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Author Topic: Winch servo question  (Read 2439 times)

gowansg

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Winch servo question
« on: October 30, 2013, 09:28:05 pm »

I'm just starting out with an R/C sailboat.  I have a Futaba "Attack" 2 Channel  2 Servo R/C kit but want to use it in a 72"sailboat.  I think I will need a winch to control the sails instead of the servos with arms. They just can't be strong enough.   The sails are from a Santa Barbara class boat.  What winch power would I probably need and would it plug into the same plug that the "arm" servo used?  What do I need to know that I don't even know to ask?
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More Coffee

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Re: Winch servo question
« Reply #1 on: October 31, 2013, 03:21:11 am »

You need a servo winch :-))
 
Essentially its a continuously rotating servo.using pullies to move your sail
http://www.hobbyking.com/hobbyking/store/__18974__sail_winch_servo_13kg_0_7sec_360deg_55g.html
 
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malcolmfrary

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Re: Winch servo question
« Reply #2 on: October 31, 2013, 10:01:37 am »

The one in the link is just a single turn - most sailwinches do several turns (3.5 is common).  For a large boat like yours I would suggest something with more travel. 
If you want a proportional one, shop-bought is the way to go, but the bigger and stronger they get, generally so do they cost more.  Some high end ones do need their own higher voltage, heavy supply, some of these contain a BEC (much as in many ESCs) to supply the radio and other servos. 
Making a winch by modifying a standard servo is easy enough, but lacks the speed of a bigger, purpose built unit.
A powerful arm is simplest to rig, but does need very careful mounting and room for the arm to swing.  A drum setup traditionally is more complex because of the need to avoid tangles with slack line.  Mounting is easier because the pull is always in just one direction.  The new breed of winches with captive drum technology are simplest to fit and rig, and are quite compact as well, but do need the right kind of line to work properly.
I've recently been using one of these - http://www.componentshop.co.uk/45g-sail-winch-servo-4-turns-end-to-end-travel.html- 15" of travel and seems to work well, but my boat is smaller than yours.

Post edited to get rid of annoying font size change
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JayDee

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Re: Winch servo question
« Reply #3 on: October 31, 2013, 11:14:42 am »

Hello,

 For a boat of that size there is only one winch which will do the job properly, AND keep on doing it for years - -a RMG Winch.
The link to the website is  - - -   https://www.rmgsailwinch.com.au
My J Class Endeavour has one fitted and it performs very well, the winch is well inside its power when moving the sails.
The winch can be programmed to suit the users requirements and is well engineered.

John.
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