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04-23-2013 07:21 PM  5 years agoPost 1
blucido

rrApprentice

Plano,Texas

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Running a Savox SB2272 for a tail servo on 7.4 volts, having to turn my gain down into the low 50's, have tried moving my servo horn hole in to about 13.5 mm from 16.5 mm no difference,still get tail whobble in a strong tail down funnell, I'v been told to try a BLS251 tail servo, but everywhere I look it says only good for 4.8 or 6.0 volts, no high voltage 7.4 ? or do I step it down or what?

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04-23-2013 07:37 PM  5 years agoPost 2
fastrc1

rrKey Veteran

Planet Brooklyn, NY-USA

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Step it down to 5.2 and you should be fine. Make sure the linkages and pushrod are as smooth and slop free as possible.

RIP Roman Pirozek Jr.
Team Futaba USA
Team Kontronik USA
http://flysrw.com

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04-23-2013 08:52 PM  5 years agoPost 3
Dr.Ben

rrMaster

Richmond, VA, USA

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Make life simpler and just use a BLS256HV.
Do not run a BLS251 on 2S lipo. No big money difference between the the HV tail servo and the 251.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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04-23-2013 09:12 PM  5 years agoPost 4
blucido

rrApprentice

Plano,Texas

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Tail servos
I don't get it ,I thought that the Savox was their best servo out, if you look st it's spec at 7.4 volts = .032 speed and 97.2 torque, Futaba's BLS256HV is .05speed and 69.5 torque. why would this be a better servo ? I read the forums and a lot of people have said that the BLS251 would allow them to run a lot higher gain ,and as i mentioned above thats my delima,i'm down to 52 gain on my radio with Vbar 5.3 with this Savox.

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04-23-2013 11:49 PM  5 years agoPost 5
Dr.Ben

rrMaster

Richmond, VA, USA

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You are making the all too common mistake of judging a servo's performance by simple comparison of torque and transit time. I can assure you with absolute certainty that there is far more to what makes a tail servo work well, especially the Futaba tail servos, than just speed and torque. You are talking about inherent control amplifier design and how the servo responds to output from the gyro.

For clarification, the BLS256HV should for all intents and purposes be regarded as a high voltage version BLS251. Driven by their "native" voltage, they perform much the same.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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04-24-2013 12:13 AM  5 years agoPost 6
resort

rrNovice

waretown new jersey usa

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What amp receiver battery packs are you guys using in large gasser helicopters?

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04-24-2013 01:43 AM  5 years agoPost 7
Funky Trex

rrElite Veteran

Westerville, OH - USA

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I run a brushless 2272, bls251 & bls256 in 3 of my helis (as well as an older 9251 & 9256 in some old nitros). They all perform quite well, although the Futabas have a great feel to them. Despite the lower specs, they are solid as a rock.

We have had a few 2272 failures at our field too. I have one that buzzes very loud when powered up and won't hold any torque. I have run many different gyros and tail servos so I don't think it is a setup issue. My other 2272 seems like a good servo and is still running strong in my 550, but the only Futaba tail servos I have ever had go bad were old 9254s. I have never had an issue with their top of the line tail servos and they are worth the extra money IMO.

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04-26-2013 01:28 PM  5 years agoPost 8
Richardmid1

rrProfessor

Leeds, England

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Remember the BLS256HV is also a narrow pulse tail servo, the Savox isn't.

The BLS256HV is the best tail servo ive ever had!

Blucido, first check your tail mechanics for for smooth friction free operation by removing the control rod at the servo and moving by hand. Second check your boom supports and boom clamp for loosness, this can make a huge difference in the amount of gain you can run!

60% of the time, it works every time!

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04-26-2013 01:44 PM  5 years agoPost 9
blucido

rrApprentice

Plano,Texas

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tail servo's
All the mechanics are good as well as the tail booms,which I epoxy,but don't mean to ask a stupid question but can you or someone explain about a narrow pulse servo and what effect this plays!

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04-30-2013 03:06 PM  5 years agoPost 10
Richardmid1

rrProfessor

Leeds, England

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Basically if the pulse width is halved and in this case it is, the servo can react much faster and the difference is noticable.

60% of the time, it works every time!

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04-30-2013 03:21 PM  5 years agoPost 11
blucido

rrApprentice

Plano,Texas

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Thanks for the explanation, what is odd is that I had the Vbar set so i could adjust the tail gain through my radio a DX7, and i was down to 52 and it was whobbeling in this hard tail down funnel, so i went back to the Vbar and reset it so i could slide and correct the tail gain on the front menu, it did great and i was able to move the slider up to 75 ,for what it's worth it's working fine now!

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