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01-13-2011 07:47 AM  7 years agoPost 1
Switch_639

rrApprentice

Port Elizabeth, South-Africa

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I have a JR 770T gyro... want to use a S9251 Futaba servo... they guy wanting to sell to me is worried about compatibility issues... according to me a servo is a servo... can it work? safe to buy?

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01-13-2011 08:16 AM  7 years agoPost 2
xxcysxx

rrKey Veteran

Baltimore, MD - USA

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it will not work!
futaba s9251 are narrow pulse servos and the jr 770t gyros does not support narrow pulse.

all jr gyro does not support narrow pulse. but every other gyro brand does!
narrow pulse, or 760us pulse width, is a futaba proprietary gimmiks so you have to use their high speed servo with their gyro. but other gyro manufacture have caught on, and are supporting this narrow pulse feature too.

Tam

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01-13-2011 01:07 PM  7 years agoPost 3
BarracudaHockey

rrMaster

Jacksonville FL

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Tam is correct, no way to make that combo work

Andy
AMA 77227
http://www.jaxrc.com

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01-13-2011 07:20 PM  7 years agoPost 4
Switch_639

rrApprentice

Port Elizabeth, South-Africa

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there any cheap options out there? purchased a cheap second hand raptor titan 50... it has this gyro but normal DS820 JR servo which is slow... dont want to spend much as I can sell it for more than what I payed for, so dont want to spend money on it

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01-13-2011 07:28 PM  7 years agoPost 5
Switch_639

rrApprentice

Port Elizabeth, South-Africa

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Align DS510 Servo ?

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01-13-2011 07:35 PM  7 years agoPost 6
Dr.Don

rrVeteran

Cedar Park, TX -- USA

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Fut 9253 or 9254. Used they run $40-60.

Dr.Don

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01-13-2011 08:01 PM  7 years agoPost 7
Switch_639

rrApprentice

Port Elizabeth, South-Africa

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so they are not narrow pulse servos?

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01-13-2011 08:17 PM  7 years agoPost 8
Dr.Don

rrVeteran

Cedar Park, TX -- USA

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No. 9253 and 9254 are designed as fast tail servos using standard pulse width.

Dr.Don

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01-13-2011 10:11 PM  7 years agoPost 9
xxcysxx

rrKey Veteran

Baltimore, MD - USA

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Tam is correct, no way to make that combo work
BarracudaHockey,

actually, there's a way.

there is this module that will convert wide pulse 1520us to narrow pulse 760us for those that want to use ordinary gyro with narrow pulse servo. you plug this module in between your gyro and servo. i dont know how reliable it is, but reviews have said they work.

http://www.hobbyking.com/hobbyking/...?idProduct=8952

Tam

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01-14-2011 07:54 AM  7 years agoPost 10
Switch_639

rrApprentice

Port Elizabeth, South-Africa

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so the 9251 is a wide pulse not narrow pulse? cause input on that adapter is 1520 and output is 760...

edit: ok no I missunderstood... JR wont accept narrow pulse servos... so this adapter wont work for my application...

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01-14-2011 01:29 PM  7 years agoPost 11
Dr.Ben

rrMaster

Richmond, VA, USA

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The 9251 is a NARROW pulse servo, 760 uS.

Tread carefully with HK proprietary electronics regardless of what the reviews say.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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01-14-2011 01:48 PM  7 years agoPost 12
Switch_639

rrApprentice

Port Elizabeth, South-Africa

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thanks for concern... wont work anyway, cause I need wide... the adaptor switches wide to narrow not narrow to wide...

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01-14-2011 01:53 PM  7 years agoPost 13
BarracudaHockey

rrMaster

Jacksonville FL

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The 770 is standard (wide)pulse. The 9251 (and 9256, and BLS251) are narrow pulse.

Using that thing is up to you, but it is what you need. I didn't mention it for the reason Ben stated

Andy
AMA 77227
http://www.jaxrc.com

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01-14-2011 02:09 PM  7 years agoPost 14
Switch_639

rrApprentice

Port Elizabeth, South-Africa

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thanks for info guys... but its not worth it... it will take 2weeks to get to SA anyway... by that time I will have a wide pulse servo already...

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