While R921X receivers’ minimum operational voltage is 3.5 volts, it is highly recommended
the system be tested per the guidelines below to a minimum acceptable voltage of 4.8 volts
during ground testing. This will provide head room to compensate for battery discharging
or if the actual flight loads are greater than the ground test loads.
Recommended Power System Guidelines
1. When setting up large or complex aircraft with multiple high-torque servos, it’s highly
recommended a current and volt-meter (Hangar 9 HAN172) be used. Plug the voltmeter
in an open channel port in the receiver and with the system on, load the control surfaces
(apply pressure with your hand) while monitoring the voltage at the receiver. The voltage
should remain above 4.8 volts even when all servos are heavily loaded.
Note:
The optional Flight Log has a built-in voltmeter and it can be used
to perform this test.
2. With the current meter inline with the receiver battery lead, load the control surfaces
(apply pressure with your hand) while monitoring the current. The maximum continuous
recommended current for a single heavy-duty servo/battery lead is three amps while
short duration current spikes of up to five amps are acceptable. Consequently,
if your system draws more than three amps continuous or five amps for short durations,
a single battery pack with a single switch harness plugged into the receiver for power
will be inadequate. It will be necessary to use multiple packs of the same capacity
with multiple switches and multiple leads plugged into the receiver.
3. If using a regulator, it’s important that the above tests are done for an extended period
of 5 minutes. When current passes through a regulator, heat is generated and this heat
causes the regulator to increase resistance, which in turn causes even more heat to
build up (thermal runaway). While a regulator may provide adequate power for a
short duration, it’s important to test its ability over time as the regulator may
not be able to maintain voltage at significant power levels.
4. For really large aircraft or complex models (for example 35% and larger or jets),
multiple battery packs with multiple switch harnesses are necessary or, in many
cases, one of the commercially available power boxes/ busses is recommended. No
matter what power systems you choose, always carry out test #1 above making sure
that the receiver is constantly provided with 4.8 volts or more under all conditions.
5. The latest generation of Nickel-Metal Hydride batteries incorporate a new chemistry
mandated to be more environmentally friendly. These batteries, when charged with
peak detection fast chargers, have tendencies to false peak (not fully charge) repeatedly.
These include all brands of Ni-MH batteries. If using Ni-MH packs, be especially
cautious when charging making absolutely sure that the battery is fully charged. It is
recommended to use a charger that can display total charge capacity. Note the number
of mAh put into a discharged pack to verify it has been charged to full capacity.
Warranty and Repair Policy
Warranty Period
Exclusive Warranty- Horizon Hobby, Inc., (Horizon) warranties that the Products purchased
(the “Product”) will be free from defects in materials and workmanship for a period of 3 years
from the date of purchase by the Purchaser.
3 Year Limited Warranty
Horizon reserves the right to change or modify this warranty without notice and
disclaims all other warranties, express or implied.
(a) This warranty is limited to the original Purchaser (“Purchaser”) and is not transferable.
REPAIR OR REPLACEMENT AS PROVIDED UNDER THIS WARRANTY IS THE EXCLUSIVE REMEDY
OF THE PURCHASER. This warranty covers only those Products purchased from an authorized
Horizon dealer. Third party transactions are not covered by this warranty. Proof of purchase is
required for all warranty claims.
(b) Limitations- HORIZON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR
IMPLIED, ABOUT NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE OF THE PRODUCT. THE PURCHASER ACKNOWLEDGES THAT THEY ALONE HAVE
DETERMINED THAT THE PRODUCT WILL SUITABLY MEET THE REQUIREMENTS OF THE
PURCHASER’S INTENDED USE.
