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Old Dec 09, 2012, 05:49 AM
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Question
digital servo

Hi all was wondering if you can use a hitec 5755hs digital servo for a sail winch and what drum would fit ? has anyone had any experience with doing this ?
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Old Dec 09, 2012, 08:36 AM
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Blackpool, Lancs
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If it's a lot like this - http://www.servocity.com/html/hs-5755mg_servo.html
it wouldn't use a drum. Just fit an extension to the horn supplied to make it the right length to give the throw required.
Is there a pressing need for a digital servo as opposed to a normal heavy duty one?
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Old Dec 09, 2012, 08:38 AM
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That servo would normally be used as an arm winch, programmed for 180 degrees rotation. It can be modified for continuous rotation and a drum added, but why do that extra work?

The drum dia will depend upon the length of sheet line that you need to move, and the number of turns you want, More turns allows a smaller drum and more torque, but increases travel time.

Note that the servo uses the large 'D' size spline.

You can calculate the length of main sheet to be moved by the winch. Assume that the boom going from close hauled to full out to the shrouds, creates a 90 degree angle, then the length of the sheet line is the hypotenuse, and the base and side are the distance from the goose neck to the main boom attachment point - call it L.

the diameter of the drum is square root of (L squared*2) divided by Pi- divided by number of revolutions desired.

For example, Gooseneck to main sheet attach point L = 200mm, Three revolutions required

L squared (200*200) = 40000 times 2 = 80000

Length of main sheet movement is Sq root of 80000 = 282.8mm

Divide by 3.14 =90

Divide by 3 revolutions = 30mm

So the diameter of the drum is 30mm


John
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Last edited by hiljoball; Dec 09, 2012 at 10:22 AM.
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Old Dec 09, 2012, 03:11 PM
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sounds very complicated
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Old Dec 09, 2012, 05:31 PM
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Have a look at the" Drum for Hitec Sail Servo 67F" by Sailsetc
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Old Dec 10, 2012, 02:54 AM
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Originally Posted by darynxbcoupe View Post
sounds very complicated
If it was simple, everybody would have one.
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Old Dec 10, 2012, 08:26 AM
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I have a HS-5755 in an IOM, as a sailwinch. It is not a drum, but an arm about 2.75" long. It works fine. Let me know if you want photos
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Old Dec 10, 2012, 03:10 PM
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Originally Posted by hew565 View Post
I have a HS-5755 in an IOM, as a sailwinch. It is not a drum, but an arm about 2.75" long. It works fine. Let me know if you want photos
thanks but i dont have the room i think i might get a rmg thanks all
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Old Dec 10, 2012, 03:39 PM
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RMG sailwinch is bulky, heavy and expensive if that matters.
It is also FAST and STRONG - watch you dont fold the boat in half.....
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Old Dec 11, 2012, 12:18 AM
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Wrong quote
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Old Dec 11, 2012, 12:19 AM
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Perth Western Australia
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Quote:
Originally Posted by darynxbcoupe View Post
thanks but i dont have the room i think i might get a rmg thanks all
Darryn,

Whats the winch going into?
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Old Dec 11, 2012, 01:11 AM
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Darryn,

Whats the winch going into?
A tri i just built i had a cheap one from hk it worked great till the other day it just stopped working and i have read that they dont last
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Old Dec 11, 2012, 12:12 PM
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Is that a water bottle on top?
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Old Dec 11, 2012, 03:29 PM
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Is that a water bottle on top?
yep so when it tips it doesnt go right over in the process of making something nicer
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