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Old 01 October 2012, 07:44   #11
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Boat is currently on the water with no trailer hence I'm hoping we can just take it somewhere with a crane, get it weighed, job done! Previous owner reckons it weighs 4.5 tonnes, I think less. I'm hoping it will be significantly less so it can be transported on a tri axle trailer. Wishful thinking perhaps!
Ah, ok that makes sense.
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Old 01 October 2012, 09:29   #12
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What boat is it Tim?
1930's wooden motor launch!
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Old 01 October 2012, 10:49   #13
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Any modern crane will be able to weigh it.
Not sure about marina straddle carriers though??
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Old 01 October 2012, 18:07   #14
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Tim, try the guys at Trafalgar wharf, I'm pretty sure their forklift weighs everything it lifts. You'll have to get the boat to Pompey though
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Old 02 October 2012, 06:41   #15
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Very approximate method but...

If I slide four pieces of paper under my car tyre (two front/back, two on the sides) they are 100 mm and 165 mm apart respectively, giving an approximate contact area of 0.1 x 0.165 = 0.0165 sq.m

A gauge tells me that the air pressure is 33 psi, or 227535 Pa, so the load on that tyre (Area x Pressure) is approx 0.0165 * 227535 = 3754 N. Divide this by 9.81 gives a load of approx 382 kg for that wheel - probably not far out for a car with 1610 kg curb weight.

Only a ball-park figure but no weighbridge necessary.
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Old 02 October 2012, 07:15   #16
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Originally Posted by HughN View Post
Very approximate method but...

If I slide four pieces of paper under my car tyre (two front/back, two on the sides) they are 100 mm and 165 mm apart respectively, giving an approximate contact area of 0.1 x 0.165 = 0.0165 sq.m

A gauge tells me that the air pressure is 33 psi, or 227535 Pa, so the load on that tyre (Area x Pressure) is approx 0.0165 * 227535 = 3754 N. Divide this by 9.81 gives a load of approx 382 kg for that wheel - probably not far out for a car with 1610 kg curb weight.

Only a ball-park figure but no weighbridge necessary.
But he doesn't have a trailer!
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Old 02 October 2012, 08:39   #17
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If it's a 1930s wooden sportsboat, do you have slinging kit for it?

Simply because you might be able to clip a 4 point harness to a rib on the side of a ferry, but without suitable slinging, you presumably know the best place to sling it and / or have a spreader frame to stop the straps crushing the deck or breaking it's back with the deadweight of the engine as it clears the water?

The straps on the travel hoists in marinas are secured to the lifting gear outboard of the gunwhales, so it's never usually a problem. A crane will be lifting from above the CoG, and by definition the straps will be trying to compress the hull.


Easy enough to weigh the lifting gear / spreader bar separately & subtract.
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Old 02 October 2012, 09:05   #18
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Load cell and Gosport Boat Yard will be your best bet. They have suitable spreaders on their crane.
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Old 02 October 2012, 09:09   #19
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Quote:
Originally Posted by HughN View Post
Very approximate method but...

If I slide four pieces of paper under my car tyre (two front/back, two on the sides) they are 100 mm and 165 mm apart respectively, giving an approximate contact area of 0.1 x 0.165 = 0.0165 sq.m

A gauge tells me that the air pressure is 33 psi, or 227535 Pa, so the load on that tyre (Area x Pressure) is approx 0.0165 * 227535 = 3754 N. Divide this by 9.81 gives a load of approx 382 kg for that wheel - probably not far out for a car with 1610 kg curb weight.

Only a ball-park figure but no weighbridge necessary.
Can't get me 'ed round that one, son, but I daren't ask for further explanation
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Old 02 October 2012, 09:29   #20
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Can't get me 'ed round that one, son, but I daren't ask for further explanation
I was sh*te at maths at school as well
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