[NSRCA-discussion] Servos

[Stuart Chale]

Thanks 

Changing a servo gear to make weight?  Only something a pattern flyer would
do.

For the rest there's MasterCard!

 

Stu

 

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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of David
Lockhart
Sent: Wednesday, March 08, 2006 9:25 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Servos

 

Nylon has better wear properties and the geartrains can be produced with
tighter lash without risk of binding.  The only real reason I can see to use
metal gears is to increase strength without increasing volume - which is
needed when these servos are used in applications with high impact loads
(big IMAC style stuff and some of the glider stuff - mostly for "shock" at
landing as I understand it).

 

The "sa" is the nylon gear version - actually, to be accurate, all the
servos I listed use a metal pinion on the motor, three nylon intermediate
gears, and the final output gear is metal (to reduce flex in the output
shaft).  FWIW, depending on the servo, you can save 0.1+/- oz changing the
final output gear to nylon.

 

Dave

 

----- Original Message ----- 

From: Stuart Chale <mailto:schale at optonline.net>  

To: 'NSRCA Mailing List' <mailto:nsrca-discussion at lists.nsrca.org>  

Sent: Wednesday, March 08, 2006 9:14 PM

Subject: Re: [NSRCA-discussion] Servos

 

Thanks for the input.  The specs of the servos you picked do seem to fit
their use.

Why convert the metal gears to nylon on the elev servo?

What is the difference between SA and the regular versions. Is it just metal
vs nylon?

 

Stu

 


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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
DaveL322 at comcast.net
Sent: Wednesday, March 08, 2006 1:20 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Servos

 

Stu,

 

The JR servos will work with the Futaba RX, and you'll find quite a few guys
using JR servos with non JR RX/TX.

 

My preferred setup -

Ail - 2x9411sa

Ele - 1x8417sa (convert metal gears to nylon using 8231 gearset).

Rud - 1x8411sa

Thr - 1x3421sa

 

You can certainly find stronger servos that are of the same approximate
size/weight, but I've run them back to back with the above and on a 2M
pattern plane, more servo than the above is just more weight and expense.

 

Since the day of the analog 9101, pattern servos now are digital - I
wouldn't go with anything that is not digital.

 

Regards,

 

Dave Lockhart, Team JR

DaveL322 at comcast.net

 

 

-------------- Original message -------------- 
From: Stuart Chale <schale at optonline.net> 

 

Ok a basic question.  Which servos do you like to use on your 2M planes.  I
am looking for Futaba or Futaba compatible models.  The last quality servos
I bought were 9101's   Technology has advanced since I have been away and
the planes have gotten bigger :-)

 

Thanks,

Stuart C


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