rouette to the left, and then to the right while noting the speed in which the model
rotates. If the model rotates more quickly in one direction that the other, adjust the
travel adjust value in your radio program down on the fast side and retest. When
completed, the model should pirouette at an equal rate in both dire c t i o n s .
Tail Rotor Blade Length
In most cases, choosing the correct tail rotor blade length can play a big part in
the overall perf o rmance of a gyro .
As a starting point, a 60-size heli with a 4.93 to 5.18 tail gear ratio perf o rms very
well with a tail rotor blade length of approximatelt. 95 mm. We recommend NHP tail
rotor blades (NOH195) for their superior rigid and overall perf o rm a n c e .
When stopping after a pirouette, if the model displays a “rebounding” motion in
one or both directions, this is generally caused by the tail blade length. Lengthen or
s h o rten the tail blades until this rebounding is removed. Since there are many vari-
ables that can also cause rebounding (rigidity of the helicopter frame and tail boom,
etc), proper adjustment can only be achieved through test flying.
WARRANTY COVERAGE
Your new equipment is warranted to the original purchaser against manufacture r
defects in material and workmanship for 1 year from the date of purchase. During
this period, Horizon Service Center will repair or replace, at our discretion, any com-
ponent that is found to be factory defective, at no cost to the purc h a s e r. This warr a n-
ty is limited to the original purchaser of the unit and is not transferable.
R E PAIR SERVICE INSTRUCTIONS
1 . R e t u rn your system components only. Do not re t u rn your system installed in a
model helicopter, plane, etc.
2.Use the original carton/packaging (molded foam container) or equivalent to ship
your unit. Do not use the carton itself as a shipping carton; you should package
the equipment carton within a sturdy shipping container using additional packing
material to safeguard against damage during transit. Include complete name and
a d d ress information inside the carton, as well as clearly writing it on the outer
l a b e l / re t u rn address area. Ship your equipment fully insured and prepaid. Horizon
S e rvice Center is not responsible for any damages incurred during shipping.
3.Include detailed information explaining your operation of the equipment and pro b-
lem(s) encountered. Provide an itemized list of equipment enclosed and identify
any particular area/function which may better assist our technicians in addre s s i n g
your concerns. Date your correspondence and include your name, mailing
a d d ress, and a phone number where you can be reached during the business day.
Within your letter, advise us of the payment method you prefer to use. Horizon
S e rvice Center accepts VISA or MasterCard. Please include your card number and
expiration date.
4 .Wa rranty Repairs. To receive warranty service, you must include a legible photo-
copy of your original dated sales receipt to verify your pro o f - o f - p u rchase date.
P roviding that warranty conditions have been met, your equipment will be
re p a i red without charg e .
5 .N o rmal Non-W a rranty Repairs. Should your repair cost exceed 50% of the re t a i l
p u rchase cost, you will be provided with an estimate advising you of your options.
Mail your system to:
Horizon Service Center
4105 Fieldstone Road
Champaign, IL 61822
(217) 355-9511
w w w. h o r i z o n h o b b y. c o m
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10%
4%
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