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Home✈️Aircraft🚁HelicopterHIROBOOther › 9254 ALTERNATIVE?
07-17-2006 07:57 AM  14 years ago
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Prince Caramba

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Luxembourg

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9254 ALTERNATIVE?
Last weekend my futaba 9254 in my Freya gave up on me. I dont find any pleasure in buying a new servo every 3 months. What would be another way to go with gy-401 ??
I love the smell of helipad in the morning...
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07-17-2006 08:23 AM  14 years ago
Thomashome

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West Sussex UK

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JR8700, not the spec of the Futaba though - 3.5kg/0.09s and the 9254 is 4.8Kg/0.06s
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07-17-2006 09:09 AM  14 years ago
mrNoodles

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Borlänge, Sweden

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Have you had several 9254´s breaking?
If so I suggest checking the linkage for binding.
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07-17-2006 10:05 AM  14 years ago
Jasper7

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Birmingham , UK

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Be carfuel with the JR8700, heard they can hard over on initilisation of the Gy401.

Something about Jr Servo and Futaba Gyro not compatable

Do a search to confirm

Steve
Jasper 7
T-Rex 700N
T-Rex 600N
T-Rex 450Pro

Citizen Number: 00212
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07-17-2006 01:01 PM  14 years ago
LennyDude

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Maine USA

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I think that is true...........

I have the JR810G on my Evo with a 401...............everytime I initialize the gyro, the servo goes hard one way then centers.

It really does not concern me too much because I get no noise or vibes of any kind during this process. I don't think a lot of voltage is going to the servo during this time?

Really don't think it is "binding" in any way?

Lenny
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07-17-2006 01:29 PM  14 years ago
BarracudaHockey

rrMaster

Jacksonville FL

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Your linkage either has too much drag or you are running too high of a gain. I've had 9254's on two machines that fly every weekend since the servo came out and haven't had a servo related failure.Andy
AMA 77227
http://www.jaxrc.com
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07-17-2006 01:34 PM  14 years ago
Prince Caramba

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Luxembourg

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My linkage is smooth and nice. No problem there. Gain around 85. Servo is 5 months in duty.
No alternatives? Is it really only 9524?
I love the smell of helipad in the morning...
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07-17-2006 01:40 PM  14 years ago
mrNoodles

rrProfessor

Borlänge, Sweden

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85% sounds pretty high, how long servoarm do you use?
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07-17-2006 03:18 PM  14 years ago
wjvail

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Meridian, Mississippi

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💎Sustaining Member
I broke 2 of the dam 9254s in my R30 before I found a bearing going bad in the tail grip. All was very smooth until the heli spun up. At least I hope that was the problem. They were only lasting a gallon or two.

As a side note, every time a 9254 broke and I returned it to Hobby Services, I installed a spare Airtronics 94758 so I could keep flying. In the course of shipping and returning the 2 9254 they accrued about 5 hours (total) and the 1 94758 had six hours. Granted I should have caught the failing bearing but my conclusion is that the Futaba servo is VERY fragile and much less tolerant of problems.

I should add that this 3rd 9254 now installed has only 50 oz of fuel and 1 hour run time. I may not have truly found the problem. If this one fails I'll put the trusty, rusty Airtronics in again and mail another Futaba back.

One more thing, the 9354 is a better performing servo with the 401 than the 94758 or I'd have just left the Airtornics in. The difference isn't huge but it is noticeable. The 94758 wasn't meant to be a tail servo but it does work very well, especially if you're not doing 3D.

Bill Vail
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07-17-2006 04:25 PM  14 years ago
BarracudaHockey

rrMaster

Jacksonville FL

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Thats quite a bit of gain.

Make sure your limit is at or above 100, if you have to move in on the servo arm do so.

Also only use the gain you need to hold the tail, cranking the gain up until wag then backing off a hair is too much gain and you will burn up the servo. I set my by flying fast sideways, if it will hold that I call it good.
Andy
AMA 77227
http://www.jaxrc.com
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07-18-2006 04:19 AM  14 years ago
Dr.Ben

rrMaster

Richmond, VA, USA

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Too much gain.

I've put as much as 25 gallons through a 9253/9254 with no issues. In all likelihood, you're literally working the poor servo to death.

You ought to be able to achieve a reasonable hold on the tail with a gain in the 50 to 60's % with around a 12.5 to 14mm tail servo arm radius.

Ben Minor
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07-18-2006 05:25 AM  14 years ago
jschenck

rrProfessor

La Vista, NE.

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check the temp of the servo right after landing - if it's HOT, something is wrong.
I fly one of my raptors with a 401 mated to a Hitec HS525 running 70% gain. flies fine.
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07-18-2006 12:14 PM  14 years ago
Learn to Fly

rrKey Veteran

Yalesville Connecticut

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Make sure you are getting full throw from your slider too.
Jeff
Believe nothing you hear, and half of what you see...
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07-18-2006 11:20 PM  14 years ago
Wemo

rrApprentice

Hampton Roads, VA

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Airtronics 94758Z on tail....Awesome! And can hold 6V."How high do they go? Are those things hard too fly? How much do they cost?
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