help me does shaving weight gain mph
 

if i shave 100lbs. will i gain mph?? how much should i expect for every 100lbs. on a 3750 lbs. boat ?? thanks for your help

Maybe 1 Mph........if you are lucky

Tough call, on some pleasure boats maybe nothing. I'm interested to see the variety of answers on this one. How much does it speed up low on fuel. That is probably your best test every 14 or 15 gallons is a 100 lbs approx.
Jim

what are you talking about????????????????????????????????????????????? ?????????????????????????????????????????????????? ???????????

Steve is suggesting other ways to find speed. Do you recognize the terms he used?
Jim

no i dont

What type of trim tabs do you have? Some brands can be installed in such a way that the drag in the water. He found with his buddies boat the engines liked more air available in engine compartment. Hook refers to the contour of the bottom. A hook helps it ride nice but reduces speed. MPH doesn't often come easy in boats, the things Steve mentioned are generally the easiest path to search. Its good info being he knows the boat.
Jim

im not looking for mods info,i asked about weight,how many miles per hour can one expect from shaving 100 lbs. from a 3750 lbs, boat ,i have a 1997 scarab scs 23 ft.boat, im just wondering aboat weight ,does it effect top end ???if it does how much faster will i go if i shave 528 lbs, from the boat ,,,which would include getting rid of my friend that ways 220lbs. and 308 lbs, of fuel for a total of 528 lbs less than before, would i get 6 mph. more ??? thanks don

Don- that sounds like a good excuse for a boat ride. Do the test. I'm not familiar with your exact boat to know. Some boats are more weight sensitive than others. To answer "If you can expect 6mph or more" I would say no, Maybe a couple. There are countless variables involved with weight and speed in boats. Taking weight from the bow will have a greater effect then else where. Good luck.
Jim

ok i will do the test,i have only been out in the boat twice,the first time with a 23p 3 bade and then 26p4blade,with this new prop im getting 4900 rmps and 68.7 mph on a gps unit,with a 220lbs. freind and a full tank of gas 54 galons, just wondering if i shaved off 528 lbs.what to expect,you have helped me before with risers and manifold questions,thanks again don

In a boat running light won't net you six mph but just leave your friend on the dock lose some fuel and see where it takes you. Just a good straight line without scrubbing speed could net you a few. But if you do not know what a hook is or dragging tabs that is better left alone for now. Good advice Steve.FYI I wouldn't think he is your friend if you tell him to stay on the dock today I am gonna go faster.Mods may be the better route.

thanks so much for your input

Why not just run the boat with GPS, add 100lbs, easy enough, and run it again before pulling things out of the boat.

My 29' Scarab is very sensitive to weight, the more gas I burn from the tank the faster I go:D(but only a few mph) And yes they do have some major hook, not sure about the 23' bottom though. The hook will prevent the hull from airing out even without the weight.

NO way you will get 6 mph for 500lbs. Maybe 2-3 at most. My 24 outlaw is much more weight sensitve than my 32'.