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A123's (unregulated) and (Spectrum) DS821 & (HITEC) HS85

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Old 01-01-2011, 06:58 PM
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Iflyglow
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Default A123's (unregulated) and (Spectrum) DS821 & (HITEC) HS85

The question I have pertains to A123's and Spectrum/JR DS821 servo's and Hitec HS85 micro servo's. I am reconfiguring the radio installation in a Sundowner this winter upgrading to a A123 reciever pack, and I am wondering about the Hitec HS85 (Throttle) and DS821's control surface servo's. They are rated for 6 volts and I normally ran 5 cell NIMH packs, but there voltage comes down fairly quick. Has anyone experienced any problems with these servo's on A123's. I have googled this topic and come up with all kinds of responces, and Horizon told me it was not recommended with there 6V servo's (voltage to high).
Is anyone running these servo's with no problems?

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Old 01-01-2011, 08:02 PM
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A.T.
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Default RE: A123's (unregulated) and (Spectrum) DS821 & (HITEC) HS85


ORIGINAL: Iflyglow The question I have pertains to A123's and standard 6v servo's. I am reconfiguring the radio installation in a Sundowner this winter upgrading to a A123 reciever pack, and I am wondering about the Hitec HS85 (Throttle) and DS821's control surface servo's. They are rated for 6 volts and I normally ran 5 cell NIMH packs, but there voltage comes down fairly quick. Has anyone experienced any problems with these servo's on A123's. I have googled this topic and come up with all kinds of responces, and Horizon told me it was not recommended with there 6V servo's (voltage to high).
The higher the voltage, the faster the servo "burns" out.
Many say they have no problems using A123 and are pleased with the result, but they
tend to be those who have not been able to compare usuage/longevity of standard servos run on 5.0v.
Fortunately, there are (for example), Switchmode Regulators 5A(<10A] Continuous 6V or 5V readily available under different name brand labels (e.g. UBEC) and running 5V those olderservo will last well.
A good regulator also save the need for a BEC equipped ESC - those type BEC cause the most problems/crashes.
Electronic Speed Control - Why BEC and LVC cause most EP RX problems

Servo - Operating Voltage Range - (Futaba) usuage with NiMH, Lipol, LiFe & A123 batteries. #01
Servo - Operating Voltage Range - (Futaba) usuage with NiMH, Lipol & A123 batteries. #02
Servo - Operating Voltage Range - (Hitec) usuage with NiMH, Lipol & A123 batteries.
Servo - Operating Voltage Range - Hitec Pre-HV Servos useable with unregulated 2S Lipo
Servo - Operating Voltage Range - (JR/Spektrum) - max 6.0v fixed.
Servo - Operating Voltage Range - (Sanwa/Airtronics) with NiMH, Lipol, LiFe & A123 batteries.

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