Ballast Wear and Tear on Boat

*mtrbtr*

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May 1, 2011
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I have an '89 Mastercraft Prostar 190. Great Slalom ski boat and not bad for wakeboarding, but I just purchaced fatsacs to try surfing. I know lots of people use fatsacs in these old boats. My question is, how hard are they on the motor and boat?
My boat is in great shape and I want to keep it that way. Has anyone noticed any extra wear and tear on their boat and/or engine from using fatsacs?
 

ThreeMileBayWaker

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Re: Ballast Wear and Tear on Boat

same wear and tear as if having more people on board, stay around your load rating and you should be fine. Yes its more stress on the engine, but as long as its in good shape and maintained... no issues.
 

tgell001

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Re: Ballast Wear and Tear on Boat

Good to know, I really take care of my boat but man I fear this same thing. I run 3/4 of a tank of gas through it full of people and weight 0-full throttle over and over again towing my friends all day. My plan was just to sell it before I had problems haha
 

oldjeep

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Re: Ballast Wear and Tear on Boat

same wear and tear as if having more people on board, stay around your load rating and you should be fine. Yes its more stress on the engine, but as long as its in good shape and maintained... no issues.


I disagree with the same wear and tear as having more people on board. The fat sacks are making the boat plow and not plane properly which creates a ton of drag and makes the motor work a lot harder. In a ski boat I'd be more worried about what it is doing to the transmission.
 

ThreeMileBayWaker

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Re: Ballast Wear and Tear on Boat

I disagree with the same wear and tear as having more people on board. The fat sacks are making the boat plow and not plane properly which creates a ton of drag and makes the motor work a lot harder. In a ski boat I'd be more worried about what it is doing to the transmission.

.... and adding more people does what, just take up more seating space inside your boat with no other consequences? That comment right up there with the comment I received from a girl at the gas station this weekend... ([Her]Why are you putting the fuel nozzle in your boat?.. [me]To add fuel to it... [her] :Turns to her friends:, "Boats use gas?" )

Extra people have the same effect as using ballast bags, they weigh down the boat causing more water displacement and ultimately a bigger wake. Ballast bags are more ideal because they can be hidden in storage compartments and more room to move around the boat. They can be added to the bow ski lockers or stern storage compartment. Hell even manufacturers are factory installing up to 1,000 of ballast capabilities. The 4-5 extra people required to hit 800-900 lbs of ballast takes up too much room, cluttered boats are no fun. The boat only "plows water" while getting up on plane, most boarders ride 20-22mph which is above the planing threshold. Lesser HP boats will struggle more than us with V6's or V8's. If you wanted to wake surf behind a direct drive, that if anything is causing the most stress because you are plowing water and using A LOT of ballast.

Stick within your manufacturer's suggested weight rating and you'll be just fine, going over that then you start to run the risk of back flooding your engine from the static water level creeping back over your exhaust risers.
 

brick75

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Re: Ballast Wear and Tear on Boat

.... ([her]why are you putting the fuel nozzle in your boat?.. [me]to add fuel to it... [her] :turns to her friends:, "boats use gas?" )

wtf?!?:facepalm: Amazing how dumb people can be.
 

oldjeep

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Re: Ballast Wear and Tear on Boat

Extra people don't all sit in the back of the boat. While it may work fine for your huge runabout it does something entirely different to a little tournament ski boat which is what the OP has.

For reference, this is what a prostar 190 is - a sweet low riding ski boat, not a wakeboard boat.
IMG_0560_1_.jpg
 

*mtrbtr*

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Re: Ballast Wear and Tear on Boat

Old jeep, thats exactly what my prostar looks like with a different color. I know they were made to ski behind and not throw a wake and thats mostly what we do but we want to try a little ballast just to see what happens.... interesting discussion.....Thanks everyone.
 

tgell001

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Re: Ballast Wear and Tear on Boat

Then do it! boats are suppose to be fun, and the fact that youre asking the question to begin with means youre not stupid. Anything within reason is a good motto to live by
 

salty87

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Aug 12, 2003
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Re: Ballast Wear and Tear on Boat

weight is weight, doesn't make much difference if it can walk or not.

one of those difference though is the deck. fat sacs are dead weight running between the stringers. i'm not sure what MC used to make boats in 89 but if your floors are anywhere near soft, the fat sacs will make them sag between stringers. the increased sag could lead to water getting into your deck...if it's plywood. there's usually water/moisture under a full sac too so don't leave them full for extended periods.

tons of MC's are running fat sacs of some sort. you should be fine.
 

*mtrbtr*

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Re: Ballast Wear and Tear on Boat

Just an update used 2 side sacs and an extra one on the back right. We had a big enough wake and the boat actually handles pretty well and it didnt feel like there was a lot of strain on it. So that part was a success. My buddy surfed great. Now me....i need some practice.
 
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