[NSRCA-discussion] Futaba S9155 Hi Torque servos

Tue Jul 11 05:32:06 AKDT 2006

The 9152 is my favorite rudder servo, but I was concerned on weight so I
went with the 9155. Flying the two Aggressors back to back, I decided the
fault of the 9152 setup was too tight rudder cables which made the rudder
very sensitive around neutral regardless of how much expo was used (if I
didn't fly for a while, the rudder inputs would really show).  Flying the
9155, the rudder was too soft - however, loved the seemless rudder inputs
around neutral it had over the 9152.  To get them to match, I moved the 9155
setup control horns out to the 7/8" mark, and used the wheel like I
mentioned previously.  On the 9152 setup, I moved the control horns in to
about 5/8" from the control surface and loosened the cables 1 turn each side
- still using the large horn the 9152 servo comes with.  The 9152 plane
flies with a little less actual throw than the 9155 setup.  With the 9155,
left rudder is full-swing (35 deg) for all flight barring snaps, and Right
rudder is about 30 deg for normal flight, 35 spin/stall turn. (snaps 30 deg
both sides).  Now, I can fly both planes back to back and it is best of both
worlds - plenty of torque, nice suppleness.  In retrospect, you don't need
everything the 9152 offers - but you need to get EVERYTHIING out of the 9155
setup to get the power needed for P/F07.  I think it's a valid comparison as
both planes are identical aerodynamically.

Thanks,
Jim W.

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of ppennisi
Sent: Tuesday, July 11, 2006 9:10 AM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Futaba S9155 Hi Torque servos

Hi Jim,

Thanks for the response (Chad as well). I hadn't forgotten about the
response you sent some time ago about the 9152 servo. The size of the unit
put me of a little due to the way I have the current servo mounted. 

The 9155 is more or less the same dimensions as the S9151 which I would like
to replace. 

The size of the rudder on the Impact I am currently flying is quite large
and I do believe I get a bit of blow back flying in wind as speed tends to
be higher. I always feel I am running out of rudder in some of the roller
manoeuvrers.

Thanks again,

Peter.

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jim Woodward
Sent: Tuesday, 11 July 2006 10:59 PM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Futaba S9155 Hi Torque servos

Hi Peter,

I'm using this same servo on rudder, 6.0V regulator, 2400 Li-ion - zero
problems.  I use a long control horn on the rudder (cable attach point is
7/8" from surface of rudder on each side), and a Futaba large servo wheel
with the holes drilled about 1/8" inside the standard wheel holes.  With
this setup, the rolling loop/integration stuff is easy and nice.  Total
rudder travel on high rate is 35 degrees, ATV/AFR is high too.  Rudder is
very smooth and supple, but with plenty of power too.  I use -90% expo on
the 9WCII.

Thanks,
Jim W.

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of ppennisi
Sent: Tuesday, July 11, 2006 8:34 AM
To: 'NSRCA Mailing List'
Subject: [NSRCA-discussion] Futaba S9155 Hi Torque servos

I am thinking of purchasing some of the new Futaba S9155 servos for rudder
use on F3A models. Information taken from Tower's website state that it
should only be used in 6 volt NiCad powered systems.

Does anyone see any problems using this servo in a regulated 5.6 volt
environment using a Duralite regulator and 2 cell 2350 mah Lithium Ion
supply.  

Here is the information taken from their site

This is the Futaba S9155 Digital High Torque Metal Gear Servo.
                           with J Connector.
                      Designed for aircraft applications
            This servo requires high-current draw from batteries.
                         Use 6V NiCd batteries only.

FEATURES: Coreless motor, see COMMENTS
          Digitally enhanced microprocessors cut in half the response time
            from transmitter input to servo reaction
          Center of case is metal
          One year warranty

INCLUDES: One S9155 Digital High Torque Servo with J Connector
          Round servo wheel 1.8" (45mm) diameter
          Four point servo wheel 1.5" (38.5mm) diameter
          Six point servo wheel 1.2" (32mm) diameter
          Four rubber grommets
          Four metal eyelets
          Four 2x11mm mounting screws
          3x8mm horn set screw

SPECS:    Speed:        0.13 sec/60 deg @ 6.0V
          Torque:       192 oz-in @ 6.0V
          Length:       1.57"  (40mm)
          Width:        0.79"  (20mm)
          Height:       1.44"  (36mm)
          Weight:       2.15oz (61g)
          Power Supply: 6V required

COMMENTS: S9155 Digital Servo Precautions,
           -It is best to avoid long leads and Y-harnesses especially with
            standard grade wires. If problems are encountered, consider
using
            heavy duty wire such as Futaba's Heavy Duty Series or Hobbico's
            Pro Series, minimizing lead lengths, and/or removing
Y-harnesses.
           -Current Drain: This digital servo is specially designed for
high-
            torque or high-speed, therefore very high current drain is
normal
            at startup. For ultimate performance when using this servo
please
            review the following points.
              1. Radio systems with the Battery Fail Safe function have a
                 higher cut-off voltage setting which will cause shorter
                 operation time.
              2. When installing the servo, please check pushrod linkage to
                 make sure there is no binding in order to prevent excessive
                 power consumption and decrease the life of the motor and
                 battery.

         A note on Coreless motors: conventional servo motors have a steel
           core armature wrapped with wire that spins inside the magnets. In
           a Coreless design, the armature uses a thin wire mesh that forms
a
           cup that spins around the outside of the magnet eliminating the
           heavy steel core. This design results in smoother operation and
           faster response time.

         This digital servo cannot be used with any AM transmitters
including
           the following Futaba models as the servo neutral signal is:
1310us.
           CONQUEST AM, FG Series (T4FG, T5FGK,T6FG, T6FGK, T7FGK), New
Terra-
           top, T3EGX, T3PGE, T2NL, T2LGX, T2FR, T2PK series.

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