Hi Martin,

Many thanks for your input.

Cheers
John

Many thanks for your input. I think I can get on with the project now.

Cheers
John

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
John👍

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 😎

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

Hi John B.
I agree with Graham adjust the stick centre trim first, then you can set everything else from there.

Martin555.

Hi Roy,
Sometimes we overlook the simple things. Has the EPA been set to suit a previous model? Hope it helped.

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

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

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

Hi John,

Puzzled by your explanation. Are you driving it from a centre sprung stick on your Transmitter. From your question it sounds like you may be. In which case, you are getting 3 3/4 turns in total which sounds about right.

I have a couple of the same servos on order from Santa for my sailboat, but I’ll have to wait until he delivers them Friday. 😂🤣

Graham93