Fuel burn 45’ vs 53’

[Hookedup2407]

Maybe he means with a following sea? My 45 is pretty much the junior version of the 53 hull and in a sizable following sea the bow can dig in. a handful even for the AP. Waves on bow or off beam is never an issue and she shines

Yes, in a following sea returning into the inlet on a hard outgoing tide. The keel will grab and it doesn’t matter where i point the rudders or compensate with throttles she goes where she’s pointed..

[Hookedup2407]

In a 53 a QSM is minimum. That's a heavy boat for a c series.

The C series were in my 46 and it saw 22kts WOT

[rsmith]

21 gross tons vs 41gross tons.. this 53 is a complete pig and one of the scariest boats I’ve taken through the inlet. Other than that it’s a great platform

That’s BS you need some inlet running lessons. And the 50/53 is 50,000 lb not 82,000

[Bob Bradley]

In a 53 a QSM is minimum. That's a heavy boat for a c series.

I have the QSM11s in my 45. Mine are 535hp and are a good match for the boat. I'm not sure I would recommend the engines for a much bigger boat. Yes, I realize they are available in 635 and I believe even over 700. The problem is that if you use all those hp, the dry exhaust and turbo will get too hot and either cook the gaskets or crack the exhaust manifold. You shouldn't exceed 20gph per engine or you risk cooking things. That is less than 535hp. On the pins I'm burning 25 - 26gph per engine. At 20gph, I'm turning somewhere around 2100rpm and making 23-24kts. Configuring these engines with higher HP just means you have more HP that you shouldn't be using unless you want to be swapping exhaust components regularly.


Don't get me wrong. I love my engines, by I understand their limitations. I do not think I would want them in a much bigger boat.

[jim rosenthal]

They have been put in bigger boats, but I don't know how good an idea it was. Sky pointed out recently that they have issues with exhaust manifolds cracking, I think it was. I don't know which rating that was. It
s too bad Cummins Marine doesn't make a larger diesel than the M11 in a pleasure craft rating. Must not be enough market for it.

[rsmith]

I was on a 45 Rybovitch yesterday at the Stuart boat show. They pulled out QSM11’s after 10 years of manifold and head problems. They repowered with smaller Cummins and get the same speed and better economy since they couldn’t push the throttles up on the old engines without problems.

[SKYCHENEY]

I was on a 45 Rybovitch yesterday at the Stuart boat show. They pulled out QSM11’s after 10 years of manifold and head problems. They repowered with smaller Cummins and get the same speed and better economy since they couldn’t push the throttles up on the old engines without problems.

Probably C-series at 600hp

[rsmith]

probably c-series at 600hp

qsb6.7