JR 4721 servos - RC Groups
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Oct 18, 2017, 02:55 PM
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joseph1266's Avatar
Help!

JR 4721 servos


I am in the process of getting 6- 4721 servos and need arms for them. I have called Horizon, JR America and Servo City. I even called an old friend who has a large hobby shop. They either don't know or don't have arms for these servos. Does anyone out there either have or know where to get arms for these servos? Someone suggested I count splines, but these old eyes can't hang. Any help would be appreciated.

Thanks
Joe
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Oct 18, 2017, 03:25 PM
KV4PL, FAA 107 Certified
FloridaFlyBob's Avatar
Joe you might get a faster response if you ask your question over here

https://www.rcgroups.com/radios-135/
Oct 18, 2017, 04:03 PM
AndyKunz's Avatar
Are these standard JR arms? If so, you should be able to find them from just about anybody. If you want me to send you some, PM me your address.

Can you take a picture of the end so we can count the splines? Also, if you could put a micrometer on to measure the diameter what would help too.

Andy
Oct 18, 2017, 08:45 PM
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richard hanson's Avatar
They are std jrarms
I used those servos on my Dalotel oldies but goodies
Oct 18, 2017, 11:26 PM
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joseph1266's Avatar
Andy, I can't thank you enough for your offer. I need arms 1&1/2 inches long. I am trying to keep the geometry straight. If you have anything this long, I'm interested. Otherwise, keep on helping idiots like me out. You make this worthwhile. Again, Thanks. Joe
Oct 19, 2017, 04:51 AM
Registered User
DuBro has a package of heavy duty servo arms for JR splines

Should be available at your LHS
Oct 19, 2017, 08:00 AM
AndyKunz's Avatar
Quote:
Originally Posted by joseph1266
Andy, I can't thank you enough for your offer. I need arms 1&1/2 inches long. I am trying to keep the geometry straight. If you have anything this long, I'm interested. Otherwise, keep on helping idiots like me out. You make this worthwhile. Again, Thanks. Joe
I don't. The Dubro arms are good. That long you probably need metal.

All I have are the standard ones that come with servos.

Andy
Oct 19, 2017, 01:43 PM
Registered User
joseph1266's Avatar
Hugh P, thanks but I looked at them. I'd have to buy three packs to get what I want. I'm not trying to be cheap, but I still want value. I can't thank you all enough for the input. Seller is going to help, so I think I got this. I am going to send him SWB arms for his trouble. Again Thanks for your input, couldn't do this with out you all

Joe


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