<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" class="">I posted this on the 7th but didn't see it.</div><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" class="" dir="ltr">Apologies if you already received it.</div><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" class="" dir="ltr">Anyone looked at or used these.</div><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" class="" dir="ltr">They record speed.</div><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" dir="ltr" class=""><a rel="nofollow" target="_blank" href="http://www.knotstick.com/" id="yiv5975222045yui_3_16_0_1_1454723982197_19170" class="" style="color: rgb(25, 106, 212); background-color: rgb(255, 255, 255);">http://www.knotstick.com/</a><br></div><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" class="">They look like they could be mounted by a side view port</div><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" dir="ltr" class="">to show speed. I had to google images of them to see how they were</div><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" dir="ltr" class="">constructed. It's a disk on a string that drags through the water. It is attached </div><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" dir="ltr" class="">to a stainless spring in a cylinder & as the spring is extended it pushes a white sleeve</div><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" dir="ltr" class="">along a calibration marked on the cylinder to indicate speed.</div><div id="yiv5975222045yui_3_16_0_1_1454723982197_19142" dir="ltr" class="">Alan</div></div></body></html>