FRESH vs. SALT?

[wolf IV]

I run in salt water and do all my testing in saltwater as its close to me (like 3 min) away from my garage.. my question is : WILL A BOAT RIDE DIFERENT IN FRESH WATER AS TO SALT? ALSO, CAN THE BOAT POTENTIALLY GO FASTER ON FRESH OR SALT WATER? AND WHY....

[ozzie-crawl]

i think there has been a few discusions on salt v fresh.
i know a guy who runs gas boats. he was tuneing a hydro in fresh water and constantly running in the mid 70 mph range,went racing in salt and couldnt get more than 68 mph on same setup,went back to fresh and was back in the mid 70s
not sure if one is ultimatly quicker than another but diffrent setups are probably needed

[hydromaddicted]

A given volume of saltwater will have more mass than the same volume of fresh water.Thus, it's a little harder to push through for boat and prop.

[Xcesive8]

Thats wierd scott, cos i always thought salt water was more buoyant than fresh?
Recently we went up to brissy with our gas boats and used the brissy clubs freshwater lake, and everyone of the guys from gold coast was saying there boats were a lil slower.

I wonder if you sat a boat in fresh, took a mesurement of water line down the side of hull, if it would be any difference at all to how it sat in more buoyant salt?

[hydromaddicted]

Yes salt is slightly more boyant,when it comes to speed alot depends on the actual salinity of the water.

[ozzie-crawl]

i think its the density of the water that makes the diffrence not the bouyancy

[ozzie-crawl]

lol bit slow with my replie

[wolf IV]

i think its the density of the water that makes the diffrence not the bouyancy

you all hit my question(s) on the nose.. i was battling boyency vs. density...??

[wolf IV]

So whats the verdict? I run 67 in salt , will i hit 70 in fresh!!!

[Xcesive8]

Seawater
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Sea water in the Strait of MalaccaSeawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5%. This means that every kilogram (2.2lb), or every litre, of seawater has approximately 35 grams (1.2 oz) of dissolved salts (mostly, but not entirely, the ions of sodium chloride: Na+, Cl−). The average density of seawater at the ocean surface is 1.025g/ml; seawater is denser than freshwater (which reaches a maximum density of 1.000 g/ml at a temperature of 4 °C (39 °F)) because of the salts’ added mass. The freezing point of sea water decreases with increasing salinity and is about −2 °C (28.4 °F) at 35 g/l.[1]

[BakedMopar]

The pond I run on has salt water entering a fresh pond. At that end of the pond I have broken at least half a dozen props.

[ozzie-crawl]

with surface drive props and hulls hardly touching water does bouyancy even come into play while the boat is running,i think the dencity is they decideing factor, the more dence maybe the less prop slipp but then is it harder for the prop to cut threw?

[wolf IV]

with surface drive props and hulls hardly touching water does bouyancy even come into play while the boat is running,i think the dencity is they decideing factor, the more dence maybe the less prop slipp but then is it harder for the prop to cut threw?

I DOUBT BOYENCY HAS ANY PLAY AT HIGH SPEEDS W/ LOW DRAG BOATS. my theory was/is: Fresh water may be a little , key (little) harder to get on plane( less boyency), but a higher top speed . Saltwater easier to get on plane but lower speeds due to the density. So is this fair to say?

[ls1fst98]

well think of it this way, when a full size boat tries to do full speed and record runs what do they do them in? fresh or salt? most i have ever seen is salt. i would think that with the time and effort and research that top racing teams put into these types of runs this question would have been brought up, researched, and answered. just my idea. not sure if its right or wrong.

i would assume that being salt water is more dense than fresh, the prop would both encounter higher friction rotating, but allow greater push so to speak.

::edit:: but then again unlimited hydros run in fresh as well as drag boats. a lot of that is due to water conditions though.

[BakedMopar]

My sv27 runs a tad hotter on salt water also.