I own a 31' Mariner
Mark II fitted with twin 165 Volvo Diesel
When the boat was out of the water in May for regular anti-fouling I decided
to remove the propellers and take advantage of your Free Prop Scan propeller inspection.
I believed my props were in good condition, as I had not hit any objects or
sandbanks. Both engines achieve their maximum revs however the port engine
has always shown 150 rpm less than the starboard engine.
After you conducted the prop scan on both props
you were able to show on your computer that both
props were in original condition – however
not perfect. You were able to further identify
a deficiency in the port prop, which you suggested
might be the reason for slightly less revs from that engine. A few days
the props were ready and your scans showed a noticeable improvement on
your computer readouts. Your comment was “You
will think you have a new boat".
How right you were. On first returning from the hard stand back to my berth
you could notice the smoothness of the engines at idle.
Then on the first trip out the performance was outstanding. A new coat of anti
foul helps but I now had two engines performing to identical rpm. The GPS showed
between 3 and 4 knots more that the boat had ever achieved even when previously
anti-fouled and a similar improvement in cruise speed. The smoothness and reduction
in noise is quite evident.
Being a former motor race owner/driver I am well aware of the cost associated
with achieving this level of improved performance. But not in this case.
The cost involved in the modification of both propellers has given me
a new boat and I highly recommend prop scan to all boat owners.