Thanks for the help, you can tell I haven't owned a diesel before.
If you're over loaded in normal mode, overdrive would be way over. Gori does not state how much pitch one gains spinning the blades backwards. So if the prop is correctly sized to let the engine just hit max RPM, then O/D must be used with an understanding of engine loading/fuel supply. All Gori says is "same speed at lower RPM". No hint of possible engine damage (of course). So a operator could easily engage O/D mode & firewall the throttle expecting 4th mode speeds, and if they do not know/don't care/can't see exhaust (& don't know how to read it) can damage engine. RTFM doesn't work, it's not in the manual. Even the Yanmar manual doesn't talk about smoke colors, so how does the average boat owner learn? the hard way, after paying the mechanics a few $$$$. Yanmar dealers/mechanics are stressing this quite a lot, lately. Must have had some expensive warrantee claims.
Prop pitch is a related to exhaust temp
You have achieved some sort of God status for the time being don't waste it! Maybe time to head to the casino!
^This. Indefinitely, without a smokeshow. Anything else and youre gonna start breaking stuff right when its most inconvenient, while trying to make those last couple miles to harbour against 30 knots and a steep sea..
Easy there Thor.. was more referring to getting a prop company to admit that big of a error and cover it all. The luck is strong.
Um, no. A tied down boat will put more load on the system than a moving boat. If you can hit max RPM tied up you are underpitched a bit
Yes, on a 26 knot powerboat. However the difference between being tied in a slip and grinding into a gale and monster seas is minuscule for a sailboat. The tach error is likely a bigger difference.
Not getting this, maybe a little slow. If you can hit full rpm at the dock then it would seem you are within a decent load curve. As you state it puts more load on the system or am I missing something. Unless you are referring to being right at the line at full RPM on a seaway being less load so at the so at the dock you should not be able to get full rpm? Like I said a little slow.
^^Note the RPM discrepancy Istream has measured. Now, I don't know enuff about propeller physics to competently explain it, I just know it happens. And different engine/trans/prop will yeild different deltas. Bit when testing a prop, all prop companies want the final test to be flat water, no breeze, clean hull. Engine loading under foul weather will depend on some other things: how much is prop being thrown about due to hull movement? Size/steepness/angle of waves hitting the boat will all change prop loading.
