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HelicopterRadio - Futaba FASST › change S3470sv parameter through S-link software
05-25-2017 12:41 PM  88 days agoPost 1
lijin

Heliman

manchester, UK

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I find s3470sv is designed for cars but the speed and torque is also good for heli with cgy750. the most important thing is this servo is within reasonable price range as compared with bls272sv. I bought 3 this servo and now I am trying to use the s-link software to trim the parameter so it will suit the heli.

Above is the original setting. I find that if the stop mode is "free", it won't work with R7008sb. You shall change it to "hold". And you can also change the deadband to very small amount and I find from one Futaba Company leaflet that it can be set as small as 0.11. It means even you move the stick very little amount, the servo will react and the movement is very smooth which I think is very good for heli. The problem is that the servo may make louder noises and it becomes hotter. I also tried to change the boost mode to "on" and the boost to 40, this makes the servo's movement seem quicker and also hotter. The speed control can also be set to a quicker one such as 0.08. But this makes the servo noisy and sometime shake.

Now I plan to set the deadband to 0.20 which is the same as the bls272. But I am not sure about the boost, maybe 20 is enough. Anyone has tried the s-link before and any good suggestion?

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05-25-2017 01:19 PM  88 days agoPost 2
Dr.Ben

rrMaster

Richmond, VA, USA

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Experiment as you like, but make sure your model is smooth. Futaba incorporates different vibration protection and uses different component selection in the heli servos. The motors in the servos are also vastly different. As you noted, simply matching parameters doesn't always work functionally as it does theoretically.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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05-25-2017 02:14 PM  88 days agoPost 3
lijin

Heliman

manchester, UK

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Yes, I know the heli servos have vibration protection. The 3470 is designed for cars and this also needs good vibration protection so I think this is not a problem. Now I use deadband 0.20 and boost 20. I do not use speed control cos I can not know the speed is really quicker than default plus it becomes hotter. Do you think that speed can be set quicker than default?

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05-25-2017 04:01 PM  88 days agoPost 4
Four Stroker

Elite Veteran

Atlanta

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To add to what Ben said, the parameters will not mean the same thing with different servo mechanics.

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05-25-2017 05:22 PM  87 days agoPost 5
Dr.Ben

rrMaster

Richmond, VA, USA

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lilin,

RE the vibration protection, the factory does NOT use the same vibration protection in the car servos even though in principle car servos live a hard life too. We have made direct inquiries with Futaba about this and they have told us about the differing vibration provisions.

I would be very, very careful about tuning anything on the default parameters that would manifest as the motor working harder. A three pole cored motor is vastly different animal in terms of durability and efficiency than a BLS or even coreless motor. Early on I thought it would be really cool to take one of those monster airplane servos like the BLS177 and simply overwrite the BLS272SV parameters into it. Only problem is it doesn't work like talking. It'll buzz and hum. There is more to the way those parameters are optimized for the servo than just the application. They take into account other things like servo gear train ratio and probably amplifier design too.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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05-26-2017 03:22 AM  87 days agoPost 6
lijin

Heliman

manchester, UK

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Hi, Ben, Thanks for the information.
The reason why I think of changing the parameter is that I got a futaba compnay products leaflet called power transfer 2017 which is published in China. And in this booklet, the page of the car servos indicates that the parameter can be tuned for better performance and sveral examples are presented for tuning, such as changing the deadband and the boost. It seems this is the factory recommendation.
Also, 10 years ago I used 9001 cheap servos for my heli and had a lot of fun playing with them. SO I am sure 3 pole is ok for sport flying. Plus I have other 6 helis, would only fly this heli a few times a year and the working time would be very short so i dont't have to worry about the durability.
Now I only change the deadband to 0.20 and no hum and buzz are made and the servos are not hot. It is smoother than default and this is worth the price of 40$ I paid.

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05-26-2017 04:07 AM  87 days agoPost 7
Dr.Ben

rrMaster

Richmond, VA, USA

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K, but don't make judgments about​ operating temp until post flight when the servos have been driven hard by the gyro. I would also measure capacity used per flight pre and post tweaking because that more than anything tells what the servos are doing.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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05-26-2017 03:32 PM  87 days agoPost 8
Four Stroker

Elite Veteran

Atlanta

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Our local experience is that a 3P motor will only last maybe 50 flights in a Raptor 30. In FBL heli I could see them failing in 10 flights. But hey, try it.

The 9001 is a coreless motor servo with 2 ball bearings.

Servos are not virtual or s/w defined. You can't make a silk purse out of a sows ear by changing the s/w. But the parameters are there for you to play with. Go for it.

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05-29-2017 01:59 AM  84 days agoPost 9
gwright

Veteran

Champaign Il

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First, I would echo what others are saying, those are car servos and futaba does not recommend them for helis. With that being said, I use those exact servos with a cgy750 in both a 600 and 700 helicopter (synergy E5's, stretched). They have been reliable for a couple years. All stock settings, no changes at all in the parameters as you are suggesting. They've worked well for me, but Use them at your own risk, they are not heli servos.

Gary Wright

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05-29-2017 08:36 PM  83 days agoPost 10
Four Stroker

Elite Veteran

Atlanta

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" All stock settings, no changes at all in the parameters as you are suggesting. "

Yeah, the parameters more or less go with the mechanics - motor and gear ratio. Most of the parameters are really of no interest to the end modeler.

Lifespan is the only issue. Don't set the FBL gains too high !

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