Modifying a Sail Servo to 180 Degrees

[davidjohnbarlow@yahoo.co.uk]

The HiTec HS-765HB Sail Servo is recommended for the Fairwind 900 model
yacht but has only 90 degrees of rotation - see
http://fairwind900.home.comcast.net/Chris/Bakersfield%20Fairwind%20for%20Racing.pdf.
Adding two 2.2 k ohm resistors (red, red, red) to the red and green
potentiometer leads will give almost 180 degrees of rotation. To avoid
dismantling the servo and risking damage a servo stretcher can be
purchased or made on veroboard which connects between the receiver and
servo and has the same effect. These are rather expensive and I
couldn't find the circuit so I chose the dismantling option - see photo
at servomod.20m.com.

First apply electrical tape to both sides of the top half of the servo
to hold the gear mechanism together when the screws are removed. The
motor is held in place by a blob of glue. Heat may have to be applied
with a soldering iron to the motor contacts to soften the glue if the
board cannot be removed by force. The potentiometer is held together by
a screw and three lugs which have to be carefully bent upwards. Ensure
that it is replaced in the same position. Both ends of the red and
green wires are glued which makes removal difficult so I cut them in
the middle and soldered in the resistors. I covered the joints in heat
shrink and carefully flamed them although electrical tape would have
been easier and just as effective.

So why can't HiTec make this alteration and put a switch on the side
for both options?

[davidjohnbarlow@yahoo.co.uk]

The HiTec HS-765HB Sail Servo is recommended for the Fairwind 900 model
yacht but has only 90 degrees of rotation. Adding two 2.2 k ohm
resistors (red, red, red) to the red and green potentiometer leads will
give almost 180 degrees of rotation. To avoid dismantling the servo and
risking damage a servo stretcher can be purchased or made on veroboard
which connects between the receiver and servo and has the same effect.
These are rather expensive and I couldn't find the circuit so I chose
the dismantling option - see www.servomod.20m.com.

First apply electrical tape to both sides of the top half of the servo
to hold the gear mechanism together when the screws are removed. The
motor is held in place by a blob of glue. Heat may have to be applied
with a soldering iron to the motor contacts to soften the glue if the
board cannot be removed by force. The potentiometer is held together by
a screw and three lugs which have to be carefully bent upwards. Ensure
that it is replaced in the same position. Both ends of the red and
green wires are glued which makes removal difficult so I cut them in
the middle and soldered in the resistors. I covered the joints in heat
shrink and carefully flamed them although electrical tape would have
been easier and just as effective.

So why can't HiTec make this alteration and put a switch on the side
for both options?

[davidjohnbarlow@yahoo.co.uk]

The HiTec HS-765HB Sail Servo is recommended for the Fairwind 900 model
yacht but has only 90 degrees of rotation - see
http://fairwind900.home.comcast.net/Chris/Bakersfield%20Fairwind%20for%20Racing.pdf.
Adding two 2.2 k ohm resistors (red, red, red) to the red and green
potentiometer leads will give almost 180 degrees of rotation. To avoid
dismantling the servo and risking damage a servo stretcher can be
purchased or made on veroboard which connects between the receiver and
servo and has the same effect. These are rather expensive and I
couldn't find the circuit so I chose the dismantling option - see
www.servomod.20m.com.

First apply electrical tape to both sides of the top half of the servo
to hold the gear mechanism together when the screws are removed. The
motor is held in place by a blob of glue. Heat may have to be applied
with a soldering iron to the motor contacts to soften the glue if the
board cannot be removed by force. The potentiometer is held together by
a screw and three lugs which have to be carefully bent upwards. Ensure
that it is replaced in the same position. Both ends of the red and
green wires are glued which makes removal difficult so I cut them in
the middle and soldered in the resistors. I covered the joints in heat
shrink and carefully flamed them although electrical tape would have
been easier and just as effective.

So why can't HiTec make this alteration and put a switch on the side
for both options?

[davidjohnbarlow@yahoo.co.uk]

The Hitec HS-765HB Sail Servo is recommended for the Fairwind 900 model
yacht but has only 90 degrees of rotation - see
http://fairwind900.home.comcast.net/Chris/Bakersfield%20Fairwind%20for%20Racing.pdf.
Adding two 2.2 k ohm resistors (red, red, red) to the red and green
potentiometer leads will give almost 180 degrees of rotation. To avoid
dismantling the servo and risking damage a servo stretcher can be
purchased or made on veroboard which connects between the receiver and
servo and has the same effect. These are rather expensive and I
couldn't find the circuit so I chose the dismantling option - see
www.servomod.20m.com.

First apply electrical tape to both sides of the top half of the servo
to hold the gear mechanism together when the screws are removed. The
motor is held in place by a blob of glue. Heat may have to be applied
with a soldering iron to the motor contacts to soften the glue if the
board cannot be removed by force. The potentiometer is held together by
a screw and three lugs which have to be carefully bent upwards. Ensure
that it is replaced in the same position. Both ends of the red and
green wires are glued which makes removal difficult so I cut them in
the middle and soldered in the resistors. I covered the joints in heat
shrink and carefully flamed them although electrical tape would have
been easier and just as effective.

So why can't Hitec make this alteration and put a switch on the side
for both options?

[Doug McLaren]

In article <1165279225.019313.267890@79g2000cws.googlegroups.c om>,
<davidjohnbarlow@yahoo.co.uk> wrote:

| dismantling the servo and risking damage a servo stretcher can be
| purchased or made on veroboard which connects between the receiver and
| servo and has the same effect.

http://www.servocity.com/html/180o_servo_stretcher.html

$15

| So why can't Hitec make this alteration and put a switch on the side
| for both options?

They could, but is there enough demand for that?

In any event, Servo City sells this servo pre-modded for you if you
want that --

http://www.servocity.com/html/hs-765hb_sail_arm.html

And there are some other servos that offer 180 degree rotation out of
the box, and many digital servos can be programmed for 180 degree
rotation.



--
Doug McLaren, dougmc@frenzied.us
They say only the good die young. If it works the other way, I'm immortal.

[mikes025]

davidjohnbarlow@yahoo.co.uk;98 Wrote:
> The Hitec HS-765HB Sail Servo is recommended for the Fairwind 900 model
> yacht but has only 90 degrees of rotation - see
> http://tinyurl.com/2cele9.
> Adding two 2.2 k ohm resistors (red, red, red) to the red and green
> potentiometer leads will give almost 180 degrees of rotation. To avoid
> dismantling the servo and risking damage a servo stretcher can be
> purchased or made on veroboard which connects between the receiver and
> servo and has the same effect. These are rather expensive and I
> couldn't find the circuit so I chose the dismantling option - see
> www.servomod.20m.com.
>
> First apply electrical tape to both sides of the top half of the servo
> to hold the gear mechanism together when the screws are removed. The
> motor is held in place by a blob of glue. Heat may have to be applied
> with a soldering iron to the motor contacts to soften the glue if the
> board cannot be removed by force. The potentiometer is held together
> by
> a screw and three lugs which have to be carefully bent upwards. Ensure
> that it is replaced in the same position. Both ends of the red and
> green wires are glued which makes removal difficult so I cut them in
> the middle and soldered in the resistors. I covered the joints in heat
> shrink and carefully flamed them although electrical tape would have
> been easier and just as effective.
>
> So why can't Hitec make this alteration and put a switch on the side
> for both options?

Has anyone tryed to extend a servo to run a larger motor like a motor
on a gear box? Then you can build a larger sail winch.


--
mikes025
------------------------------------------------------------------------
mikes025's Profile: http://www.modelpowerboat.com/forum/member.php?userid=418
View this thread: http://www.modelpowerboat.com/forum/showthread.php?t=61

[A.T.]

The information supplied is not correct as the Hitec HS765HB sail arm servo
has 140 degrees of swing, much more than Futaba or other similar units and
does not need modification for any known Kyosho or similar RC yachts.
Full specifications are detailed at
http://www.acehobby.co.nz/ossb2/root/OSSBEC1/showitem.asp?PID=52316
Much more information on fitting sail servos, winches etc on my web page
under "Boats, Yachts, Submarines, Warship Combat and Nautical reviews" sub
section "Reviews, Plans, FAQ & Tips, Jet drive." and further modifications
to RC equipment under "Radio Systems, Accessories, Alterations and FAQ" sub
section "Servo & TX alterations, calculators, clonepacs, make an ESC or
winch, FAQ."
In need, email me direct for a full comparison spreadsheet on Hitec and
Futaba sail &winch servos.
As an aside, a number of competitive type sailors now use Hitec digital
servos which are much faster and much more powerful .The digital servos can
be individually programmed to move the swing required for each individual
boat and or transmitter which can be a simple 2 channel - no need for
complex transmitters.

Regards
Alan T.
Alan's Hobby Model & RC Web Links
http://homepages.ihug.co.nz/~atong

================================================== ====

"mikes025" <mikes025.2mb23b@no-mx.forums.yourdomain.com.au> wrote in message
news:mikes025.2mb23b@no-mx.forums.yourdomain.com.au...
>
> davidjohnbarlow@yahoo.co.uk;98 Wrote:
>> The Hitec HS-765HB Sail Servo is recommended for the Fairwind 900 model
>> yacht but has only 90 degrees of rotation - see
>> http://tinyurl.com/2cele9.
>> Adding two 2.2 k ohm resistors (red, red, red) to the red and green
>> potentiometer leads will give almost 180 degrees of rotation. To avoid
>> dismantling the servo and risking damage a servo stretcher can be
>> purchased or made on veroboard which connects between the receiver and
>> servo and has the same effect. These are rather expensive and I
>> couldn't find the circuit so I chose the dismantling option - see
>> www.servomod.20m.com.
>>
>> First apply electrical tape to both sides of the top half of the servo
>> to hold the gear mechanism together when the screws are removed. The
>> motor is held in place by a blob of glue. Heat may have to be applied
>> with a soldering iron to the motor contacts to soften the glue if the
>> board cannot be removed by force. The potentiometer is held together
>> by
>> a screw and three lugs which have to be carefully bent upwards. Ensure
>> that it is replaced in the same position. Both ends of the red and
>> green wires are glued which makes removal difficult so I cut them in
>> the middle and soldered in the resistors. I covered the joints in heat
>> shrink and carefully flamed them although electrical tape would have
>> been easier and just as effective.
>>
>> So why can't Hitec make this alteration and put a switch on the side
>> for both options?
>
> Has anyone tryed to extend a servo to run a larger motor like a motor
> on a gear box? Then you can build a larger sail winch.
>
>
> --
> mikes025
> ------------------------------------------------------------------------
> mikes025's Profile:
> http://www.modelpowerboat.com/forum/member.php?userid=418
> View this thread: http://www.modelpowerboat.com/forum/showthread.php?t=61
>