K2FS18

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jacquesmm
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Re: K2FS18

Post by jacquesmm » Sat Mar 18, 2017 7:51 pm

The FS18, hull and deck, should be less than 300 lbs. I calculate that very accurately measuring each surface and all the tabbing.
It is not juts the plywood sheet and other supplies. For a high tech boat, I assume 50% glass. A 1st time builder will get 33% and the hull would be 350.
Add a console, tanks, rigging (cables, hose, lights and stuff), I think 500 is reasonable.
I would not have a fixed tank on that boat, only portable lights, tiller steering etc. but if you want all that, there will be more weight.

Check your measurement methods, you can do it with a bathroom scale and the boat on the trailer:
http://windmillclass.com/static/weigh.html
or
http://www.boldinventions.com/index.php ... &Itemid=55


Jacques Mertens - Designer
http://bateau.com

K2FS18
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Re: K2FS18

Post by K2FS18 » Sun Mar 19, 2017 3:33 pm

Those are interesting ways to weigh a boat Jacquesmm. Thanks for posting.

K2FS18
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Re: K2FS18

Post by K2FS18 » Sun Mar 19, 2017 3:42 pm

So, the debate may be over. Maybe not.

I redid my original setup making sure I was more vertical on my straps to the scales. The photo below shows the setup. The two rear scales weighed at 190# each and front scale was 60#; giving 440# total.
Image

The second photo I changed the way I weighed. I used the straps to cradle the boat and tried using one scale. I was just a little off on my center so I had to have a scale on the front as well. The rear scale was at 435# and front scale was at 20#; totaling 455#. It would be a good guesstimate that there was at least 15#'s of straps, steel pipe and thing-a-majigies.
Image

So, I betting that she weighs in right around 440 or so.

TomW1
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Re: K2FS18

Post by TomW1 » Sun Mar 19, 2017 8:04 pm

I see where your problem is. Your measuring at the center of the boat with your 2 scales, so they are picking up the weight from the bow to the stern. So 190x2=380 and forget the front scale as it is only holding the point in position. The boat must also be perfectly level along the keel.


Let's do it another way on a spread sheet.

1. Jacques design weight of 250lbs
2 Add any fish tanks +30lbs
3. Fuel tank 6gal 10lbs
Then add anything else you have added.

There is just no way that your FS18 as shown in the pictures weighs 445 pounds.

Another way would be to balance the boat over the Center of Buoyancy which you found earlier.

The FS18 as designed is for a 4" draft at DWL with a Displacement at DWL of 1100lbs. It has a PPI of 280lbs which means that for every 280lbs up or down the draft changes by 1". So don't worry what your weight is now and just finish your build, you continue to over think things. If you want to get a final weight put it on the trailer and take it to a weigh station and subtract the weight of the trailer. There is really nothing you can do about the weight of your boat at this point in time.

Keep on building love watchin your build! :D Tom
Restored Mirror Dingy, Bought OD18 built by CL, Westlawn School of Yacht Desghn courses.

joe2700
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Re: K2FS18

Post by joe2700 » Sun Mar 19, 2017 11:21 pm

I see where your problem is. Your measuring at the center of the boat with your 2 scales, so they are picking up the weight from the bow to the stern. So 190x2=380 and forget the front scale as it is only holding the point in position. The boat must also be perfectly level along the keel.
I think you are over complicating the weight thing Tom, the way OP weighed it there(both ways) the sum of the scales is the weight of the boat as long as the scales are accurate. It doesn't matter where the scales are or how many you use, as long as they are vertical you just sum them all up.

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AmbitiousRookie
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Re: K2FS18

Post by AmbitiousRookie » Mon Mar 20, 2017 7:20 am

I think I would have given up by now and weigh a truck and trailer and hit the local truck,grain or quarry scales. Then I would know which was the right way :lol:

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Re: K2FS18

Post by K2FS18 » Wed Mar 22, 2017 8:39 pm

First coat of color down! This is on 3 coats of S3 yatch primer.
Image

I tried to roll and tip, but the tipping was leaving too deep of lines in the finish. I had that same problem when I painted the sides. Just rolling the paint has it laid down really nicely. I plan on a total of 3 coats. It took 600ml for one. A quart has 935ml. Figures. I only bought one quart for the top sides. Just order a second. Just 2 coats would have required the additional quart.

I will apply the second coat to all the surfaces, then apply the third to the areas not getting nonskid. Let that dry and cure, then tape off and apply the third coat to the areas with the nonskid additive. Will also be painting the rub rail and front thing black.

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Re: K2FS18

Post by Jeff » Wed Mar 22, 2017 9:10 pm

K2FS18, looks good!! Jeff

Dutch1
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Re: K2FS18

Post by Dutch1 » Wed Mar 22, 2017 9:20 pm

Looking good man! You'll be sliming her up soon!

Mikem59
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Re: K2FS18

Post by Mikem59 » Wed Mar 22, 2017 9:36 pm

Very Nice 8) ! You won't be long for the water.

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