R
Richard mac
Guest
" Hi again,
My 31 ft steel ya
" Hi again,
My 31 ft steel yacht is very heavy, at approx 8.5 tonnes. It has a 27 hp 3hm Yanmar diesel, which runs very well, except will not drive the boat at over 2200 rpm. It just bogs down and starts blowing more smoke. This is about 6 knts. I would imagine hull speed for the boat would not be much above this, so it would seem that the boat is overpropped, as the Yanmar is supposed to rev to 3200 rpm. However, it is the original yanmar prop, which comes with the Motor, gearbox, shaft, all matched to each other. So it seems strange that it could be massively overpropped, to the tune of losing 1000 rpm.
It also does not look over big compared to plenty of other props at our boat club. In fact it looks quite small.
Thoghts anyone? by the way the engine revs cleanly all the way to redline in neutral.
Thanks for your advice.
Richard. "
My 31 ft steel ya
" Hi again,
My 31 ft steel yacht is very heavy, at approx 8.5 tonnes. It has a 27 hp 3hm Yanmar diesel, which runs very well, except will not drive the boat at over 2200 rpm. It just bogs down and starts blowing more smoke. This is about 6 knts. I would imagine hull speed for the boat would not be much above this, so it would seem that the boat is overpropped, as the Yanmar is supposed to rev to 3200 rpm. However, it is the original yanmar prop, which comes with the Motor, gearbox, shaft, all matched to each other. So it seems strange that it could be massively overpropped, to the tune of losing 1000 rpm.
It also does not look over big compared to plenty of other props at our boat club. In fact it looks quite small.
Thoghts anyone? by the way the engine revs cleanly all the way to redline in neutral.
Thanks for your advice.
Richard. "