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HelicopterRadio - Servo - Gyro - Gov - Batt › Anyone try the new futaba brushless servos?
09-12-2007 05:57 PM  10 years agoPost 1
Hydroman

rrApprentice

Kommifornia

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Anyone try the new futaba brushless servos? Any opinions on them?

The older I get, the better I was

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09-14-2007 04:10 PM  10 years agoPost 2
Hydroman

rrApprentice

Kommifornia

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Is it my breath? ...happy Friday all.

The older I get, the better I was

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09-14-2007 06:58 PM  10 years agoPost 3
Coolrunnin

rrVeteran

Manchester U.K.

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Just installing a BLS451 on my XLV's tail

Tested on the bench it's pretty quick for a high torque servo but we'll have to wait and see how it flies...

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09-16-2007 02:14 AM  10 years agoPost 4
Hydroman

rrApprentice

Kommifornia

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thanks cool, let us know how it pans out....im sure it will be smooth and very nice...

The older I get, the better I was

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09-16-2007 09:55 AM  10 years agoPost 5
AnnihilaT

rrKey Veteran

The Netherlands

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Im also very curious about using these new brushless ervos on the tail... if my thinking is correct, a tail servo failure which is the result of over exposure to fuel and oil because of a boom mounted location, could be eliminated by using a brushless servo in this location. Or am i wrong here... i was thinking that the failure is a result of oil and other gunk getting into the brushed motor and fouling the brushes and contact points to the motor. I could be wrong about that tho... what do you guys think?





A day without sunshine is like, well, night.

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09-16-2007 03:10 PM  10 years agoPost 6
Coolrunnin

rrVeteran

Manchester U.K.

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Not sure about increased resistance to oil. Yes these servos have no brushes in the motor to get contaminated but they still have a feedback pot which could be damaged.

I can't really test this on the XLV though as there is no oil residue produced to hit the servo

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09-16-2007 09:04 PM  10 years agoPost 7
DS 8717

rrProfessor

Here wishing i was somewhere else

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More of Futaba's bullsh!t advertising.They wont be any better than a brushed servo.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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09-17-2007 01:22 PM  10 years agoPost 8
Costas

rrApprentice

Adelaide - AUSTRALIA

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Many servos die due to vibration caused failure - motor normally goes open circuit due to either the windings going open circuit or the brushes failing.

The windings on a standard brushed servo motor are quite fragile due to the fact that they need to be on the rotor shaft. they cannot be too bulky or heavy as this affects the motor's response/speed etc.

On a brushless motor - the windings can be made a lot more substantial and rugged since they do not exist on the motor's shaft anymore. Coupled with the fact that there are no brushes (No commutator arcing or contact issues) then the reliability is increased quite substantially.

The only item left to perfect is the pot - It would be nice to replace the pot with a non contact linear device - maybe a linear hall effect sensor using a movable magnet and detecting the increase/decrease of a magnetic field to provide linear positioning feedback.

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09-17-2007 06:20 PM  10 years agoPost 9
Dr.Ben

rrMaster

Richmond, VA, USA

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For anyone who doubts that a brushless motor will have increased longevity, I would suggest you quiz a few e modelers asks them when was the last time the WORE out (not burned up or smoked) the brushless motor in their model. The unequivocal fact is that after 100 or more heavy flights, the performance of your average coreless t/r servo's motor begins to decline. The performance specs from the R&D on the new brushless servos show that this simply isn't occurring. As stated, the remaining wear items are gears and pots. Gears can be replaced, and pots still last a good while.

Ben Minor

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09-17-2007 07:42 PM  10 years agoPost 10
Four Stroker

rrElite Veteran

Atlanta

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I used to dissect dead servos to see why they failed. It was always the motor. Pot failure is a very obvious jumping around and oscillating across the hole in the carbon. You have plenty of time to do something about it. I have a BLS251 on order. I am waiting for the BLS255.

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09-17-2007 10:48 PM  10 years agoPost 11
RCMed-x

rrVeteran

westpalmbeachflorida usa

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I have had my tail servo rear mounted on all my helis oil, alcohol ,and water soaked w/out problems I think most failures are due to setup and hard tail stops IMO brush-less will be a lot better

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09-18-2007 08:40 PM  10 years agoPost 12
Andi G

rrVeteran

Switzerland

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More of Futaba's bullsh!t advertising.They wont be any better than a brushed servo.

JRYSOSXLEVOMAN
I wonder what your opinion will be if JR ever makes a Brushless servo

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09-18-2007 09:01 PM  10 years agoPost 13
DS 8717

rrProfessor

Here wishing i was somewhere else

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Jr went a different way,they have a 3 year warrenty.If or when a servo fails they give you a new one.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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09-18-2007 09:45 PM  10 years agoPost 14
mcfast

rrKey Veteran

Quebec Quebec Canada

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"3 year warrenty.If or when a servo fails they give you a new one."

That really helps when your Helli is total!

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09-18-2007 10:20 PM  10 years agoPost 15
DS 8717

rrProfessor

Here wishing i was somewhere else

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add The price of a new 9256 servo when your using Fubar, to the cost of the heli damage.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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