uro

what is a reason to use only nicad with digital servos.
thanks for your reply.

tkilwein

I use HS5955TG Digital servos with 5014 RX futaba rec, Fromeco Regulators and 7.4v LIPO's with no problems.
I measured the current draw in flight and with short spikes up to ~12 amps.
Using nicads the voltage drops some where the reg+lipos do not.

Just my testing.

Tony

uro

The volts in the servo with the regulator is 4,8
thanks

Panzlflyer

My Feedback: (15)

The reason is that early Nimhs like the 1650 cells could not sustain any large current draws and as that may occur with Digitals they covered themselves.
Times have changed and we now have Lithium as well as the newer high current NIMHs.
Just make sure your batteries are up to the demands of the servo and youre good to go.

dirtybird

My Feedback: (5)

12 amps? How did you measure that?
In my testing of the 5955 3 amps were the maximum at full torque. 12 amps would mean at least 4 servos with max load at the same time. What were you doing to that airplane?

mglavin

My Feedback: (31)

Manufacturers suggest NiCad's in lieu of AA Alkaline batteries or similar, these battery chemistries are unable to provide the required current to sustain digital servos as designed. OEM's should update the aforementioned information as other chemistries such NiMH and Lithium Polymers work fine too.

tkilwein

Hi Dirtybird,

I had someone else semi-blender, snap, spin, twist and shout it. Some done at near full stick-speed with radical banks, turns and direction changes.
I have a voltage, current and temp monitor by eagletree in it, sampling at 10x second.
Checked the eagletree monitor out with a calibrated voltage and current probe and it is within 5%, close enough.
My deflections on ailerons ~17, elevators ~14 and rudder ~27 degrees. Regulators set to 5.8v
AW 36% katana, DA100, HS5955TG around, 2 per aileron flap, 1 per each elevator half, 2 on rudder and futaba 9252's on choke and throttle.
All servos are new, version 1.04 on the HS5955's.