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Old 06-07-2022, 03:09 PM
Hartly Hartly is offline
 
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Default How much does weight affect boat speed

Hey all. A quick question. How much does weight affect the speed of a boat. I was out at Sylvan last week and had two extra girls on the boat. They each weigh approx 130 lbs each. My boats top speed dropped from 46 m/hr to 44m/hr. Is that normal ?
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Old 06-07-2022, 03:55 PM
Smoky buck Smoky buck is offline
 
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Yes
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Old 06-07-2022, 03:56 PM
muzzy muzzy is offline
 
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Weight slows boat down Im surprised with additional 260 lbs it wasnt slower
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Old 06-07-2022, 10:03 PM
Jawjacker Jawjacker is offline
 
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Quote:
Originally Posted by Hartly View Post
Hey all. A quick question. How much does weight affect the speed of a boat. I was out at Sylvan last week and had two extra girls on the boat. They each weigh approx 130 lbs each. My boats top speed dropped from 46 m/hr to 44m/hr. Is that normal ?
Hey Hartly. I was at Cold Lake last weekend . I experienced roughly the same thing. My boat normally runs 40 m/h with my self who weighs 247lbs and my buddy who weighs roughly 250lbs. My son decided to come along and he weighs 259lbs. I lost about 2.5 m/h . I even swapped out props to the exact pitch but has vent holes and cupped fins. This coming weekend Im going to try out the new prop with just two of us.
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Old 06-08-2022, 08:17 AM
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EZM EZM is offline
 
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Quote:
Originally Posted by Hartly View Post
Hey all. A quick question. How much does weight affect the speed of a boat. I was out at Sylvan last week and had two extra girls on the boat. They each weigh approx 130 lbs each. My boats top speed dropped from 46 m/hr to 44m/hr. Is that normal ?
No, that's not normal, at least not for a normally sized boat with appropriate power, usually your speed would be impacted far worse. I'm surprised you only lost 2 km/hr.
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Old 06-08-2022, 08:38 AM
Freedom55 Freedom55 is offline
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All questions are 'quick.' It's the answers that take time.
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Old 06-08-2022, 08:54 AM
tool tool is offline
 
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If you need it explained it more direct terms,

FORCE=MASS X ACCELERATION

The force being constant (the output of your motor) if we change the variable Mass by adding two women to your boat acceleration must therefore be less and your boat just won’t go as fast.

Does that help?
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Old 06-08-2022, 10:29 AM
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fish99 fish99 is offline
 
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elevation of the lake is the biggest loss of power you will experience . a 150 hp will be like a 115 , on a high mountain lake compared to a southern res
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Old 06-08-2022, 10:46 AM
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Twisted Canuck Twisted Canuck is online now
 
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Quote:
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You two are the reason I hardly post any more. All I’m asking is for some advice. Not to be made fun of or ridiculed. Thank you to everyone else. I appreciate your help. Moderators please close this thread. Didn’t know I was in Elementary school again.
Thread is closed as per request. I hope you did get at least some useful information to your question.
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