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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › BLS 251 work on 6 volts?
05-31-2013 04:00 AM  5 years agoPost 1
Wedge77

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St. Charles Missouri USA

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is it ok to run a bls 251 on 6 volts.. safely?
thanks guys

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Goblin 630, 12 cell
Vibe 50N Fbl
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05-31-2013 04:45 AM  5 years agoPost 2
MarshallB

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Middle Arkansas

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I run mine on roughly 5.1 volts on the JR regulator. I would not if it were me. Some may do it but not sure how long it will last long term.


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05-31-2013 05:44 AM  5 years agoPost 3
Wedge77

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St. Charles Missouri USA

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thanks, Im goin to turn down the reg to 5.1 just didnt wantto fry it.
thanks again
Wedge

JR NEX E8, 12 cell
Goblin 630, 12 cell
Vibe 50N Fbl
Century E640 Fbl, 12 Cell

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05-31-2013 08:46 AM  5 years agoPost 4
RogerRabbit62

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Thuerigen germany

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works on 6

there is a official permit from their german distributor also

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05-31-2013 09:57 AM  5 years agoPost 5
modtron

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Oxford. UK

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works on 6
there is a official permit from their german distributor also
Very strange as Futaba Japan & USA and Robbe in Europe all say 4.8v only.

modtron
Oxford UK

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05-31-2013 11:36 AM  5 years agoPost 6
RogerRabbit62

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Thuerigen germany

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You might have old Information

http://www.robbe.de/brushless-servo-251mg-760-s.html

it states 4.8-6V

download "Liste.pdf" then you see the changes in the product range.

you can run BLS451/452 on 2s straight now also.

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05-31-2013 11:41 AM  5 years agoPost 7
modtron

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Oxford. UK

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Good luck then but I will still stick by what the manufacturers say.

modtron
oxford UK

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05-31-2013 11:50 AM  5 years agoPost 8
RogerRabbit62

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Thuerigen germany

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Sure, you are absolute correct that Futaba Japan does specify N/A.

I did think about it the same like you. But the argumentation from robbe after some discussions with them is to be considered also and i do it their way now.
They never advised me bad so far.

They say if you have a step down converter in between it is one part more which can fail.
If you have the cheap diode solution it is not a real constant voltage.
So the straight 5 NiMH solution is the best.

Nevertheless if you run 2s direct you Need the BLS256HV. I run that on another bird.
The bls256hv on 2s and the bls251 on 5 NiMH are about same temperature after flight - but it is not exactly comparable because it is different birds.

If you want to be sure change the servo to the bls256hv that one can run 5NiMH or 2s but not 4Nixx

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05-31-2013 11:58 AM  5 years agoPost 9
Ronald Thomas

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Gainesville, Fl, USA

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I have run all my BLS 251s at REGULATED 6v for years. Never an issue and they never get over 86 degrees (I measure all my equipment in the FL heat . )

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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05-31-2013 12:43 PM  5 years agoPost 10
4cyclic

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Montreal, Can. and northern Vermont

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Same, running for last 3 yrs on 6v, no issues.

Life is meaningful flying helis.

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05-31-2013 03:50 PM  5 years agoPost 11
Wedge77

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St. Charles Missouri USA

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Thanks guys, Im on a regulated system so should be good to go,

JR NEX E8, 12 cell
Goblin 630, 12 cell
Vibe 50N Fbl
Century E640 Fbl, 12 Cell

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05-31-2013 06:12 PM  5 years agoPost 12
MarshallB

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Middle Arkansas

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Thanks guys, that's good information to know. These servos are second to none except for the HV-BLS256.

How are you guys running at 6 volts? What regulator are you using. I usually run at straight LiFe but that's quite a bit higher than 6 volts. I usually use the Spektrum or JR mini regulator and those have worked flawlessly for years.


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05-31-2013 06:48 PM  5 years agoPost 13
Ronald Thomas

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Gainesville, Fl, USA

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I use the Spektrum VR5203, perfect and it has two input/outputs as well so if you need the other port for a throttle servo (nitro) it is there.

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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05-31-2013 11:57 PM  5 years agoPost 14
Zaneman007

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Texas - USA

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Don't be a Guinea pig
I destroyed a perfectly good BLS251 by inadvertently putting it on a 6.0 volt regulated system. It didn't last 5 minutes.

Thats not to say that it has not work for some.

Thats to say that if it goes poof, no one including those encouraging you to do it will PAY you for the cost of replacing it, and you will void the warranty.

So to answer your question; no it will not safely work on 6 volts.

Old Guys Rule!

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06-01-2013 02:05 AM  5 years agoPost 15
Ronald Thomas

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Gainesville, Fl, USA

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What are the details? Did you have the wrong setting in the gyro selected as well? Did you shave the tab off the connector and inadvertantly plug it in backwards?

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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06-01-2013 05:10 AM  5 years agoPost 16
Zaneman007

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Texas - USA

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Really, that's all you can say?
And how old are you?

Old Guys Rule!

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06-01-2013 05:24 AM  5 years agoPost 17
3dgimble

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Rochester

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I had one heli BLS 251 regulated at 6 volts, never got warm or made any sort of funny noises, so then i went to two helis on 6 volts no funny noises zero heat, always cool to the touch after back to back flights.
I did the same for a couple of my buddy helis and same result. After 200 plus flights on just one heli and 18 months of use, I would say its okay to run 6 Volts, I now have a 700 size heli running at 6.5 volts with same results, cool to the touch after back to back flights and no apparent sound of strain.
I believe it is possible to go higher but I have no reason to run more than 6.5 volts.

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06-01-2013 07:10 AM  5 years agoPost 18
RogerRabbit62

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Thuerigen germany

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Thanks guys, that's good information to know. These servos are second to none except for the HV-BLS256.
How are you guys running at 6 volts? What regulator are you using. I usually run at straight LiFe but that's quite a bit higher than 6 volts. I usually use the Spektrum or JR mini regulator and those have worked flawlessly for years.
What is negative on the BLS256HV?
Had no trouble so far on 2s straight.

I run BLS251 from 5xNiMH
256HV from 2s

No regulators

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06-01-2013 09:59 AM  5 years agoPost 19
Ronald Thomas

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Gainesville, Fl, USA

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Really, that's all you can say?
And how old are you?
I was just trying to get to the root of what happened with your servo. If that servo only lasted 5 minutes something bad had to be wrong with it or there was a setup issue. I personally don't think the 6v killed it, I think you had a bad servo from the start and unfortunately it croaked 5 minutes in.

Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!

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06-01-2013 10:26 AM  5 years agoPost 20
RogerRabbit62

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Thuerigen germany

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+1
they do not fry on 6v
not even on 7.5 from my experience.

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