Towing vs Davit.....

Hopper5

Have you tried running without th tender and some of the other weight yet? I'd start with the easiest possible solution first?? There is a real chance that the boat is just overloaded....

There is no way a 800 lb (max) tender is dragging the boat down that much. I've had way over 800 lbs of people on board my boat with gas engines and only lost maybe 1.5 mph at cruise.

RB480

I am certainly no expert, but why not try the simple things first? The op in his first post says a lot of granite and other things were added by a previous owner. That means weigh and 3116 in a 44 is not exactly overpowered. I have 820's in a 50 and full fuel and water can drop,me 2 knots. Why not check the weight? It doesn't cost as much as a short haul and a prop tune

Hi,

It could all stem from the additional marble and tile the previous owner fitted,
the props could have been trimmed to reduce load and increase rpm.

The fact that the water line had to be raised should be ringing an alarm bell as loud as the no oil pressure one.

There is a sad but great book called An American Tragedy that covers the loss of two boats in calm water that had the waterline raised a few times - so much in one case the designer dud not recignise his own design at the enquiry.

If you can post a picture of the boat I should be able to tell pretty easily if the waterline has been raised at all.

x2

Accurate speed trials coupled with a digital prop scan will reveal a lot. The props may have been changed for any number of reasons. Propellers move boats not engines. You could double the hp in the boat but it is still going to go the same speed at that rpm. What is your transmission ratio? We could run a basic slip calculation with that number.

When you consider how much weight has been added compare that to the weight of the fuel with full tanks vs 1/4 tanks. Running on 1/4 tank will probably offset the remodeling weight.

Ok so if I've got your numbers correct.

24" pitch x 2400 rpm / 2.04 ratio / 12" per foot = 2352.941 ft / min

2353 ft / min x 60 min / 6076 ft = 22.2351 kn

And you are getting 12 knots? 50% slip is way too high. Either my math is wrong or your props are. Or both

A digital prop scan where a digitizing device is used to scan the geometry of the prop and determine it's true size and pitch as well as a host of other dimensions. It's pretty common now.

Judging by the pics of the boat, the waterline has not been raised. Since the striping is also the Carver blue/grey they used in 1994 that also leads me to believe that they have not been changed.Almost all of the 440s that I have dealt with have been known to look a little stern heavy in the rear when they have diesels and a moderate amount of fuel in them.

I definitely say weight has some play in the factor but it shouldn't be dragging you down that much.

I am thinking somewhere along the lines the props have been taken out of factory spec. Its possible one of the prior owners always ran the boat at hull speed and changed the props to maximize fuel efficiency at lower rpms vs. speed?