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    HiTec HS-785HB Sail Servo.
    by John B πŸ‡¬πŸ‡§ ( Able Seaman)
    πŸ“£










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    12 Posts 11 Replies 0 Photos 25 Likes
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    John B
    Able Seaman
    πŸ“ HiTec HS-785HB Sail Servo.
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 1 hour ago
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    Hi Martin,

    Many thanks for your input.

    Cheers
    John
    1
    John B
    Able Seaman
    πŸ“ HiTec HS-785HB Sail Servo.
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 1 hour ago
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    Many thanks for your input. I think I can get on with the project now.

    Cheers
    John
    1
    John B
    Able Seaman
    πŸ“ HiTec HS-785HB Sail Servo.
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 1 hour ago
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    Hi Doug,

    Well spotted, I am a newbie. I built a 1 metre North Atlantic trawler 25 years ago but things have changed since then. Very grateful for your input, hopefully I can now move on with the project.

    Cheers
    JohnπŸ‘
    1
    RNinMunich
    Fleet Admiral
    πŸ“ HiTec HS-785HB Sail Servo.
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    Country: πŸ‡©πŸ‡ͺ Germany
    Online: 3 days ago
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    Hi Chalkie,
    "Sometimes we overlook the simple things."
    That includes explaining what the abbreviation EPA means to a newbie!

    @ John B,
    EPA means End Point Adjustment.
    Which means that, IF your TX has this function, that you can adjust the end throw of your servos, usually up to 150%. So if you are not satisfied with the current throw of your servo look for this adjustment in the manual of your TX.
    All modern RC gear has this function. Which TX/Rx are you using?
    Cheers, Doug 😎
    3
    Young at heart πŸ˜‰ Slightly older in other places.;-/ Cheers Doug
    Ianh
    Lieutenant Commander
    πŸ“ HiTec HS-785HB Sail Servo.
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    Country: πŸ‡ΏπŸ‡¦ South Africa
    Online: 1 hour ago
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    Just a small point the sail(s) should not be very tight as the servo will drain the battery if it is trying to pull the sail and stalled.
    Centre the sail servo with a servo tester and then see how it moves.
    Set the winch and see where its maximum travel is required take note that the sail at dead centre will be with the stick in the centre ( sail should not be Taut)
    A lot of guys running Hitec's mark the transmitter with a piece of white tape to stop overtravel
    2
    Only old in years not mind or soul.
    Martin555
    Fleet Admiral
    πŸ“ HiTec HS-785HB Sail Servo.
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    Hi John B.
    I agree with Graham adjust the stick centre trim first, then you can set everything else from there.

    Martin555.
    2
    If it looks right it probably is.
    Chalkie
    Leading Seaman
    πŸ“ HiTec HS-785HB Sail Servo.
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    Country: πŸ‡¬πŸ‡§ United Kingdom
    Online: 7 days ago
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    Hi Roy,
    Sometimes we overlook the simple things. Has the EPA been set to suit a previous model? Hope it helped.
    2
    roycv
    Leading Seaman
    πŸ“ HiTec HS-785HB Sail Servo.
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    Hi, very powerful servo make sure you check the end travel all the way as if you consider the sails are in and there is more travel adjust it so the end travel coincides with 'in'. Anything more can drag the boom mast down to damage it.

    Sailors usually remove the spring centring of the left stick, is the Tx new? You may well have the ratchet modification in a small plastic bag.

    With the ratchet in place you can reach a correct setting of the sails and just leave the Tx stick in this position rather than having to hold it in place.
    good luck
    Roy
    4
    Graham93
    Captain
    πŸ“ HiTec HS-785HB Sail Servo.
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    Hi John,

    That’s what I thought you were doing. Sounds like the servo is working correctly then. The HS-785HB is specified for 3 1/2 turns from end to end of the stick travel. So I would expect 1 3/4 turns when you push the stick up from centre and 1 3/4 turns when you pull the stick down from centre. Giving a total of 3 1/2 turns. You are getting slightly more than that. Adjusting your stick centre trim would even up the rotation.

    Graham93
    3
    John B
    Able Seaman
    πŸ“ HiTec HS-785HB Sail Servo.
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    Hi Graham,
    Thanks for getting back to me.
    I have it linked to the left hand sprung stick but I get the 2 turns when I push up and 1 3/4 in the opposite direction when I pull down. I'm puzzled.
    I hope yours are all okay when you get them.

    Cheers John
    1
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