Aileron servos

[David Lockhart]

Adam,

I think the difference is attributable to the speed - even 60 oz/in is 
pretty strong - unless you have huge ailerons with tons of throw (poor 
mechanical advantage).  I have run the 8417s on aileron and like them - 
but as you noted, they are a bit heavy.  I am currently running the 
9411s - a midsize servo - about 80 oz/in, .15 sec, 1.5 oz each (1.3 if 
converted to nylon gears).  Also, if you put the 8231 nylon geartrain 
in the 8417s, they will be almost .4 oz lighter, and the speed / torque 
will change from .10 / 80 to about .13 / 100.

FWIW - I've never found a servo that was too fast - I run all my JR 
stuff on unregulated 5 cell packs - which puts the 8417 down around 
0.08 sec.  Very fast!!

Regards,

Dave Lockhart
Team JR



----- Original Message -----
From: Adam Glatt <adam.g at sasktel.net>
Date: Thursday, May 22, 2003 9:37 am
Subject: Aileron servos

> I recently switched from a 60oz/inch, 0.22sec/60deg digital servos 
> in the ailerons (JR 3301) to 80oz/inch, 0.10sec/60deg digital 
> servos (JR 8417).  Also, the 8417 weighs a full ounce more than 
> the 3301, so I added two ounces of weight, and they cost quite a 
> bit more.
>  I noticed a small improvement in rolling response, but a large 
> improvement in snaps.  The plane will get up to full snapping 
> rotation speed much sooner (especially on the P-03 45deg up snap, 
> where the power is on and speed is high), and stop rotating much 
> sooner.  The difference is probably 15 degrees less rotation with 
> the 8417 after you end the snap inputs, and this makes it a lot 
> easier to stop the snap where you are supposed to.
> 
> That's my experience. I think the lesson is that, regardless of 
> weight, having servos with a speed of well under 0.2sec/60deg 
> makes a big improvement.
> 
> Also, looking at JR, Futaba, and Hobbico servo lineup, I see many 
> servos well under 0.2sec.
> 
> Adam Glatt
> (wishing someone had told him this before he bought the 3301s :)
> 

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