Woods Skoota 32DM

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fallguy1000
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Re: Woods Skoota 32DM

Post by fallguy1000 » Thu Feb 28, 2019 10:12 am

There are two 4" tapes going over the bolt head. When you apply the cabosil and milled fiber, if there is too much; it sags amd falls before you get the tapes applied, so on that open edge, I jist taper ita bit. Then there are double tapes there and they are a bit stiff. So the error is about 1/4" or 1/16th or 6%. My tapes are wider than 4", so the error is like 5%

Eberything is done with 26 minite epoxy. So I have 26 minites to do all the fills. Then I go back and wet the tapes and have 26 minites to stir, wetout and apply. In this case 8 tapes. There isn't really time or money to go and fix the 5% error. If ot bothers me, I can jist stick a blob of thixo in from another batch.

Bit to be honest, those tapes are a massive redundancy. I was going to skip them altogether.

See, the beam socket is 9 layers of 1708 there. Then a hole and then the welded head bolt is glued in from underneath. Alone; you might be able to sledge it out. But then we will build and glue a 1" thick piece of fiberglass (64 layers or so) and glue that to the top of the socket woth a bolt hole through it. Then the beam strap goes ober that glass washer and a flat washer and a lock and a nut applied and the nut will be castled and cottered. So, I can't even imagine the tape ever adding amything because in order for it to help; the forces on the strapping would be over 4 square inches and applied to 9 layers of 1708 and across 8 points of attachment. If the 6% error is ever a factor; the seastate would be so violent, the cat would probably capsize first.

The tapes were specified prior to the 4" glass washer plan. I did them as a matter of semantics now.

When the boat is done; you could hook a chain or cable to one of the beam straps and pick the whole boat up with a crane. The tensile and shear ratings are that high. And the tapes in question do nothing. On the other hand, if you put a weight on the thread end of the bolt amd increase it to failure, the failure would be shear of the beam socket. It could be calculated and would by 9 layers of 1708 over 4 square inches less the bolt.

The lower of in plane or vertical shear isabout 18,800 psi and it would be spread over 3.5" or about 60,000 pounds to fail on a single bolt. The bolt rating is 100,000 psi over an approximate minor of 7mm or about 25,000 pounds. So, the stud fails before the socket and in order for the tapes to help; you need about 60,000 pounds of force.

So, the bolt would bend before the boat breaks, at least theoretically, the beam socket is twice as strong as the bolt.

All that said, the beams do need reseating to help them avoid rotational movements.


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piperdown
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Re: Woods Skoota 32DM

Post by piperdown » Thu Feb 28, 2019 11:30 am

Holy crap! 8O I went back and looked at when you were doing the beam sockets glass. Redundant tape indeed!
Eric (aka, piperdown)

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fallguy1000
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Re: Woods Skoota 32DM

Post by fallguy1000 » Thu Feb 28, 2019 12:14 pm

Deck rough fit n ready for radius n rebates.
789A80DC-995C-4BA4-BBD5-D20EB3EF9F8E.jpeg
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viewtopic.php?f=12&t=62495

fallguy1000
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Re: Woods Skoota 32DM

Post by fallguy1000 » Thu Feb 28, 2019 12:50 pm

Rebates and reliefs drawn.
D11BC63D-BC3B-4B27-B1CF-8E567AB6E905.jpeg
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Biney777
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Re: Woods Skoota 32DM

Post by Biney777 » Thu Feb 28, 2019 2:11 pm

fallguy1000 wrote:
Thu Feb 28, 2019 10:12 am
There are two 4" tapes going over the bolt head. When you apply the cabosil and milled fiber, if there is too much; it sags amd falls before you get the tapes applied, so on that open edge, I jist taper ita bit. Then there are double tapes there and they are a bit stiff. So the error is about 1/4" or 1/16th or 6%. My tapes are wider than 4", so the error is like 5%

Eberything is done with 26 minite epoxy. So I have 26 minites to do all the fills. Then I go back and wet the tapes and have 26 minites to stir, wetout and apply. In this case 8 tapes. There isn't really time or money to go and fix the 5% error. If ot bothers me, I can jist stick a blob of thixo in from another batch.

Bit to be honest, those tapes are a massive redundancy. I was going to skip them altogether.

See, the beam socket is 9 layers of 1708 there. Then a hole and then the welded head bolt is glued in from underneath. Alone; you might be able to sledge it out. But then we will build and glue a 1" thick piece of fiberglass (64 layers or so) and glue that to the top of the socket woth a bolt hole through it. Then the beam strap goes ober that glass washer and a flat washer and a lock and a nut applied and the nut will be castled and cottered. So, I can't even imagine the tape ever adding amything because in order for it to help; the forces on the strapping would be over 4 square inches and applied to 9 layers of 1708 and across 8 points of attachment. If the 6% error is ever a factor; the seastate would be so violent, the cat would probably capsize first.

The tapes were specified prior to the 4" glass washer plan. I did them as a matter of semantics now.

When the boat is done; you could hook a chain or cable to one of the beam straps and pick the whole boat up with a crane. The tensile and shear ratings are that high. And the tapes in question do nothing. On the other hand, if you put a weight on the thread end of the bolt amd increase it to failure, the failure would be shear of the beam socket. It could be calculated and would by 9 layers of 1708 over 4 square inches less the bolt.

The lower of in plane or vertical shear isabout 18,800 psi and it would be spread over 3.5" or about 60,000 pounds to fail on a single bolt. The bolt rating is 100,000 psi over an approximate minor of 7mm or about 25,000 pounds. So, the stud fails before the socket and in order for the tapes to help; you need about 60,000 pounds of force.

So, the bolt would bend before the boat breaks, at least theoretically, the beam socket is twice as strong as the bolt.

All that said, the beams do need reseating to help them avoid rotational movements.
Ok, fine! You have me convinced. Yes, I will be willing to crew for you on your first crossing... :wink: Seriously, I am humbled by the level of knowledge on this forum, and immensly grateful that you take the time to explain things fully.
Completed Danny Greene "Chameleon" a 10 1/2' nesting/rowing/sailing dinghy. Building an Alexa's Rocket 15 w/ optional retractable spinnaker pole.

fallguy1000
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Re: Woods Skoota 32DM

Post by fallguy1000 » Thu Feb 28, 2019 4:11 pm

Two more small hull panels in the bag. We used 51 oz of epoxy and about half will exit.
1487C3C4-1E93-4C38-B848-158524D8F278.jpeg
My boat build is here -------->

viewtopic.php?f=12&t=62495

TomW1
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Re: Woods Skoota 32DM

Post by TomW1 » Thu Feb 28, 2019 8:31 pm

Fallguy things are looking good. Any chance of a wide angle shot wit a 24mm lens to show the whole build. It has been hard to follow your build as you have not shown wide angle shots. But I have sur appreciated the shots you have given us
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

Fuzz
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Re: Woods Skoota 32DM

Post by Fuzz » Thu Feb 28, 2019 9:10 pm

What Tom said :D

fallguy1000
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Re: Woods Skoota 32DM

Post by fallguy1000 » Fri Mar 01, 2019 12:19 am

TomW1 wrote:
Thu Feb 28, 2019 8:31 pm
Fallguy things are looking good. Any chance of a wide angle shot wit a 24mm lens to show the whole build. It has been hard to follow your build as you have not shown wide angle shots. But I have sur appreciated the shots you have given us
I have a top down view camera, but lost interest in it quickly.

I can try to fire it up I suppose.

Don't know much about the 24mm lens. I guess there are some iPhone gadgets you can use to do it..
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TomW1
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Re: Woods Skoota 32DM

Post by TomW1 » Fri Mar 01, 2019 3:03 pm

A 24mm lens is super wide angle on a 35mm camera. I use a 24-75 zoom and then a 75-300zoom for my two lens on my Canon EOS camera. These were purchased from Canon or a high quality retailer. All lenses meet Canon's quality specs. I will stand on any pics that I post on here. Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

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