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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › BLS 251 on a LIFE Pack??
05-07-2013 07:50 AM  6 years ago
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Machinehead01

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Lower Michigan

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BLS 251 on a LIFE Pack??
Anybody strait running their BLS251 tail servo on the LIFE pack's 6.6 volts? I am setting up a Skookum FBL(540) and was wondering if was possible to do it without a step down.

Tom
"You judge according to the flesh; I am not judging anyone."
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05-07-2013 07:58 AM  6 years ago
James Allen

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South West, OH USA

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I'm not sure if anyone has run them over 6 volts, but Futaba doesn't recommend it.

BLS251 Brushless Digital Heli Rudder Servo
FUTM0521
Volts Torque Speed
4.8V 53.0 oz-in (3.8 kg-cm) 0.06 sec/60°
6.0V n/a n/a

Dimensions Weight
1-9/16 x 13/16 x 1-7/16 in
(40 x 20 x 37 mm) 2.2 oz (61 g)

2BB, MG, WP, BLS, MCC
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05-07-2013 09:59 AM  6 years ago
RogerRabbit62

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Thuerigen germany

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I run them on 5 NiMH.
It is allowed to do so, there is a printed sheet in the package (at least here in germany).
They are warm after the flight, but i did not have any trouble (at least in the 30 hrs airtime they are in that heli).
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05-07-2013 11:46 AM  6 years ago
Ronald Thomas

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Gainesville, Fl, USA

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I run all mine at a regulated 6volts with a step down from 8volts. Never an issue and they come down 86 degrees
I would not trust it over 6volts though. A small in line step down will bring it down below 6volts.
Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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05-07-2013 12:28 PM  6 years ago
Chuck Bole

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Tulsa Ok. U.S.A.

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You could put one of these inline to regulate it to 5V.
http://www.futaba-rc.com/accessories/futm0960.html

chuck
Team Synergy Field Representative / Rail Blades / Scorpion Power Systems / HeliLids
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05-07-2013 12:59 PM  6 years ago
Machinehead01

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Lower Michigan

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Just what I was looking for....
Thanks cgbole's .
"You judge according to the flesh; I am not judging anyone."
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05-07-2013 01:15 PM  6 years ago
Four Stroker

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Atlanta

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Futaba reg. above works well. LDO means 5 volts in gives about 5 volts out. Better than a diode which always gives ~0.7 volt drop.
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05-07-2013 02:04 PM  6 years ago
RogerRabbit62

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Thuerigen germany

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I would not go with a 1 Amp regulator for a BLS251
Far too weak.

Please consider using a 3amp minimum regulator.
I just had a discussion with the distributor for those here and decided not to go that way at all but to exchange against the BLS256 HV.
That one can be run from 5 NiMH, LiFePo direct, Lipo direct.

One less part (voltage regulator ) that can fail.
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05-07-2013 02:16 PM  6 years ago
Four Stroker

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Atlanta

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Very good points. Average tail servo current can exceed 1 Amp depending on installation and flying.
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05-07-2013 02:42 PM  6 years ago
jschenck

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La Vista, NE.

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Futaba rates it at 6V - this is interpreted to be a 5 cell Nickel based battery. 5 cell packs are over 7V off the charger and are not safe voltage wise under 6V. I would not run a 5 cell Nickel based battery pack below 6.4V, same as the liFe pack.

Personally, I would have high confidence running the BLS251 off straight LiFe voltage, no regulator. One poster above has ran his off a 5 cell Nickel pack, no problems. I've run many tail servos off straight LiFe, no problems in a number of years doing so. No regulator to buy or fail. Nice simple clean setup.
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05-07-2013 02:42 PM  6 years ago
rexxigpilot

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I have 4 nitro helis that use the BLS251 and LiFe (A123) packs. All have over a hundred flights without a single issue.
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05-07-2013 03:03 PM  6 years ago
RogerRabbit62

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Thuerigen germany

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After calling up the distributor they told me that the BLS251 needs a 3Amp minimum regulator.

Might be that information helps.

They advise the BLS256HV for that application with Lifepo and lipo and without regulator.
2 connectors less, 1 electronic less, cheaper than BLS251 + regulator.
On 5 NiMH they give the advice that BLS251 and BLS256HV can be run direct and have no lifetime difference.

They do not like the regulators much. It seems that there have been problems, but they did not go in details.
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05-07-2013 03:10 PM  6 years ago
Four Stroker

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Atlanta

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Does a hundred flights seem like forever to you guys ?
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05-07-2013 03:27 PM  6 years ago
Ronald Thomas

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Gainesville, Fl, USA

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Regulator
Spektrum VR5203 is what I use as a regulator. Dial outputs, up to 10 volts, 3 amps peak capable.

http://www.readyheli.com/JRPVR5203-...or-p-34627.html
Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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05-07-2013 03:28 PM  6 years ago
jjeaster222000

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Bedford in

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All distributers want to do is sell the new product.. I have loads of flights on the bls251 on regulated 6v.. no issues what so ever..
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05-07-2013 03:33 PM  6 years ago
RogerRabbit62

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Thuerigen germany

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Definite wrong.
They offered to take the BLS251 back and exchange against the BLS256HV.
They only wanted to charge the difference.
I think now the markets are a bit dull and they care more for customers then a few years ago.

I decided to get the BLS256HV additional and use the BLS251 as spare for one of my other birds (it will sit there for a long time i hope...)

And you have a REGULATED 6V. The servo is rated til nominal 6V which mean 7V peak on a NiCAD or NiMh which is the source for the spec. You are absolute in the safe area.
But 8.4 is definite a killer for it.
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05-07-2013 03:42 PM  6 years ago
jjeaster222000

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Bedford in

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Im running a BLS251 on my Whiplash gasser with about 5 hours of time on it. I have a 5 cell NICD and a jewel gen on it and it never gets hot. Maybe i should put a in line drop down on it?
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05-07-2013 03:54 PM  6 years ago
Ronald Thomas

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Gainesville, Fl, USA

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Torque @ 4.8V: 47 oz-in
- Speed @ 4.8V: 0.06 sec
- Dimensions: 1.6 x .8 x 1.5" (40.6 x 20.3 x 38mm)
- Weight: 2.2oz (61g)
Nominal voltage is 4.8 volts, peak 6
Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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05-07-2013 04:54 PM  6 years ago
eddiscus

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Dumont, NJ-USA

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Been running one of these on my Logo 600 and have had no problems for the past couple of years.

http://www.western-robotics.com/STVR_hp.html
Logo Xxtreme 800
Logo 700
Citizen 142
Synergy 766
TDR 2
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05-07-2013 04:55 PM  6 years ago
Ronald Thomas

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Gainesville, Fl, USA

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Perfect and only $6Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › BLS 251 on a LIFE Pack??
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