Obi Cloth Jittering

[adamjm]

Hi, 

I'm trying to make a yacht sail, and am finding the cloth jitters/jerks every few seconds. Any idea what I'm doing wrong?

Here's a video of the issue: https://youtu.be/Lf0cFK4tRJg.

There's currently am ambient force zone applied perpendicular to the sail which is working correctly and making it 'bow' outwards. There's no turblence or turblence frequency applied.

The cloth is parented to a gameobject 'Boat' which moves sideways slowly using transform.position, and the sail is fixed in position using 'Fix Translation' on the 3 outer points of the triangle.

See pics here for the setup.

Any ideas?

Thanks