Hello,
It appears to me like Savox has interesting line of Digital servos that can feet for 2m Pattern ship.

for Ailerons: SC_1251MG (9kg, 0.09speed, Weight:44gram!!!)
for Rudder: SC_1258TG (12kg, 0.08speed, Weight:53gram!!!)
for Dual Elevator SH-1350 (4.6kg, 0.11speed, Weight:26gram!!!)

All Coreless, Digital with Dual ball bearing etc.... (Main shaft Futaba compatible...)

I have no experience with Savox products and I will appreciate any comments

Regards
Amram Leshed

Amran, do you have a link to a web page for these ? . . can't say I have heard of them.

Cheers, JB

http://www.savoxtech.com.tw/

here another one: http://www.cmldistribution.co.uk/new...iew=0000001223

Just Google it... it is all over...

Amram

That's exactly the setup I use in my SPARK, have used it for more than 150 flights and they run without any faults, the centering is SUPERB. So just go for it, I ended as runner up in Denmark.

Seen here for reasonable prices. (7,5DKK = 1 euro) www.hobby4u.dk

Joen

Amram made the same question in the Gas 3D Plane forum but did not receive any reply.

Thanks for the feedback I am mostly interested in the 20Kg / 0.15s with titanium gears can not remember the code, to be used in 35% gas model. I think I wll give them a try.

Spare parts is an issue as they are not available from many dealers.

Nikos

Hi Amram,

We're using these servos on our Venus II and Yohai is very happy with it. Very powerful and fast.
We also ordered one for the Spark project (rudder only).

Go for it.

Yoav

I use it for my Dexterous 170.It work fantasy,I think after use SAVOX Servo I will not use JR again!!

Zi-Chun Lin hi , where can get those SAVOX servo , i am interrested with the 20kg one , for my 100cc new plane ..... any dealer out
side TAIWAN ...? Will put in my new pattern plane as well if those servo works .

If you are interest please contact with me,I am savox dealer in Taiwan.
Here is the vedio I use SAVOX servo for my 100cc YAK
http://www.youtube.com/watch?v=vM93o5tCWp0

WOWw ..... that is what EXTREME- flying . . . . very nice !!

Wish i can fly like that .......[X(]

SAVOX on 35% aircraft.

[link]http://www.youtube.com/watch?v=H0K6ncxJMMw[/link]

How are people liking these servos? It's been a while since anything was posted. Good? Bad?

I know a really good flier. "No names" who didn't like them at all. They didn't center well after very few flights on an E. setup. Mike

Thanks, Just curious. I'm sticking with my Futaba's and JR's. I was wondering if these were really a first tier servo or just another second tier source.

Good move. I still have yet to find anything better than JR. I used Futaba last year but still like the JR's slightlybetter. Mike

Savox: 3 usec deadband. Not the best for Pattern. Recommend picking fromJR/Futaba/Airtronics instead.

I've been using them in my Wind S 110. They were good enough to make me start swapping out JR's for savox in other aircraft.

I have my concerns over centreing as mentioned above but I'm at about 80 flights and there's no sign of it yet.

Ed,
As deadband is an important criteria for selecting a servo, why is it so difficult to get the data on it?
It was easy to find the Savox deadband data. It is listed as part of the specification from the manufacturer. However finding the same data for most other servo manufacturers including JR and Futaba is vary difficult. They do not seem to publish the deadband data anywhere.  If there is such data, can you point me in the right direction to find it online?
Also are there any standards for measuring deadband? An integer number of microseconds seems unlikely to be the resolution of either the servo amp or the measuring equipment.
John<br type="_moz"/>

http://www.jrradios.com/Articles/HobbyWire.aspx

You will have to dig for the others. You can easily see the difference with a servo with less than 1 usec deadband. No perceptible difference between the better servos fromthe top 3.

From the HITEC website:
Q. What is servo deadband?<div id="main_text">A. Deadband reflects the time it takes for a servo to respond when stick movement is given. Standard servos have a deadband of around 8us and high performance servos have a deadband of 1~3us.

This would appear to be a definition of servo latency with values presented for deadband. Other sites seem to have some confusion between deadband and resolution.
Deadband is usually added to keep the servo from dithering as many JR digitals do and has nothing to do with the amount of time it takes for the servo to respond to input change. I still do not understand why this data has to be ferreted out from obscure posting on the manufacturers website. Since the results are so much better for JR as demonstrated in the link provided by Ed, why not sound off more? Certainly there is a lot of lowcost pressure on the top servo companies. It would appear that the problems with the budget servo being compared to the 821 had a lot more to do with backlash than deadband.

I would offer the following definitions.
Deadband: The servo input signal value change from steady-state required to initiate a change in output value
Accuracy: How closely the output signal matches the input signal once the deadband has been exceeded
Latency: The amount of time between a change in the input value and an initial change in the output value. Usually looked at from an overall system point of view, not just in a servo.

John</div>

Latency is a measurement of delay in response. Deadband is a measurement of positioning accuracy. You need both to be as low as possible so that the servo goes where you want it,when you want it there. Taking an extreme example, suppose you have a 1&mu;s servo with a 10 second latency. You set your trim resolution to 1 &mu;s on a 2048 resolution radio and bump the trim one time, take a sip of coffee, then observe the reaction as you are setting the cup down. If it's a 10 &mu;s deadband rating and zero latency instead, you can go grow the coffee beans, roast them, grind them, make a pot and it still will not have moved.

The JR demonstration with the pointer was a deadband demonstration, showing how 1 microsecond changes in digital trim movements resulted in a "zero deadband" response (not really, but within 1 &mu;s or less at least). TheJR servo picks up each 1 &mu;s change, whereas a servo with a higher deadband value will not. In other words, if you have 2 or3 &mu;s deadband, you can't accurately resolve a 1 &mu;s change. Anyway, I'm not trying to sell JR servos, but they had the demo video available. I looked around a bit for specs for the Airtronics and Futaba, and didn't find them, but it wasn't an exhastive search. Savox does publish their deadbandspec. The Savox looks like a fine servo, but it's just a question of how much accuracy you want, that's all.

Besides JR, I have used some Futaba and Airtronics digitals, andI have observed that theywill also resolve 1 &mu;s changes. That's all I was trying to say.</p>