Thank you for the pointer, @iampete. That is pricier than I expected. I’m curious–how well do these work at higher angles of heel? I think you do foiling boats, so they mostly tend to stay upright, but keel boats, especially smaller RC ones can heel past 45 degrees. Do you still get meaningful readings then?
Also, I’m curious about the IP non-rating, “NOT allow to be submerged fully or partially in water.” My boat is unlikely to capsize, so submersion is less of a problem. I imagine it can deal with spay though?
It is and it will.
Right now, I’m just trying to figure out how to sail this rig in manual. My first milestone is just to see a wind instrument representation on my TX, so I can steer to it. I’m using a physical vane now, and it’s very hard to see from some angles.
My idea with this rig was that direct control of the AoA would make the math simpler. (That was before I discovered that Rover now supported sailboats.) I dug up this Sandia Labs paper https://www.osti.gov/biblio/6548367-aerodynamic-characteristics-seven-symmetrical-airfoil-sections-through-degree-angle-attack-use-aerodynamic-analysis-vertical-axis-wind-turbines and recalculated the lift and drag coefficients (relative to airflow) to thrust and heel (relative to hull). For every point of sail, this shows the best angle to set the wing at. (NACA0015 @ Re=80,000)
Yes. One way to deal with that is to mount the vane on the wing and subtract the wing rotation angle from the reading (I have direct control over wing rotation angle). Another is to take advantage of the hollow mast (1" aluminum tube) and thread a second mast through it that would hold the sensor. A third is to put up a separate mast in front of the main that would just carry the sensor. I haven’t decided which one I want to do. One consideration is that I have a number of sails from 3’ to 5.5’ and the sensor needs to be portable when I change sails.