Jr servos on 7.4 v

[j2tgw]

Hi
can you run ds8915 sevos on 7.4 lipos direct ?
i normally run 6v but was going to try a 2 cell lioo
in my new heli

cheers

[bigbladelittleblade]

I would use a BEC personally, Found this on helifreak,


Using DS8915 Servos Without a voltage
regulator
The latest trend in 3D heli flying is to run digital
servos via receivers being powered direct from
two cell lithium packs. Fresh from charge, this
can mean voltages in excess of 8 Volts. In the
USA some of the top 3D guys are running
DS8717 servos in this manner and appear to
get away with it for a short while, although
service life is sure to be reduced.
JR have confirmed that the DS8717 is exactly the same servo as
the DS8915, re-badged for the US market. However we would
strongly recommend NOT running DS8915 servos in this manner
as they will not be covered by our warranty. This is also true of
other current JR servos, which should also not be run direct from
a 2 cell lithium pack. If you wish to use lithium batteries to power
your R/C system then please use a good quality regulator at the
recommended voltages for the JR servos and gyro being used.
JR were concerned enough about this to issue a short statement,
which is reproduced below:
“Although JR does not guarantee the DS8915 servo to work at
8.0V, this servo does seem to be workable with 8.0V. But if you
use the DS8915 with 8.0V then this will be at your own risk. JR
regret that we cannot give our approval for such use.”
Please also note that we will be unable to repair any burnt out
DS8717 servos. We will be advising service customers with such
servos that they have been sold grey imports and to return them
to their supplier for a full refund.

hope this helps

[j2tgw]

Anybody on here using these servos on 7.4 v ? Or can anyone
recomend a good voltage reducer ?
The servos are well out of waranty ! That's not an issue
just don't want them to fail In flight
cheers Tom

[bigbladelittleblade]

I use the CC BEC Pro version 3, selectable voltage output and a decent price,
Castle BEC PRO Switching Regulator CSECCBECPRO

[j2tgw]

This is for a nitro heli ! so a bec will not work
Think I'm going to have to go for new servos

Tom

[10x]

I use life batteries at 6.6v in all my heli's except the 600....
A123 Battery Pack 2 Series 2500mAh

[Yanga]

Gryphon extreme regulator is pretty good. I got a spare one you can try if u want.

[Mike Sanders]

I use LIFE batteries, 1700 mah Turnigy from Hobbyking.

[sparts]

I got this from HobbyKing UK Warehouse.£15 ish.

[j2tgw]

Thanks for all the help guys .
But I have just decided to go for a set of hv servos seeing that fastlads have a sale on
wont have any probs that way .I hope ?
Cheers Tom

[Paulo uk]

Ive had a 700e on these direct from a 2s lips for a couple of years. If I remember rightly - JR issued a statement saying that these servos have been tested at 8.4v and they support it.... Ill try and find it.