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Old Mar 24, 2003, 09:52 PM
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Kevin Murray's Avatar
USA, NC, Greenville
Joined Dec 1999
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What servos are in your Sp 400 sided pylon racer ?

So what is everyone useing ?
Are HS 55's enough ? HS 81's ?
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Old Mar 25, 2003, 07:43 AM
F5D father
Tuomas Pietinen's Avatar
Vantaa, Finland
Joined Mar 2001
441 Posts
55:s are fine. In the F5D planes I use Graupner / jr 2081 servos, 2 for aileron and 1 for elevator. In s400 plane 1 servo is enough for aileron.
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Old Mar 25, 2003, 12:06 PM
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SoarNeck's Avatar
Calgary, Alberta
Joined Nov 2001
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I like MX-50 HP's...great torque, the most precise servo in it's size IMHO, and $34.99 cdn at my local hobby store.

I use them on S400 racers, in my D-99 F5D racer, and in all my DLG's (must have about 25 by now).
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Old Mar 25, 2003, 03:15 PM
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Brum UK
Joined Jan 2001
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Tuomas, what is the differance between the 2081 and the 261 servo's? The 261 has very large holes in the output arm. I have been using some 141 servos, one seems to alter its centre position from the start to the end of the flight. It is over the battery and I suspect that as it warms up it may change some of the components values. Have you used the 1081 servos?

Mike
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Old Mar 26, 2003, 12:41 AM
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United States, MI, Commerce Charter Township
Joined Dec 2000
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I prefer HS-50's for my racers. Not only are they smaller and lighter than most other servos, they are odly enough, better suited to 400pylon than any other microservo on the market.

Don't get me wrong, I've used HS-60s, S80's and 90's, and JR241's with no problems, but the 50's work better. Since the output arms on the 50's are so short, you don't have to dial the endpoints on your radio down as far to keep the control throws small for a pylon racer. Not only does this negate a larger servo's torque advantage, but the resolution and centering are better this way.

HS50's also have a lower startup current than the cheaper imports-important if you run lots of cells or more than two servos.

Whatever you do, avoid the smallest GWS variant 6g servos. They are meant for foamies that fly "straight enough", and don't center worth a darn.

Dave
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Old Mar 26, 2003, 03:04 AM
F5D father
Tuomas Pietinen's Avatar
Vantaa, Finland
Joined Mar 2001
441 Posts
The JR 241 and Graupner 261 look the same. 2081 is different shape, more rectangular, and stronger. FOr me it centers best of all Ive tried.
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Old Mar 26, 2003, 11:54 AM
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Troy's Avatar
United States, CA, Lake Forest
Joined Feb 1999
6,004 Posts
Tuomas,
I got some of the new Graupner DS 281 digitals to play with for F5D. They should center well, don't you think
I think HS-55's are good bang for buck S400 servos but I've had longevity issues with their centering.
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Old Mar 26, 2003, 01:37 PM
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Calgary, AB, Canada
Joined Oct 2002
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Quote:
Originally posted by Troy
I got some of the new Graupner DS 281 digitals to play with for F5D. They should center well, don't you think

Troy, thats an interesting servo. Ive been wondering where there arent more micro digitals. Can you tell us more about it? I only found 1 tech spec link: http://www.rc-modellbau-discount.de/G5148.htm

- they show 2 torque values, 13 & 50 N-cm. I guess the higher is the (digital) holding power? Whats that in in-oz BTW?

- any idea how that power draw compares to similar analog servo's?

- 9 grams, thats right in there with the light stuff, impressive

- transit time of 0.16 sec, but for some reason they use a 40 deg reference angle. So does that mean 0.24 sec on an equivalent 60-deg basis? The MPI-MX-5-HP that Adam mentions are 0.08 sec/60 deg. ...not that snap roll recovery is a normal F5D event

-any idea if these are programmable & how?
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Old Mar 26, 2003, 08:16 PM
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Kevin Murray's Avatar
USA, NC, Greenville
Joined Dec 1999
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Quote:
Originally posted by ptxman

- transit time of 0.16 sec, but for some reason they use a 40 deg reference angle. So does that mean 0.24 sec on an equivalent 60-deg basis?
I think so.
The specs I saw in the most recent issue of MAN had the speed of over 0.2 listed. I ordered two anyway. I'll get a new 241 and test the power consumption head to head. (I'll do a HS-55 also)
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