Digital Servos Buzzing???

[Sgt_BF_Gunner]

Hello All,

I installed 4 S9451's in my Raptor 50 Titan.

They all are buzzing. I tinkered with the linkages to make sure they are not binding at end points, etc. I even disconnected all linkages and they all still buzzed.

I have heard both schools of thought... 1. Buzzing is bad and means binding. or 2. Digital, coreless servos buzz, it is normal.

As I trust my fellow Helifreaks, what's the scoop???

Thanks,
Gary

[ferincr]

Well, I'm almost as new as I can be but according to what I'd hear I'd go for #2.
now the reason I jumped in is when I was about to buy my heli I did a little research on servos as I was trying to save a little on the first big dump of cash and I saw some ( I'm pretty sure they were 9451's) that they were a bit cheaper than the 9252's.
They were advertised as for cars with metal gears and I thought " great, metal gears, more torque and faster for less price!" then the more experienced people kind of steered me out of them (just because of the metal gears), so I'd like to know how you like them after a while.
My 9252's buzzed for a while and now they are pretty much silent, I think it has to do with the linkages all getting "run in".
My guess is if the people that steered me off the metal gears are right the 9451's should, (according with the theory that they buzz because they are continuously centering themselves) buzz more and more as the metal gears wear out (and apparently they tend to do that faster than plastic ones).
But, as I said before (and I guess they are new now, I'd like to know how you like them just to have another point of view.
Hope this helps somehow.

[BarracudaHockey]

They buzz, its cool.

[Sgt_BF_Gunner]

Thanks Fernando.

I did research as well. I purchased a 9CHPS and it came with the 9252's. I went with the 9451's instead... They were $75 vs. $79. As you saw they are faster and have more torque. What the bigger draw for me is that they will do 6 volt where as the 9252's will only do the 4.8.

On 6 volt they will do 120.8 torque and 0.10 for speed. That's goodness for heli's as far as I know.

As for the metal gears... My T-Rex 450SE has the Hitec Hs-65HB (Karbonite gears) when everyone says to go for the 65MG (metal gears). So not sure what to think about it.

I saw some reviews where pros were using the 9451's. Goal was performance, didn't really worry about the money part. Went for the GY611 gyro setup as well (even though the 401 would have probably been plenty).

So we'll see. I hope to have her off the ground this weekend. I'll let you know how I make out with these servos. I'm praying that they are good cause $300 is mucho dinero just to blow. :shock:

There is a 9451 thread here... This is what finally made me decide.
"What is wrong with the Futaba S9451?":
http://www.helifreak.com/viewtopic.php?t=14715&highlight=9451

Again, thanks for the feedback, I'm hoping they will eventually quite down.

Best Regards,
Gary

[Sgt_BF_Gunner]

Thanks Andy. Very noisey... I'm sure the OS .50 will drown it out. :D

[ferincr]

This is the thread I started some time ago in R/Cgroups (that was before I knew about HeliFreaks) and all the back and fore about them made me decide to go for the most standard ones.
http://www.rcgroups.com/forums/showthread.php?t=518219&highlight=9451

[Sgt_BF_Gunner]

Wanted my 6 volts... 9252's are 4.8.

Invested in the 9451's already anyway. Just trying to quiet them down.

I'll keep ya'll posted on life with the 9451.

[Tomas Ahl]

I concur with BarracudaHockey. Digitals buzz, it's normal. Every once in a while one of the servos' motors will center so that it goes silent, then i begin to worry until I wiggle the sticks and it gets buzzing again... :)

I saw some reviews where pros were using the 9451's. Goal was performance, didn't really worry about the money part. Went for the GY611 gyro setup as well (even though the 401 would have probably been plenty).
Pro means sponsored and thus not needing to worry about the cost of exchanging servos every once in a while. Possibly. Just a thought.

[BarracudaHockey]

If you are running a regulator then the 52's would have been fine.

What happens is as the voltage increases, the dead band decreases, digital servos already have a narrow dead band to begin with, if you are using a 5 cell pack without a regulator they will buzz worse than if you were running a 5.1 or 5.3 volt regulator, which IMO is all you really need, I doubt you'd be able to tell the difference between that and 6v in flight and your expensive equipment will last longer.