[NSRCA-discussion] Futaba Servos

[Ed Alt]

Red is probably the best there is when it comes to this topic.

 

Ed

 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jay Marshall
Sent: Saturday, January 12, 2008 4:24 PM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Futaba Servos

 

What a great site for info on batteries. I just wish it had been kept
up-to-date on the latest battery and charger technologies.

 

Jay Marshall 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Robert L.
Beaubien
Sent: Friday, January 11, 2008 12:57 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Futaba Servos

 

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 
> 
>  
> 
> 

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