http://continuouswave.com/cgi-bin/crouchcalc.pl
I've been playing with some ficticious figures and I'm going to polish the bottom of my boat.
I had a 25' FB Bertie moored for a while (antifouled & clean as a whistle) and a mate had an identical one that was kept out of the water & highly polished as well, his went heaps faster than mine.

Hey Fed, weight distribution plays a major part in speed. it depends how much of the boat is coming out of the water. try adding an extra person to a small boat and you cant get it on the plane unless you distribute the weight to the right position.

After playing with that calculator for a while I'm also going to clean out all the junk from my boat.
HMMM... better get a new prop too.

Not so much on trailer boats.

But having a clean bum on a moored boat makes a huge difference you notice it right away esp after you've just slipped it & cleaned the hull.

You got that right Jumpy, I had a 23' FB Huntsman moored, took it out one day and couldn't get it to plane.
Was powered by a 308 sterndrive!
All it had growing on it was some little tiny barnicals that look like tiny volcanoes and some of that weed that looks like very fine hair.
Cleaned the hull & it went like a rocket.

I remember that huntsman you had it in the workshop when I saw it.

If I didnt use my moored boat fir a while & let it sit there I'd get black exhaust smoke [unburnt fuel] coming out instead of the nice light grey smoke.

And you could hear the Turbo's working their arse's off but the boat wasn't moving different story with a clean bum it was time to Johny O'Keefe Rock'n Roll

FED, have you heard of "Lanotec"?

I remember a while ago a Ferry company had 3x Ferry`s. After cleaning down, they applied Lanotec to 2 of the Ferry`s (hulls) not only were they faster, but they got an increase of 30% on fuel usage/saving.

This stuff is good for just about everything. There are Gel`s, liquid`s, Spray`s and Grease type stuff.

If ya have`nt heard of it, basically, an old Shearer came up with it. As you will notice, if you look at an old shearing shed the timbers are all still in good condition. Reason is the lanolin from the wool. This is what Lanotec is made from.

I saw a car, rubbed back to bear metal and left outside for 2 1/2 years. No rust, `cause it was sprayed with this stuff.
Most of the big and oversize earth moving companies up North use it extensively on their "bluddy big things" and save heaps on maitanence.

N.P.W people also use the stuff to put on all their timber walkways (paths elevated to stop peeps walking on the ground) through rain forrests or wet land areas.

I used to use it on a little 16` half cabin thingy and it would just glide through the water. The difference you get with a clean Hull is minute compared to rubbing on Lanotec!!!!!

I`ve even used it on my F/Reels for lube, M/Bike stuff and all engine and bearing greasing. Its great on Leather.

Heres the site... http://www.lanotec.com.au/
Have a bit of a look...sh#t there`s heaps more product since I last looked at it!!! I might go through it again myself.

Cheers.

Knowing my luck it would scare the fish away Jack.

I used to do alot of competitive sailing in my younger days, and I remember certain polishes and soaps etc being banned..

Remember the old dishwashing liquid trick with a bottle cap in the sink?? One boat was actually disqualified for using dishwashing liquid as it causes the water to disperse and the boat moves more smoothly through the water?

Some tech Guru probably can explain this all better than me.

Anywayz, the one that we were still allowed to use that was benificial were teflon based polishes. The water would bead on the bottom of the fibreglass and therefore move through the water with less resistance.

Another trick that i think is illegal now is to put a pack of crushed up antibiotics into your antifoul...
Kills the groth and can double the time that yuor anntifoul lasts