Sail Arm Servo geometry

Sail Arm setup in an Ellipsis IOM. The aft turning block will be mounted on the deck closer to the transom. The red tape on the sheet indicates the location of a loop or split ring where the main and jib sheets will be attached to above the deck. Note, the arm is 2.75" long and gives 11" of travel with a 1:2 sheeting setup. The close hauled sheeting position is shown at the start and there is virtually no current draw on the servo, as the sheet is pulling directly over the servo arm pivot point. This also has built in mechanical exponential when close hauled and running. As the arm moves in an arc the sheet is slowly eased at the ends of it's travel.

[@elsiesmith1771]

This is very cool. Thanks for the look inside.

[@scratchy101]

There is a teflon tube (used or 3D printer filament feed tubing) which does a 180° turn from below deck to above deck for the lightly loaded tension line.

[@TailEndCharlie-fi9gd]

Does this move the jib and mainsail?

[@scratchy101]

Yes, I put a loop in the line above the deck where the piece of red tape is. The both the main and jib sheet lines attach to the loop.