Since we will have to have some sort of feedback on flexion and sail trim, I propose to try to look into waterproofing some rubber stretch sensors and attaching them like this below, alternatively, these 1 meter long stretch sensors can run the entire length of the boat on EITHER side to determine the boat's flexion.
And for the motor, with the torque based on this boat winch's torque that wasnt quite enough
Worm gear: pressure angle 14.5 degrees I think
gear reduction just will be based on number of teeth on the spur gear, that we will mount a winch to.
we want an output torque of about 20 kg-cm and 30-50 RPM.
So, find a DC motor. Then find a worm gear to match its shaft. Then find a spur gear with the same pitch and the desired number of teeth for the gear reduction to be the desired RPM (DC motor's RPM / number of teeth), and the torque based on the gear reduction (DC motor's torque * number of teeth).
ie 24 tooth spur means the gear reduction will be 24 so
I like this but it is pricy, and I'm not sure if it has a worm gear driving it (I guess probably not because it doesnt say so in the documentation).