Arm Winch Rig Setup

[John Taylor]

Hi Members

I am wanting to use an Arm Winch within my RG. However, I am unsure how to achieve the appropriate distance of travel for the booms to fully move in/out. 
 

I have no experience on this type of setup, Assuming I have to use 2 pulleys to achieve the distance required? I would be grateful for any advice or diagrams showing how to create this set up.

 

Regards

JT

[John Ball]

HI John,

If you put the servo on one side of the boat, then the arm length is limited by the beam. So putting a block on the end of the arm, and securing the dead end to a bulkhead, then the sheet movement is twice the length of the arm. See item 1:2 in the attachment. Just make sure that the sail sheet line passes over the servo shaft when the arm is full in

If you are concerned with the amount of travel available, then move the sheeting point on the boom closer to the goosneck, as that will reduce the travel required.

John

Edited August 11, 2024 by John Ball

[John Taylor]

John,

Thanks for your input and diagram. We will use this setup for my 'Smarty' (RG).

Regards

JT

[Dave Kent]

Hi John

My RG65 has an arm winch and servo mounted on top of each other. Servo on the top, arm winch on bottom. It has plate over the top that holds them into the boat. 

Using a 2:1 purchase is enough, tied back to the rudder post. Mine doesn’t even have a block, the arm has a ferrule in it for the rope to run through. Sheet on deck is tied to elastic led forwards like a DF65. 

 

 

Edited August 19, 2024 by Dave Kent

[John Taylor]

Thanks Dave for your input, I will take a picture of my internal set up once I receive my boat.

JT

[Dave Kent]

I’ll take a photo of mine, it’s quite simple.

[Dave Kent]

I’ll take a photo of mine, it’s quite simple.

[Dave Kent]

Above @John Taylor

[fastwave]

2:1 should be enough. Any more is an issue with a small servo.

ideally you need to get the job to oppose the mainsail by being on the other side of the arm. This way you reduce the load required