Steaming mid-section [Yamaha 30 2S]
When the sun is shining, the water is calm and everything just works there is nothing better...
However, after plodding along at 6.5 kts for a mile or so I noticed the mid-section had got hot enough to be steaming significantly. Of course, it will always be pretty warm but I hadn't seen an engine steam like that before.
The tell-tale streams like a horse weeing after a lot of cold lager;
The water from the tell-tale isn't hot;
The engine runs OK;
On each cylinder the compression is OK and almost identical to the other;
The steam doesn't seem to be coming from the low-speed exhaust - its just a fog around the mid-section;
It is definitely steam, not exhaust.
A few knots more and it seems to disappear.
Have I just not noticed this in the last thirty years or is this 'outside normal parameters'?
"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin