sans wind vane
But where? Since the cockpit display only allows for +/- 15° calibration adjustment, it is important to get the vane on there in the correct orientation. Rather than climb to the masthead and try to adjust it up there with Jane in the cockpit below telling me when I have it turned dead ahead (too much drama, aside from climbing the mast again), I made up a patch cable and hooked the transducer up directly to the cockpit display. The tricky part of that task was to make connections to each of the 6 pins in the connector on the transducer, pins which are very close together.
|Alternate use for DB9 connectors|
Now I could turn the shaft on the transducer back and forth to get the display exactly centered. And then I marked things to retain the results of this work.
OK, so now I know how to orient the wind vane.
What wind vane? I don't have one anymore. Da%$# fat bird!
It turns out that a 1" PVC pipe cap is just about the perfect size to fit over the body of the transducer, reaching down the sides a distance to protect against water intrusion, and making a pretty tight fit around it. So I started with that as a base.
|Mark 1 vane|
But I am not going to install this vane yet... I am concerned that it may be too heavy. To lighten it, I could make the vane out of lighter-gage brass - that would allow me to use a smaller counterweight. Or I could make the vane bigger and mount it closer to the PVC cap - that would also mean that the counterweight could be smaller.
But before I try either of these, I am going to try my hand at making the vane assembly entirely out of aluminum.