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**StreetDragster** · 02-03-2010, 03:48 PM

I think your going to get a nice mix of opinions here with no clear 'winner', as some people are prepared to take the risk of burning out the servo, and the other won't but may suffer a step down failure, both loosing tail authority.

Personally, i run with a step down

Matt

**Bruinbear** · 02-03-2010, 03:49 PM

The Futaba S9254 is suppose to be run at 4.8 volts only. I believe that some people do run them at higher voltages though ? You could go for an Align DS620. It's pretty similar spec and can be run at 6 volts.
Mike.

**Smoothound** · 02-03-2010, 03:52 PM

Not again

You can run it at 6.0v fine as that is what it was designed for, what it was not designed for was running at higher voltage. Dates back to the use of 4 cell(6.0v) and 5 cell(7.5v) NiCd and NiMh Rx packs. The people insisting on using a step down are wrong

How many times does this need to be dragged back up for more misinformation to be propagated?

Stuart time for a Sticky I reckon

**Adrian** · 02-03-2010, 03:58 PM

At one piont i was running 3 9254 without a stepdown,and touch wood ive never had a problem with this,and was even advised by a very well know lhc that you shouldent need it, and the guy that advised me never ran one and never had any probs.

Its just peace of your own mind i supose,you may never have an issue running one without but then you may have a prob with the stepdown like a loose wire

I think it says on the 2 in1 manual that the 9254 is ok to have 6v through it ,or i read it somwhere.

The choise is yours aidi

**Mark_T** · 02-03-2010, 04:01 PM

If the uncertainties are worrying you then just change to a DS650 which is rated for '6V' use.

As has been repeated many times on this forum, Futaba don't say you cannot run from a regulated 6V supply (or around 5.8V in case of the 2-in-1) they just don't want you to use a 5 cell (nominal 6V) nicad/nimh pack as the peak voltage is considerably higher than 6V.

A 4 cell pack (nominal 4.8V) produces peak voltages closer to the output from the 2-in-1 when fully charged.

They just use 4.8V = 4 cell and 6V= 5 cell as those were the packs commonly in use when this all started.

If anyone has the instruction sheet that ships with the 9254/401 combo you'll see it contains these words :

'Voltage- use only with a 4.8V battery. (if you use it with a
higher voltage battery it needs to be regulated to 6V)'

**machasm** · 02-03-2010, 04:10 PM

As you can tell from the replies Aidi, there are mixed opinions on running the 9254 at 6V. What I can say for certain though, is that the step-down can be prone to failure with the leads breaking off!
So I would advise not using the step-down if you can avoid it. Whether to run your 9254 at 6V is your choice.
Ade.

**Aidi** · 02-03-2010, 04:40 PM

I know this has been brought up before, but when you read so many posts from reputable people and some say yes, and some say no its hard to make a decision.

I was just fishing again to see what the reaction was from the community... Someone might have done some further investigation and found a solid reason as to why you can/can not run at 6v.

I fully expected to get yet another mixed bag of opinions.

From what i am reading, i am just going to be done with it and order a 620. There is too much at stake with a Trex 700 to cut corners. For it to go in due to a £5 component or the risk of a burnt out servo is just not worth it.

Thanks for the replies... 620 on order, 9254's up for sale soon!

Rgds
Aidi

**barney** · 02-03-2010, 05:37 PM

NOOOO dont get a 620..get the 650 Tail servo

As for 9254 running at 6.0v mine would last 6-8 mths on the tail, whilst dropped down I see about 18months. Your choice.

Personally I run the 650's at 4.8 v myself

**Mojo** · 02-03-2010, 05:42 PM

Just a question guys.. Does that argument (4.8v unregulated and 6v regulated) extend to other makes as well? I have JR servos running with a step down and was wondering if they could run without a step down straight from the 2 in 1..

On one of my helis its not such a big deal as i have a fromeco arizona and the servo plugs straight into the reg. I have had a discussion about it and was told about the fact that a fully charged 4.8v nicad is nearly 6v straight off the charger..

**Aidi** · 02-03-2010, 05:45 PM

Originally posted by barney View Post

NOOOO dont get a 620..get the 650 Tail servo

My bad... It was a 650 i ordered! And ill be running it at 6v. It clearly states its capable, so that is good enough for me!

Rgds
Aidi

**Aidi** · 02-03-2010, 05:53 PM

Originally posted by Smoothound View Post

Not again

You can run it at 6.0v fine as that is what it was designed for, what it was not designed for was running at higher voltage. Dates back to the use of 4 cell(6.0v) and 5 cell(7.5v) NiCd and NiMh Rx packs. The people insisting on using a step down are wrong

How many times does this need to be dragged back up for more misinformation to be propagated?

Stuart time for a Sticky I reckon

I understand the issue with NiCad voltages etc, but it clearly states that the servo needs to run at 4.8v I am aware that it is possible to run at 6v of a regulator and lipo, but it needs to be stated by Futaba that this is fact.

Ok, i have been running my 700 on a 9254 and stepdown, but i want to irradicate the risk of the stepdown failing or the servo dying whilst running at 6v. A £1000 worth or Trex 700 is not worth the risk.

As this post proves, there are too many who argue for/against it, and until Futaba state that running the 9254 at 6v on a reg/lipo is ok then its a risk i personally wont take.

Everyone has their opinion and views, which makes this forum great... Its their choice once they have asked the question as how they wish to proceed.

I appreciate all the comments.

Rgds
Aidi

**Smoothound** · 02-03-2010, 06:07 PM

At the end of the day IMHO 9254's are not the most reliable servos available run at any voltage. Your money is far better spent elsewhere that is my honest opinion

I no longer have any here at all for just that reason. All tail servos have to work hard but some just do it for longer without complaining

**jamiem** · 02-03-2010, 07:17 PM

I've had a 9254 running at a regulated 6v on throttle for the best part of 2 years without any problems.....

**Smoothound** · 02-03-2010, 07:19 PM

Originally posted by jamiem View Post

I've had a 9254 running at a regulated 6v on throttle for the best part of 2 years without any problems.....

There's always one

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9254 @ 6v Yes/No?

9254 @ 6v Yes/No?

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