Anyone know all things boat ???

[D4570]

Ok it sounds dumb, but.
I'm adding foam flotation to the waterbug. 7'x14' 950 pounds catrermeran style airboat
2- 30"x31"x26" one in each cat along side the motor in back.
26"x 5''x 13 feet. down the middle between the cats,and the two aluminum pods added in back .There roughly 6"x20"x15". That's 72,100 Cubic inches.
41.72 cubic feet. That would displace 41.72 cf or water which is 2603 pounds.
I want to see if that will hold it up.
If I backed it in on the trailer and sunk the boat then un hooked the tie downs but keep the trailer under it with a bow rope and maybe
on the sides too to keep it from rolling.
Then what? If it floats or sinks to the trailer, do you think the trailer would hold the weight when I take it out? There is no extra weight on the trailer in the water , right?
I'd keep the motor mostly out of the water then pump it out.
To crazy ?

 

[Elkmagnet]

To crazy, for most boat trailers i have been around anyway. You would be better off to weight the boat and do the math. Also position the flotation where the weight is like by the motor. Otherwise she will flip. Although it will probably flip anyway with the high motor.
Uhhhh, good luck!

 

[JTHOMP]

Sounds like a solid way to test it, but sounds like an idea that could go south realllllyyyyy quick. If you do just make sure someone is filming so can join the history books of boat launch fails.

 

[Pondera]

Only one way to truly find out...

 

[D4570]

Thanks for all the HELP guys!!!

 

[thusby]

I feel weird when I wander into these things, I'm a naval architect by trade.
If your displacement is greater than your weight, you will float. You can calculate the draft by simple formula if you know the weight. Total weight (LT) = (Cb*Length (ft)*Width (ft)*Draft(ft))/36 (ft3/LT). Cb is the block coefficient which is the volume of the hull divided by a rectangle that encompasses the hull. In your case probably use 0.8 or so. LT is long ton which is 2240 lbs.
Doing quick math on what I have I would say you are going to draft about 2-3/8", which is not very much for a vessel your size. If that is the case, I would be more concerned with your vertical center of gravity and destabilizing the vessel.

 

[hank4elk]

" A boat is a whole in the water to throw money in"
Ex boat owner...

 

[crock239]

" A boat is a whole in the water to throw money in"
Ex boat owner...

"....and the bigger the boat the bigger the hole." - current SMALL boat owner

 

[D4570]

" A boat is a whole in the water to throw money in"
Ex boat owner...

Dang I have 3

 

[D4570]

I feel weird when I wander into these things, I'm a naval architect by trade.
If your displacement is greater than your weight, you will float. You can calculate the draft by simple formula if you know the weight. Total weight (LT) = (Cb*Length (ft)*Width (ft)*Draft(ft))/36 (ft3/LT). Cb is the block coefficient which is the volume of the hull divided by a rectangle that encompasses the hull. In your case probably use 0.8 or so. LT is long ton which is 2240 lbs.
Doing quick math on what I have I would say you are going to draft about 2-3/8", which is not very much for a vessel your size. If that is the case, I would be more concerned with your vertical center of gravity and destabilizing the vessel.

The draft I already worked out I think, It's when Its FULL of water is when the foam starts to work.

 

[dirtclod Az.]

Nighty night termite... Did It last month.Never ever taking that boat
out again.

 

[JTHOMP]

" A boat is a whole in the water to throw money in"
Ex boat owner...

BOAT- Break Out Another Thousand

Recently purchased a second one because I needed a smaller boat and motor to get into difficult places and can’t paddle against current with the pirogue. Come October it’ll be worth it....as long as I’m not stranded

 

[thusby]

The draft I already worked out I think, It's when Its FULL of water is when the foam starts to work.

Haha, I can't help here.

 

[Sytes]

" A boat is a whole in the water to throw money in"
Ex boat owner...

Every time I'm in the store for boat parts they tell me that's a farce...

D4570, Wish I could help though I've no clue though looking forward to the video.

 

[D4570]

Video.
Water test again.
More work to be done.

 

[LuketheDog]

" A boat is a whole in the water to throw money in"
Ex boat owner...

"The two best days of a boat-owner's life are the day you buy the boat and the day you sell it..."