24" vs 25" tubes? - Mountain Buzz
 



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Old 09-12-2013   #1
 
Angel Fire, New Mexico
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24" vs 25" tubes?

How much do you gain from switching from 16' X 24" tube to 16' X 25" tubes?

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Old 09-12-2013   #2
 
pocatello, Idaho
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Old 09-12-2013   #3
 
pocatello, Idaho
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that is for an circumference going from 24 to 25.

For diameter you would get....about 8% ha ha.

so a 1500lb capacity goes to 1620 lbs. Not that much unless you are right on the edge of capacity.
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Old 09-12-2013   #4
 
Calgary, Alberta
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LOL!

Actually you'd want area (pi * r * r) since the length is the same for the volume calculation)...

= 1962.5/1808.6 = about 10.5% more volume
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Old 09-12-2013   #5
 
Angel Fire, New Mexico
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So Sotar told me that their recommended load capacity of the 16' X 25" tubes is 975lbs. Seems a little light. Thoughts?
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Old 09-12-2013   #6
 
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Originally Posted by backwardsraft View Post
So Sotar told me that their recommended load capacity of the 16' X 25" tubes is 975lbs. Seems a little light. Thoughts?
I think my Maravia 14 X 24 is 980 lb.if I remember right.
All that math makes my head hurt
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Old 09-12-2013   #7
 
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Originally Posted by fiya79 View Post
that is for an circumference going from 24 to 25.

For diameter you would get....about 8% ha ha.

so a 1500lb capacity goes to 1620 lbs. Not that much unless you are right on the edge of capacity.
Tubes Are not spec'd in circumference. If so, 25" would be a circus clown balloon

The diam changes by 4%, not 8. Volume is a rough function of cross sectional area, so your area would increase by 1.04^2 or 8% more volume in the completely cylindrical part of the tube

If Sotar says less than 1000lb then I would believe them. If there is a lot of rocker then you will have a short waterline, maybe 9 or 10'. People think you can load up a cat but I wouldn't knowingly exceed 1200lb on my leopard and that has 18x26.5 tubes

Mostly cause I don't want to put my self in a situation where I can't maneuver it and have to figure out how to unpin the boat
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Old 09-12-2013   #8
 
East of the Pine beatle, Colorado
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Which Sotar design? I went from a 19" to 23"x 14' Sotar ST this year- Big difference, but maybe not quite as much as I originally thought it would be. I wouldn't think you'd notice a difference between the two-
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Old 09-12-2013   #9
 
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Which Sotar design? I went from a 19" to 23"x 14' Sotar ST this year- Big difference, but maybe not quite as much as I originally thought it would be. I wouldn't think you'd notice a difference between the two-
That's a 46% increase in cross sectional area

Like going from 24 to 29"
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Old 09-12-2013   #10
 
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Quote:
Originally Posted by cataraftgirl View Post
Quote:
Originally Posted by backwardsraft View Post
So Sotar told me that their recommended load capacity of the 16' X 25" tubes is 975lbs. Seems a little light. Thoughts?
I think my Maravia 14 X 24 is 980 lb.if I remember right.
All that math makes my head hurt
That's what I was telling you about weight ratings. Maravia gives "max optimal" weight ratings, allowing for 1/3 of the tube to be submersed. If you take 15-20% of that weight off it'll perform like Papushka the dancing bear!
And that likely gets you into the weight range that Sotar is recommending.

As for diameter, BackwardsRaft, the design of the tubes plays a huge role too. NRS or AIRE Lion tubes are also 25" and carry a lot more weight because they are full diameter for much more of the length and have a longer water line to support the weight. They just won't be as sporty, even loaded lightly.
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