[NSRCA-discussion] 4.8 volt Vs 6.0 volt

[Archie Stafford]

I'm now flying Futaba's 9254 heli servo on the elevator of my Mantis.  This
is the same setup CPLR used in France.  Wow is it responsive.  It's only
50oz torque roughly, but I have flown both new FAI sequences as well as
Masters, and even tried to push it to see if it would have a problem, and
I've yet to experience any problems.  The speed is great at .06.  I would
say the 3151's would be adequate on aileron and elevator.  You might want a
little more on rudder, but they would work, you just wont have quite as
effective a rudder.  You might try a 3152 on the rudder and use the other
3151 for throttle.  

 

Arch Stafford

 

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ron Van Putte
Sent: Thursday, March 09, 2006 1:15 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] 4.8 volt Vs 6.0 volt

 

 

On Mar 9, 2006, at 10:28 AM, Bill Markovitz wrote:





Hi all..........I purchased a Quest and a Futaba 9CAF

at the WRAM show. The 9CAF comes with 3151 digital

servos rated at 4.3 oz/in. I would like to use these

servos with the 90 size Quest for competing in the

Intermediate class and won't be using it for 3D

flying. Are these servos adequate for this

application? If not, would going to 6 volts give me

the additonal torque that I need? How much more

torque would going to 6 volts give me? Are there any

known problems using an on-board 6 volt power supply? 

The 9CAF manual states that driving the servos with a

6 volt supply is an option.

 

You will get a lot of responses to this, which will cover the gamut. 

 

First, I believe you meant 43 in-oz torque. 

 

Second, for all but extreme aerobatics (like snap rolls) 43 in-oz servos
should be adequate. There will probably be responses that will say that you
need 80 - 100 in-oz torque servos.

 

Third, you may not be aware, but 30 years ago many of us were using Kraft
KPS-12 servos (smallest and lightest!) in .60 cu-in engine powered airplanes
weighing up to 8 pounds. The KPS-12 servo had a torque of 18 in-oz. Think
about that for a while.

 

Ron Van Putte

 

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