hull speed and drop offs

Robert M

Captain
Joined
Feb 19, 2012
Posts
577
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Location
Gloucester MA
Boat Make
2000 Genral Marine 31 duffy Hull
Ok just looking at the test runs when boat was first launched. I understand the boat was much lighter that day.
Stacey from Genral marine recorded 29knts 2001

My test run last year in florida 27-28knts ( added generator and what nots)

Im now maxing out at 24knts. ( case of beer rods ,takle , etc )
]
I had to drop the boat in as soon as it was delivered. The boat was clean as hell because it was kept on a lift in FL. The boat had been soda blasted and painted the year before, when it showed up it had new zinks, and good bottom paint. I gave it a scrub at the beach once( a little bit of algae, but not the end of the world).
My mechanic, who is a certified cummins tec, says the motor is purring. Told him to go through it and treat it like he owned it.

Why have I lost 3knts?
 
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Robert M

Captain
Joined
Feb 19, 2012
Posts
577
Likes
76
Location
Gloucester MA
Boat Make
2000 Genral Marine 31 duffy Hull
fyi motor only has 775 hrs on it and has been pampered, oil and filters changed yearly or evry 100hrs
 

CEShawn

Vice Admiral
Joined
Sep 21, 2011
Posts
3,325
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1,224
Location
Cape Cod, MA
Boat Make
Downeastless
See how fast it goes at the end of the year with everything off of it! LOL

Is it a NIBRAL prop or just bronze?
 

mfrench808

Lieutenant Commander
Joined
Feb 1, 2012
Posts
196
Likes
106
Growth on Bottom

I lost between 2-3 knots on a 28ft downeast boat with a bottom that had growth on it that accumulated in 3 months because of warm water and little use. hauled out, powerwashed and got the 3 knots back
 

Stinkpot

Commander
Joined
Dec 2, 2011
Posts
256
Likes
148
Location
Cape Cod Canal
Boat Make
36' Calvin Beal
What kind of beer? I mean a heavy imperial stout, like 9% to 10% or are we talking Bud Lite?

Not really in regards to the boat speed, but just wondering if I should stroll down your dock...:rolleyes:
 
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