[NSRCA-discussion] Futaba Servos

[Robert L. Beaubien]

Cheaper NiMH cells have high internal resistance which causes the
voltage to drop under high current loads.  NiCads do not have this
problem.  NiMH are fine as long as you know the cells you are using can
handle the demand you are placing on them.

 

Good info on NiMH as it relates to R/C:
http://www.rcbatteryclinic.com/ni-mh.html 

 

- Robert Beaubien

- AMA #618061 / NCRCA #4121

-

 

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jay
Marshall
Sent: Friday, January 11, 2008 10:29 AM
To: chad at f3acanada.org; 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Futaba Servos

 

The servos are rated at 6 volts - no problem here. My question was why
the NiCd limitation. I suspect they want to avoid NiMh because of the
high initial current drain. LiPo shouldn't have this problem.

 

Jay Marshall 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Chad
Northeast
Sent: Friday, January 11, 2008 9:10 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Futaba Servos

 

Hi Jay

I ran those servos regulated to 6V, the 4.8 thing has to do with
unregulated Nicads as has been mentioned.  You can get a pretty high
voltage on a 6V pack.

If you regulate a 2s lipo you wont have any problems with those servos.
One of the pluses of a brushless is that is should be more tolerant of
higher voltages anyways, but I have not tried higher than that.  Maybe
some of Ed's new regs are in order so I can play around! :)

Chad

----- Original Message -----
From: Jay Marshall <lightfoot at sc.rr.com>
Date: Friday, January 11, 2008 6:08 am
Subject: [NSRCA-discussion] Futaba Servos
To: nsrca-discussion at lists.nsrca.org

> I am planning to use the new Futaba BLM 451 servos in my new 
> plane. I had
> also planned to use a 2S LiPo battery and Castle Creation's new 
> BEC for the
> system power. The servos, however, have a note on the box "Ni-Cd 
> Use Only"
> Does anyone know why? I can't find any reference to this spec on 
> the Futaba
> site (although I might have missed it).
> 
>  
> 
> Jay Marshall 
> 
>  
> 
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20080111/a5a26b7e/attachment.html