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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › What is the euqivalent of a Futaba 9254 ?
10-15-2018 11:48 AM  11 months ago
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Infarcted

rrApprentice

downunder

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What is the euqivalent of a Futaba 9254 ?
Guys,

Just realised they don't make the Futaba 9254 rudder servo anymore. Can someone point me out what's the equivalent one of say Hitec or JR which is compatible with a 401 gyro and is 4.8 to 6.0 volt , ie not the high voltage brushless ones ?
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10-15-2018 12:15 PM  11 months ago
Dan Minick

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Columbus, WI

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The Jr DS8900G is almost identical. Bit faster, even. I might even have one to sell you for cheap if I remember correctly!Team Synergy, Team FBL Rotors-------if its not broke...it will be!
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10-15-2018 03:11 PM  11 months ago
wjvail

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Meridian, Mississippi

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Infarcted Just realised they don't make the Futaba 9254 rudder servo anymore.
I question the original assertion. See links below.

The 9254 has never been my favorite servo. I have found it to be an acceptable servo but fragile. It is sturdy enough. Speed and torque are acquitted. At $110 the price is palatable. Everything about it is just sorta blah.

If I were looking for a new $100 tail servo I might try the ProModeler tail servo. Specs are good. It's brushless. It's $80. I need to be clear, I don't personally own one; but, others speak highly of them. http://www.promodeler.com/DS120BLHV

I suppose I should ask, what gyro are you using? Can you use a 760us servo?

https://www.amainhobbies.com/futaba...futm0224/p12579

https://www.futabarc.com/servos/digital.html
"Well, nothing bad can happen now."
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10-15-2018 03:21 PM  11 months ago
JLF92677

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Southern California

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Futaba BLS254 would work and at a good price:

https://www.ebay.com/itm/2516712488...1d76198fff96489
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10-15-2018 03:50 PM  11 months ago
wjvail

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I'm sorry. Forget my ProModeler recommendation. I see you posted what gyro you are using. My excuse is that my wife was banging on about the seating chart for my son's wedding and my simple post took over 45 minutes to construct. In that time forgot what you had originally posted.

I stand by my comments on the 9254. They are just meh - but they appear to be available you have to have one.
"Well, nothing bad can happen now."
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10-15-2018 08:08 PM  11 months ago
dialarotor

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Traverse City, Michigan

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I have been replacing my Futaba tail servos with this model from Savox

https://www.ebay.com/itm/Savox-1290...f class=sml>f:0

Align DS610,620,650 are good choices too, made by Savox.
RapRexSynLogo Pilot
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10-15-2018 08:28 PM  11 months ago
ICUR1-2

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Ds620 or ds650 is the ALIGN equivalent.
If you can find them

Savox would be next
spending time, paying attention
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10-15-2018 10:53 PM  11 months ago
Infarcted

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downunder

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Thank you all for your posts. I always thought the newer brushless servos were high voltage. I am still using old equipment. i will look into all the previous suggestions .
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10-16-2018 11:48 AM  11 months ago
onebigjunker

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Wellsville, Ks

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I will sell you a 601 or 611, so you can use the newer type servo with it?work hard, play even harder!!!!
Team Empire Hobby/GAUI USA
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10-16-2018 01:19 PM  11 months ago
Richardmid1

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Leeds, England

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Align DS655. You can get the JR8900G cheap here in the UK though which would be my choice. Which ever you choose, don't run it above 5v.60% of the time, it works every time!
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10-16-2018 10:12 PM  11 months ago
datidun

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N Ireland

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Align ds655 is rated for 6v,going over that should not be a problem,been running mine for over 5 years from a Life 6.6v,that includes the Savox 1290.
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10-17-2018 09:28 AM  11 months ago
dialarotor

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Traverse City, Michigan

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update your battery power system and skip regulators
most all the servos above will operate on LiFe 6.6v without problems.
Came across this, freshen up all my heli battery packs for a fair price.
https://www.ebay.com/itm/5PCS-2200m...353.m1438.l2649
The Align & Savox servos are happy and so are my Futaba servos even the 9253 & 9254 tail servos. Lots of capacity for my 50 & 90 size helis.
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10-17-2018 11:29 AM  11 months ago
Richardmid1

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Leeds, England

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Be careful with that, I would only recommend running a tail servo at 6v+ IF:

1. You are running it at lower than 333Hz. (you could get away with 333Hz if the below are met).
2. It's an electric heli.
3. It's smaller than 700 size.
4. It's vibration free.
5. The tail pitch mechanics are totally free.
6. The servo arm length is optimal (gives at least 90 degrees movement from limit to limit).
7. The tail gain is optimal (no wag in very fast forward and backward flight).
8. You are only hovering or slow forward flight at a relatively low rpm.

It is just far safer to step a tail servo down to 5v, the performance is virtually the same. This is the whole reason why people see the 9254 as 'fragile'.

A tail servo failure in flight results in a fairly catastrophic crash unless you are very lucky. It's just not worth it.
60% of the time, it works every time!
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10-17-2018 11:56 AM  11 months ago
datidun

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N Ireland

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Back in the day a 4 cell nimh pack fully charged is around 6v to 5.8v,under load around 5.5v, no step down was needed either on any Futaba 9254, although I would not run a 9254 of a Life 6.6 without a step down, I ran my 9254 at 5.7v max.
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10-17-2018 11:57 AM  11 months ago
DemetriusUSN

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Virginia Beach, Va USA

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Wjvail...I’ve had the promodeler servos and they work flawlessly, fast, center well and on 5v up to 7.2v they work very well!!Minicopter Diabolo 800, Minicopter Triabolo 700, Minicopter Diabolo 700, Minicopter Diabolo 600, Minicopter Diabolo 550, Goblin 770
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10-17-2018 01:15 PM  11 months ago
Richardmid1

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Leeds, England

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The problem came when people started running the 9254 on regulated 6v. A 4.8v Ni-Cd pack would drop very quickly to 5v and after a flight or 2 would be down to maybe 4.5v and lower under load.60% of the time, it works every time!
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10-17-2018 02:44 PM  11 months ago
datidun

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If it was lower than 4.5v, the heli would most probably go in, 1.1 volts per cell on a nimh/nicad 4 cell pack is classified as flat, coming out at 4.4 volts.Life 6.6v pack under load is around 6.3 to 6.4 volts, plenty of room for a 6v rated servo.
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10-17-2018 03:16 PM  11 months ago
Richardmid1

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Leeds, England

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Brown outs don't usually occur till under 3.5v. 4.4v on a sitting 4 cell Ni-Mh would be near flat but we are talking under load. The problem with regulated 6v is it won't go much under 6v the whole time. Trust me there is a big difference between a 4.8v Ni-Mh pack and 6v regulated, as I say as much as 1.5v difference which doesn't sound like much but that is 33.3% more voltage!60% of the time, it works every time!
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11-21-2018 09:08 AM  10 months ago
InvertedDude

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USA

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Savox 1290mg is perfect replacement for the 9254 servo
$50.00 for a new one I think?

It is capable of running 6 volts!

I have one on my concept 30!
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11-21-2018 09:13 PM  10 months ago
Dr.Ben

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Richmond, VA, USA

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Richard is correct about trough voltage on a 4.8v NiCd/-MH pack under high instantaneous load and once surface charge has bled off and it's down at 4.9v or so. It easily drops to 4.5 volts momentarily.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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