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RC Radios, Transmitters, Receivers, Servos, gyros Discussion all about rc radios, transmitters, receivers, servos, etc.

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Old 02-14-2012, 09:23 AM   #1
mustang71
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Default Servo Arm - HiTec 65MG

Hi, I have used the Hitec 65MG servos in one of my models but I need to get more control surface movement so I am looking for a larger servo arm.

I have tried a number of aftermarket servo arms but the sizes are either too small or too large.

Has anyone found suitable servo arms for this servo, it seems the metal gearing has a larger than normal output shaft.

Thanks

Andy
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Old 02-14-2012, 04:12 PM   #2
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That uses what HiTec calls the B1 arms.
Have you tried these Dubro?
http://servocity.com/html/dubro_micro_arms_.html

fly
If you're going to learn to fly them, you have to learn to fix them.
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Old 02-15-2012, 07:32 AM   #3
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Default typo

Originally Posted by mustang71 View Post
Hi, I have used the Hitec 65MG servos in one of my models but I need to get more control surface movement so I am looking for a larger servo arm. I have tried a number of aftermarket servo arms but the sizes are either too small or too large.Has anyone found suitable servo arms for this servo, it seems the metal gearing has a larger than normal output shaft.Thanks Andy
Be carefull, using longer servo arms results in substantially less force (reverse crowbar effect)
and easier stripping of gear train.
Check that the geometry is correct, as use of excessive EPA does not help either.
In need, use appropriate Hitec horn with CF or Alloy extension:

. Servo - FAQ - Throw, 100% Tx setting is best, 125% is mechanically poor

. Servo - Horn Arm Spline Count and Inter Brand Compatibility refer HS-65 Horns & charta.

. Servo - Horn Arm Extension - DIY Alloy, FRP, CF & Nylon

much more under "Radio Systems, Accessories, Alterations and FAQ." at:
Alan's Hobby, Model & RC FAQ Web Links

Alan T.
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Old 02-15-2012, 08:19 AM   #4
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Many thanks for the info, really appreciated, will look at the Dubro Arms today, the red will also match the model.

Cheers

Andy
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Old 02-15-2012, 03:33 PM   #5
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Default

Meaning is clear but the text is not quite true; the torgue is not changed--it is a constant for any particular servo. However, the force exerted by the arm is lower, the longer the arm, the less the force exerted at it's end.
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Old 02-15-2012, 06:14 PM   #6
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Originally Posted by Rodneh View Post
Meaning is clear but the text is not quite true; the torgue is not changed--it is a constant for any particular servo. However, the force exerted by the arm is lower, the longer the arm, the less the force exerted at it's end.
Quite correct, a late night typo, now corrected.
Thank you

Alan T.
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Old 02-21-2012, 07:08 AM   #7
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dubro sells them.
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