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27-11-2012, 01:41 PM
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#1
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Weighing you boat on its trailer.
Little formula Ive found for weighing your boat on its trailer!
Put a scale under the nose of the trailer/ jockey wheel and record the weight (W1), slide the boat back by a measured amount (X), record the nose weight on the trailer (W2). Measure the distance from the ballance point on the trailer/axle to the point you placed the scale (C).
W1 = first (heavier) scale reading in lbs, W2 = second scale reading in
lbs, X = the distance you shifted the boat in inches, C = distance between
trailer axle and scale point in inches.
The formula is Boat Weight = C (W1-W2)/X
Note, this will only work for single axle trailers, can use it on twin axle trailers if you take one pair of wheels off!
Just thought people might be interested in it!
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27-11-2012, 01:52 PM
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#2
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Registered User
Join Date: Mar 2004
Posts: 6,891
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Nice one. 
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24-10-2013, 01:56 PM
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#3
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Registered User
Country: In the UK, in my office, working, waiting to go boating.
Occupation: Chartered Engineer
Interests: boats, water, snow, football
Boat name: “DoubleSix”; “Blue Lias”
Boat make: Ring 21c; Pacemaker 21
Engines: Opti 200; twin Volvo AQ110s
Cruising area: Lyme Bay
Join Date: Aug 2012
Posts: 138
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Quote:
Originally Posted by Hydrostream
Little formula Ive found for weighing your boat on its trailer!
Put a scale under the nose of the trailer/ jockey wheel and record the weight (W1), slide the boat back by a measured amount (X), record the nose weight on the trailer (W2). Measure the distance from the ballance point on the trailer/axle to the point you placed the scale (C).
W1 = first (heavier) scale reading in lbs, W2 = second scale reading in
lbs, X = the distance you shifted the boat in inches, C = distance between
trailer axle and scale point in inches.
The formula is Boat Weight = C (W1-W2)/X
Note, this will only work for single axle trailers, can use it on twin axle trailers if you take one pair of wheels off!
Just thought people might be interested in it!
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This is really good. Going back through the Technical Q&A this question comes up with predictable regularity. I am as much a culprit as anyone else having asked the question only a month ago!
I am an engineer by profession and am a little embarrassed that I didn't think of this myself. But I have been through it and checked the theory and the maths. Even the weight of the trailer doesn't need to be considered even though you are weighing it, it only returns the weight of the boat and engine (i.e. all the bits that you move forwards or backwards)!
So, This is bumped back to the top for everyone's convenience; and if anyone finds the maths difficult (brackets and all that), I have created a little spreadsheet that will do it all for you. It has a labelled diagram, you just have to type in some numbers and it doesn't even matter which measurement you take first - and then move the boat forwards, or backwards.
PM me if you'd like a copy.
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24-10-2013, 07:48 PM
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#4
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Registered User
Join Date: Oct 2007
Posts: 1,374
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Or put some scrap metal in the boat take it to your local metal recycling yard and they will weigh it for you on the way out
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25-10-2013, 08:33 AM
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#5
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Registered User
Country: In the UK, in my office, working, waiting to go boating.
Occupation: Chartered Engineer
Interests: boats, water, snow, football
Boat name: “DoubleSix”; “Blue Lias”
Boat make: Ring 21c; Pacemaker 21
Engines: Opti 200; twin Volvo AQ110s
Cruising area: Lyme Bay
Join Date: Aug 2012
Posts: 138
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Quote:
Originally Posted by hunton69
Or put some scrap metal in the boat take it to your local metal recycling yard and they will weigh it for you on the way out
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According to this forum there are a lot of people with Scrap metal already attached to the back of their boats. 
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25-10-2013, 09:34 AM
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#6
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Registered User
Join Date: Sep 2007
Posts: 513
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What's the going rate for Jap aluminium? 
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25-10-2013, 11:08 AM
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#7
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Quote:
Originally Posted by Marinautic
What's the going rate for Jap aluminium? |
Seems I have a lot more american ali than any other! 
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