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Old Jan 22, 2013, 12:10 PM
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Chris Currie's Avatar
Ayrshire, Scotland
Joined Nov 2007
80 Posts
Help!
AM servos

Hi all,

I am looking for 4 servos for my own design biplane. I am currently running 4 x JR DS318(188) in my Arrow V5 which are superb. Really fast and accurate.

I have noticed dymond do a fast version of the D47 and wondered if anyone has any experience. They show 1.2kg torque and 0.08 sec. Just wanted to know if they centre well and are as good as the spec suggests. At 0.33kg more torque, 1.3g lighter and 5 cheaper than the JR it seems a good servo.

Looking for something to plug straight into Rx rather than solder up to ESC if possible.

I'd appreciate any help on this.
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Old Jan 22, 2013, 01:15 PM
Professional idiot
Hampshire, UK
Joined Jun 2002
3,119 Posts
The fast D47 is the same as the slow one with different gearing. More speed, less torque. Equal in quality of movement though.

In fact quite a few people are flying the fast ones in normal F3P-AP. I actually have 3 of them on my Helix. A lot of use and only now am I getting some jitter on the elevator (a lot of hours on them).

Dave
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Old Jan 22, 2013, 02:00 PM
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Chris Currie's Avatar
Ayrshire, Scotland
Joined Nov 2007
80 Posts
Thanks Dave, good to know. They are out of stock at the minute, might email Paul to see when they are back. Would like to get the plane flown next week.
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Old Jan 22, 2013, 03:40 PM
"Free" in Christ!
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United States, CA, SF
Joined Jan 2012
851 Posts
I have been using one dymond 4.7s on my minis and it works great! good centering, no jittering, fast.

not sure if you want to use them on an AM plane though? I would go with 3 Futaba s3114 servos.(only about 5 grams more)

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Old Jan 22, 2013, 10:10 PM
Professional idiot
Hampshire, UK
Joined Jun 2002
3,119 Posts
I'd give Paul a ring as the numbers don't add up. This servo is rebadged by a number of people (Dymond just another US shop).

Yellow hardware was slow one and red hardware fast one. I actually use the LSX065HS and LSX110 Paul sells but the torque figures don't match those of the Dymond D47 & D47S he also sells.

Dave
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Old Jan 23, 2013, 08:42 AM
Team JR
Medford, NJ
Joined Jan 2004
317 Posts
Chris,

I recently did some bench testing on the D47s, D47, JR 188 (318), and JR290G. With my 12X set for 1us trim increments (smallest available), the 188 consistently followed every 1-2 clicks of trim....the D47s followed every 1-4 clicks of trim. With the endpoints set for 100% (default, max is 150%), the D47s was moving +/-35 degrees while the 188 was moving +/-42 degrees. The extra movement of the 188 effectively increases the trim resolution, and is nice for extra throw on 3D stuff. The D47 behaves the same as the D47s (D47 was actually less throw....+/-30 degrees). The JR 290G was by far the best...moving with every trim click, +/- 40 degrees, and very tight geartrain.

Regards,

Dave
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Old Jan 23, 2013, 01:30 PM
srl
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Sydney New South Wales Aust
Joined Mar 2007
150 Posts
Here is a youtube I did some time ago.
servo_test.mp4 (2 min 17 sec)

As a user of both I dont think the Dymonds have as much torque as the JR's but they have a very low profile and are high voltage.
srl
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Last edited by srl; Jan 24, 2013 at 01:37 PM.
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Old Jan 23, 2013, 02:04 PM
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Chris Currie's Avatar
Ayrshire, Scotland
Joined Nov 2007
80 Posts
Some great info, thanks alot. I think I'll stick with the JR's for now, managed to find 4 of the analog S185/E316 in my spares box today so will just fly it with them for now. I like the compactness of the dymonds but it sounds like the JR is best for my needs, may have to purchase more digis soon. :-)

Got the main foam parts cut out today so hoping to get it built for next weeks indoor. Just hope it flies well!

Thanks again

Chris

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