[NSRCA-discussion] 4.8 volt Vs 6.0 volt

[Dean Pappas]

Hello Bill,
The 3151s are just barely adequate on 6V, based on the info at the Tower site.
At 4.8 V, the 43 oz-inches is decidedly weak for the large ailerons, and big rudder of the Quest.
Even if you push the large surfaces only a little bit, they still pose the same potential for
flutter, at high speed, against a Sport torque rated servo.
Even non-digitals in the 70+ oz-in neighborhood will be better suited.
You can still get a quantity discount on 9202s from Tower, and they'll deliver adequate torque on either 4 or 5 cells.
If you're looking to go digital (recommended) then the 3152s have beefier specs, though I just don't understand the $30 Tower price!
That's something of a bargain.

hope that helps,
Dean


Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com


-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Bill
Markovitz
Sent: Thursday, March 09, 2006 11:29 AM
To: nsrca-discussion at lists.nsrca.org
Subject: [NSRCA-discussion] 4.8 volt Vs 6.0 volt


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.

Thanks.............Bill       :)

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