Boat weight?

jssailem · Oct 9, 2017

marchem said:
Or maybe the spec is low, and the travel lift reads high?

I heard that is what sumo wrestlers say at weigh in.

shemandr · Oct 9, 2017

That's almost an extra keel! Time for a diet. Take everything off - all of it. Put back only what you actually use. Your boat is in the water all year? Maybe run a dehumidifier for a few days with the cabin closed up. You'll suck
out a few hundred pounds.
"Or maybe the spec is low, and the travel lift reads high?"
That's pretty much what I say every morning when I weigh myself.

Meriachee · Oct 9, 2017

Gravity doesn’t change at an angle. Either the gauge was out of whack, or the boat is that heavy.
They don’t charge the lift by pounds? Kinda like the grocery store spraying the broccoli every 87 seconds and then charging the weight.

vhoisington · Oct 9, 2017

Well add in the weight of existing fuel, water and waste tanks (water weights about 7.62 lbs per gallon, diesel is a little less and holding tanks are the same as water weight) all electronics, sails, etc and you might be surprised.

But yes, this does sound a little high for your boat

rpwillia · Oct 9, 2017

At haul out a few ago a crane operator I trust told me 15,500. I need to paint it in vertical stripes as they are slimming.

Ron20324 · Oct 9, 2017

My B323, 32'10", for several haulouts is 13,000. It's pretty well equipped.

Meriachee · Oct 9, 2017

marchem said:
Actually the angle does matter. If the straps are pulling at a 45 degree angle the load (which is being measured) is much more than the actual weight. At 90 degrees the load becomes essentially infinite.

Really? A pound is a pound is a pound. If you're going to tell us that the straps in the travellift were at a 45 degree angle, I would think that you'd be a lot more concerned about the security of the load (your boat) than the weight.

JamesG161 · Oct 9, 2017

Hold the horses...
Almost all big weighing scales, fork lifts, cranes, etc. use "strain cells" and are good to maybe 3 digits of precision.
So to make a lift safely, all crane lift points have a strain cell and are SUMMED for Total Weight.

If that is NOT true, stop using that lift. UNSAFE!!!

If that lift has not recently calibrated their strain cells [by license and law they must]
Lookout boat!

ANGLE of the straps has ZERO to do with total weight. However the Angle of lift, of a single boom crane, is key to prevent "tipping".

If those strains cell said 16,000 lbs and they were calibrated correct, then your boat weight is 16k ±1k precision.
______
Trivia: Fresh water at room temperature weighs ≈8.33 lbs/gallon. Good marine diesel is ≈ 7.1 lbs/ gallon
Crap diesel is heavier ≈7.9 lbs/gallon . You grade diesel by its specific gravity at 15.6 C°.

Jim...

PS: Diesel is lighter than water, doesn't mix with water and it Floats on water.

Meriachee · Oct 9, 2017

Not to mention that if the boat gets heavier when it’s angle off vertical increases, how much heel would be required to send it to the bottom?

JamesG161 · Oct 9, 2017

shemandr said:
That's pretty much what I say every morning when I weigh myself.

Quit eating so much Lasagna!!

I stopped weighing in morning and eat more spaghetti!

Jim...

PS: Quit using your wife's Birthday party as an excuse.

Ralph Johnstone · Oct 9, 2017

marchem said:
At 90 degrees the load becomes essentially infinite.

I believe the mass of the boat becomes infinite only as it approaches the speed of light.

vhoisington · Oct 9, 2017

Thanks for the correction on my weights. I keep mixing diesel and water. No wonder I have engine issues (not really but I do want to note the correction on my misinformation)

JamesG161 · Oct 10, 2017

marchem said:
The spec for the displacement is only 10,300 lbs.

OMG

Make a note to self....

"Don't make a strong case on SBO without 2 cups of coffee"

Boat Displacement Weight is NOT Total weight of the boat!

Displacement weight = Weight of Water Displaced when the boat is....

Floating!!

Whew! Boat lift is probably safe.
Jim...

PS: Fat floats.

JamesG161 · Oct 10, 2017

marchem said:
The load gets huge, but the mass stays the same, as long as it moves slowly.

Captain Kirk to Sulu: Warp 2 Mr. Sulu...
Mr Sulu: But Captain won't we go to infinite mass at 4 times the speed of light?
Captain Kirk to Mr Sulu: Remember your training? Warp drives bend space thus avoiding relativity mass.

Captain Kirk to Log: Remind me to beam Mr. Sulu to the next Class M planet, first!

Jim...