How to add speed on a boat

[Landlubber]

...want to go faster for very little cost....then make the trailing edge of the transom, where the bottom of the boat and the transom meet,,,,very square and sharp, true 90 degree, not rounded the normal 3/8" or so.

There will be an increase in speed of nearly 1/4 of a knot.......this must be worth it......don't forget, it must be truely sharp edged.

[Submarine Tom]

Okay, you don't want to nitrous oxide then try turbo charging.

OR, you could start taking stuff out and lighten the boat up, that would make it go faster.

Why is it again that you want to go faster?

-Tom

[mydauphin]

Start by getting present setup working properly and recording its real performance across the whole rpm range with a gps. Do several pass measurement to make sure that wind, waves, currents etc.. is not throwing numbers off. Then average speeds per rpms. Engine WOT rpms according to manufactures specs should match your rpms. If not check you hull for growth, clean it, try again. The prop is next. Then trim. Also lighten boat take out old junk out.

[PAR]

Foils . . .

[Bglad]

Originally Posted by mydauphin

Start by getting present setup working properly and recording its real performance across the whole rpm range with a gps. Do several pass measurement to make sure that wind, waves, currents etc.. is not throwing numbers off. Then average speeds per rpms. Engine WOT rpms according to manufactures specs should match your rpms. If not check you hull for growth, clean it, try again. The prop is next. Then trim. Also lighten boat take out old junk out.

Also check that the throttle is advancing to wide open at the engine end.

[terhohalme]

Where is the questioner?

[Landlubber]

.....Elvis has left the room.....

[mydauphin]

Originally Posted by Bglad

Also check that the throttle is advancing to wide open at the engine end.

Funny you mention that. I have run into this a lot, bad adjustment is very common.

[Submarine Tom]

The bad adjustment items are almost endless and, as you say mydauphin, very common. Bad plugs/wrong plugs, timing, dirty/clogged carbs, poor coil, poor plug wires, bad points gap, bad points, poor rotor cap, bad fuel, poor filters, intake leaks, vacuum leaks, carbon build-ups, poor valve gaps, gasket leaks, etc., etc., etc.

-Tom

[cigarboat]

Don't forget the more you add to the TOP end, the more you lose on the Holeshot, too.
cigarboat.com

[Submarine Tom]

Elvis has definitely left the building.

Probably trying to get the water out of his/her fuel...

-Tom

[cigarboat]

actually, Tom. LOL!
Now that you mention it...I had a problem last year like that.
The Pump fuel with the Ethanol was dissolving the inside of the fuel lines...

Rebuild the carbs 2 times, till a guy that repairs Lawn Mowers & Chain Saws. Told me about how the plastic tanks of older chain saws just can't take the new fuel the government rammed down our throats..