I found this a few Years ago Gazza, you can use it to find the weight of the boat.
You could also use it to find the weight of the boat plus trailer by using two jack stands to change the pivot point of the whole rig instead of just the boat on its own.You can weigh the boat with a regular household scale using simple math and physics.
1. First put the scale under the tongue with the boat pulled all the way up on the trailer. For me the scale read 150lbs so W1=150
2. scoot the boat back on the trailer EXACTLY 10" so 10=X
3. reweight the tongue. For me it was 100lbs so W2=100
4. measure the distance in inches from the axle to the tip of the tongue. For me it was 180". so 180=C
5. Plug all 4 of your numbers into the equation. C(W1-W2)/X
Mine looked like this... 180(150-100)/10
6. do the equation
a. first you subtract 100 from 150 which = 50
b. then you multiply 50 by 180 which= 9000
c. finally you divide 9000 by 10 which = 900
So my boat weighs 900 lbs. It will only take you about 5-10 minutes to do.
For your "pressure scale" to work you would also need to know the cross sectional area of the jack cylinder.
I've also read of people using area of the tyre foot prints then factoring in the tyre pressures to work out the weight of the whole rig.
IE: Let's say your tyre footprint is 6" long and 5" wide ---> = 30 square inches
and your tyre pressure is 55 PSI
then the weight that tyre is supporting is 30 x 55 = 1650 Lbs. (748 Kgs)
Shakey i bought them off of ebay for that very reason lol cost me about $100 i'll never get back
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Thanks for posting that Fed seems li ke a lot of maths i am hopeless at maths so i would probable screw it all up i am also unable to move the boat on trailer
I missed the shop today needed to buy a 3000 to 5000 psi pressure gauge for the jack decided i only need 2 jack stands and the one pressure gauge jack and take 3 measurements, it is quiet simple my jacks ram measures 34mm in diameter which is 1.34 inches square u take this number and times it by the psi rating on the jacks pressure gauge and it gives u pounds of weight than just convert to kilos
Really wanted to do it over the weekend but being friday i missed rs online think they closed about 3:30pm tried looking for a gauge to pick up on gumtree but not easy finding that high of a psi range
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Hey Dig the hatch above the tank will be removable also it will be constantly aired out as the filler for the tank will protrude into the small bilge pocket where there will be fresh air access, i donno if excess moisture from rain getting into the tank will be a problem but i am hopping it flushes out any salt that may splash in the cavity
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Holly molly i just down loaded google earth my boats and trailer stand out like dogs balls i could scan my whole area in 15mins for houses with boats for criminals to possibly steal
Wow that is a bloody shame
That may be how those young guys found my house the other month!
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Don’t get paranoid Gazza. No one is using google earth to find boats and cars to pinch. It’s not live.
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Still has my boat on the drive away from five years ago at my last place.
Don't waste your time and money Gazza your thinking is all wrong.I missed the shop today needed to buy a 3000 to 5000 psi pressure gauge for the jack decided i only need 2 jack stands and the one pressure gauge jack and take 3 measurements, it is quiet simple my jacks ram measures 34mm in diameter which is 1.34 inches square u take this number and times it by the psi rating on the jacks pressure gauge and it gives u pounds of weight than just convert to kilos
Do you really need to weigh anything or is it just a diversion?
Personally I would just go to a weigh bridge, pay my $30 and be done with it, and that would give you your tow ball weight and the other required weights accurately.
theres a weigh bridge 5 mins from your place at the grain silos in the st marys industrial estate
$24 last time i went there took 5 mins
drive on unhook trailer pull forward go inside get certificate and come back out and hook the car up and go
Fed i bought two 39mm axles before i waste time welding on the brake ears and installing them i want to know the weight of the boat as those 39mm axles will only be rated to 1500kg gtm while the axles are still new i can still get some money back on them to buy 40mm square axles whick will be rated to 2000kg gtm
Google maps shows a car i had 5 years ago in the driveway but google earth shows everything my trailer and two boats
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Forgot to add the boat cannot be moved at this point its sotting on the bunks nothing holding it down, the trailer is filled with rust big holes etc.. the tow hitch just sits on the ball it doesnt lock down
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Just remembered i had a bunch of oxy gear stored away in the shed i remember there being a set of gauges i just went and checked i think i seen 3 sets of regulators took off a high kpa gauge put it on my pressure jack and it worked, back left of trailer lifted so left side wheels off the ground came in at 5000kpa / 725 psi or 1000kg in weight, square diameter of jack piston is 1.38" × psi = pounds ÷ 2 = kg
Think im in a bit of shit with my trailer design
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Worked ot out wrong it came out at 1000lb 450kg my bad cant edit post on mobile
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