[NSRCA-discussion] Futaba S9155 Hi Torque servos
Chad Northeast
chadnortheast at shaw.ca
Tue Jul 11 06:18:57 AKDT 2006
Peter
One thing I found with the more powerful rudder models was that too large of control arm on the rudder servo made it very difficult to get the right feel. I run my stuff no where close to 1:1 widths servo to rudder horn, as I have found it far too sensitive and difficult to manage when setup like that.
Chad
----- Original Message -----
From: Peter Pennisi <pentagon.systems at bigpond.com>
Date: Tuesday, July 11, 2006 8:09 am
Subject: Re: [NSRCA-discussion] Futaba S9155 Hi Torque servos
> Jim,
>
> Thanks for the detail. You have identified a number of valid
> points in your
> email which I need to investigate further on my current model.
>
> I must admit that I have had a struggle trying to get comfortable
> with the
> rudder on the Impact. My problem is that I cannot seem to get a
> consistentfeel through my control system especially through the 8
> pointer and the
> reverse knife edge. Some days I pull of some blinders and most
> other days I
> swear I will take up old-timers. I have tried all amounts of expo
> and have
> settled on -60% for most flight modes. My cables are fairly tight
> so that
> might be worth a try. My control setups are such that the cables
> are exactly
> parallel between servo horn and rudder horn. The distance between
> them is
> 55mm to ensure my mechanical setup is symmetrical.
>
> I know you were flying an Impact for a while. How did you find
> snapping the
> model to the left? Snapping to the right is quite good, snapping
> to the left
> is a struggle - never had this problem with my previous model so I
> don'tthink it is me. Any suggestions!
>
> Thanks,
>
> Peter
>
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jim Woodward
> Sent: Tuesday, 11 July 2006 11:33 PM
> To: 'NSRCA Mailing List'
> Subject: Re: [NSRCA-discussion] Futaba S9155 Hi Torque servos
>
> 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
> ruddervery 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
> inputsaround 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
> planeflies 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
> [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
> rollermanoeuvrers.
>
> Thanks again,
>
> Peter.
>
>
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [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 -
> zeroproblems. 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.
> Totalrudder 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
> [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,
> considerusing
> heavy duty wire such as Futaba's Heavy Duty Series or
> Hobbico's Pro Series, minimizing lead lengths, and/or
> removingY-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.
>
>
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
>
More information about the NSRCA-discussion
mailing list