Mess Deck: General Section > Model Boating
Can two servos (drum winch) operate simultaneously from a radio receiver
Lance:
Hi Andrew,
Good to get your email letting me know of a Melbourne enthusiast. Am in the very early stages of project and have many questions especially about winch and arm servo installations and would appreciate seeing an RC installation. Not intending to race, my vessel is a 60yo basic model sloop/cutter format. Looking forward to visiting Melbourne model sailing days after lockdown (?). I live in Williamstown. (Hope the pictures are visible)[size=78%]mailto:[email protected][/size]
Geoff:
Whilst I tend to agree two sail winches are probably not required for most of our sailing models. I have used two sail drum winches on a "Y" lead what has not been mentioned is that in practice they do not maintain full alignment so you will get differential movement. It may not be too relevant on a yacht but if more accurate alignment is required a "Y" lead doesn't work well.
I speak from experience using "Y" lead for turret turning based on sail winches - they don't move the same amount even if identical models of winch.
Cheers
Geoff
tonyH:
--- Quote from: Geoff on August 18, 2021, 10:46:03 am ---Whilst I tend to agree two sail winches are probably not required for most of our sailing models. I have used two sail drum winches on a "Y" lead what has not been mentioned is that in practice they do not maintain full alignment so you will get differential movement. It may not be too relevant on a yacht but if more accurate alignment is required a "Y" lead doesn't work well.
I speak from experience using "Y" lead for turret turning based on sail winches - they don't move the same amount even if identical models of winch.Cheers
Geoff
--- End quote ---
I asked a question in the "Radio Equipment" section about possible end point creep in a small double sail winch where it's connected via Y leads to a couple of micro servos and one of the servos defines the critical end points. Malcolm kindly replied and I think suggested that this was unlikely. In trials I found that a variation seemed to come from the way the line reeled out on one drum and in on the second but the actual end points stayed within a couple of mm so am I just lucky?
roycv:
Hi re the end point creep if you have the Tx stick on a ratchet it barely notices and like you said it is just a few mms. There are positions of the Tx stick where it settles though and I figure that any unwanted movement of the winch is unnecessary current being drawn from the battery.
Roy
tonyH:
Hi Roy,
They're on a switched channel (5) rather than a stick and there are 2 micro servos plus the winch linked by a pair of Y leads. The EPAs for one of the servos is fairly critical >1mm and it's been adjusted so there's zero "buzz".
Tony
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