The Zip is on the NILE, Egypt

Outboard designs up to 14'

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Ayman
Posts: 34
Joined: Thu May 10, 2018 8:54 pm
Location: Cairo, Egypt

The Zip is on the NILE, Egypt

Post by Ayman » Sat Jun 09, 2018 9:07 am

Hello boat builders

I'm buying the bolts to connect the keel with stem and the keel to the transom. it is stated in the zip bill of materials as follows
5/16" x 6" - 2 ea (Stem to keel)
5/16" x 6" - 4 ea (Transom keel)
1/4" x 2 or 2 1/2" - 6 ea (deck beams)

After studying the drawings carefully I noticed that the length of the bolts in the bill is too long. stem to keel doesn't require more that 3 inch, specially and even maybe shorter of decide to embed the head of the bolt and the nut inside the wood.

anyone to correct me if I'm wrong?
The Prof

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BarnacleMike
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Re: The Zip is on the NILE, Egypt

Post by BarnacleMike » Sat Jun 09, 2018 9:49 am

I just bolted my keel to the stem this morning. I used 3-1/2 inch bronze carriage bolts, and they worked fine.

Keep in mind that my keel is laminated, and the thickness of the keel at the forward end is only 5/8 of an inch. Still, 3-1/2 inch bolts should be fine if they are countersunk into a 1-inch thick keel.
-Michael

Built Utility "Perseverance" — completed Aug 2016
Currently building a Zip
My Boatbuilding Blog: http://barnaclemikeboats.blogspot.com/
My Website of Boat Photos: https://michaelsmaddox.wordpress.com

Ayman
Posts: 34
Joined: Thu May 10, 2018 8:54 pm
Location: Cairo, Egypt

Re: The Zip is on the NILE, Egypt

Post by Ayman » Sat Jun 09, 2018 1:48 pm

Thank you micheal. Have you used 2 bolts keel to stem?
Have you bolted the keel to transom yet? If yes what size of bolts did you use?
The Prof

JimmY
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Re: The Zip is on the NILE, Egypt

Post by JimmY » Sat Jun 09, 2018 2:55 pm

You can always cut down longer bolts. If you are embedding countersinking the bolt head and nut in the wood, go ahead and buy shorter bolts. If you are going to burry the bolts in epoxy, use bronze or double hot-dipped galvanized. Stainless will corrode in the absence of air. I used double hot dipped galvanized, cut to length and covered in epoxy.
-Jim
Nothing says poor craftsmanship like wrinkles in your duct tape!

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BarnacleMike
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Re: The Zip is on the NILE, Egypt

Post by BarnacleMike » Sat Jun 09, 2018 7:18 pm

Ayman wrote:Thank you micheal. Have you used 2 bolts keel to stem?
Yes, I did use 2 bolts for the keel-to-stem joint. Here is a photo from the side, showing the 3-1/2 inch bolts and how far they protrude through the stem. The thickness of the keel here is approximately 5/8 inch.
Attachments
DSC_2818.jpg
-Michael

Built Utility "Perseverance" — completed Aug 2016
Currently building a Zip
My Boatbuilding Blog: http://barnaclemikeboats.blogspot.com/
My Website of Boat Photos: https://michaelsmaddox.wordpress.com

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BarnacleMike
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Re: The Zip is on the NILE, Egypt

Post by BarnacleMike » Sat Jun 09, 2018 7:23 pm

Ayman wrote: Have you bolted the keel to transom yet? If yes what size of bolts did you use?
I test fit it and drilled the holes tonight. I haven't attached it permanently yet, but here is a photo of it bolted to the keel and transom. These are 5 inch bronze carriage bolts. The depth of my transom and motor board at this point is approximately 1-3/8 inch. (I will be adding more layers of plywood to the transom later in the project.)
Attachments
DSC_2819.jpg
DSC_2822.jpg
-Michael

Built Utility "Perseverance" — completed Aug 2016
Currently building a Zip
My Boatbuilding Blog: http://barnaclemikeboats.blogspot.com/
My Website of Boat Photos: https://michaelsmaddox.wordpress.com

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BarnacleMike
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Re: The Zip is on the NILE, Egypt

Post by BarnacleMike » Sat Jun 09, 2018 7:28 pm

As you can see, the 5 inch bolts are indeed a little too long. As Jimmy mentioned, I will cut these to a shorter length.

In retrospect, I would have preferred 4-1/2 or 4-1/4 inch bolts.
Attachments
DSC_2824.jpg
Transom knee to transom, lower bolt. (Thicker part of the transom knee)
DSC_2823.jpg
Transom knee to transom, top-most bolt. (Narrower part of the transom knee)
-Michael

Built Utility "Perseverance" — completed Aug 2016
Currently building a Zip
My Boatbuilding Blog: http://barnaclemikeboats.blogspot.com/
My Website of Boat Photos: https://michaelsmaddox.wordpress.com

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BarnacleMike
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Re: The Zip is on the NILE, Egypt

Post by BarnacleMike » Sat Jun 09, 2018 7:31 pm

Here are some more measurements of the 5 inch bolts through the transom knee.
Attachments
DSC_2825.jpg
Transom knee to keel, aft-most bolt. (Thicker part of transom knee)
DSC_2826.jpg
Transom knee to keel, forward-most bolt. (Narrower part of transom knee)
-Michael

Built Utility "Perseverance" — completed Aug 2016
Currently building a Zip
My Boatbuilding Blog: http://barnaclemikeboats.blogspot.com/
My Website of Boat Photos: https://michaelsmaddox.wordpress.com

Ayman
Posts: 34
Joined: Thu May 10, 2018 8:54 pm
Location: Cairo, Egypt

Re: The Zip is on the NILE, Egypt

Post by Ayman » Sun Jun 10, 2018 1:11 pm

JimmY wrote:You can always cut down longer bolts. If you are embedding countersinking the bolt head and nut in the wood, go ahead and buy shorter bolts. If you are going to burry the bolts in epoxy, use bronze or double hot-dipped galvanized. Stainless will corrode in the absence of air. I used double hot dipped galvanized, cut to length and covered in epoxy.
Thank you Jimmy for the advice. I think I will use hot dipped galvanized. It is impossible to find the silicon bronze bolts in Egypt. I think also that I will countersink everything and bury them in epoxy I believe it is more elegant.
The Prof

Ayman
Posts: 34
Joined: Thu May 10, 2018 8:54 pm
Location: Cairo, Egypt

Re: The Zip is on the NILE, Egypt

Post by Ayman » Sun Jun 10, 2018 1:16 pm

BarnacleMike wrote:
Ayman wrote:Thank you micheal. Have you used 2 bolts keel to stem?
Yes, I did use 2 bolts for the keel-to-stem joint. Here is a photo from the side, showing the 3-1/2 inch bolts and how far they protrude through the stem. The thickness of the keel here is approximately 5/8 inch.
Thank you Michael for all the information and the images. was really helpful. I'm couple of steps behind you. watching your progress encourages me a lot. you have an impressive website and blog. I loved it.
The Prof

Ayman
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Joined: Thu May 10, 2018 8:54 pm
Location: Cairo, Egypt

Re: The Zip is on the NILE, Egypt

Post by Ayman » Fri Jun 29, 2018 11:16 am

Hello
I didn't work on the boat for the last two weeks. the first week I was a way with my family diving. it was wonderful I we had a quality time. The last week I was extremely busy with academic activities, some was outside Cairo and required traveling. I can't wait to go back to the swing of things with the boat.

Today I decided to worm up by working on the transom. I couldn't find 18m marine plywood anywhere in Egypt so I took and early decision to use 10m in two layers. today was the first time in my life to mix resin and hardener. I had to determine the amount needed to put the two 10m layers of the transom. I think I did an acceptable job. will wait till the morning to assess the job :)

My target this week is finish the transom and the frames and to put them up on the form. I hope I can fix the chin and the cheer. wish me luck :)
The Prof

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BarnacleMike
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Re: The Zip is on the NILE, Egypt

Post by BarnacleMike » Fri Jun 29, 2018 1:07 pm

It is fine to laminate thinner layers of plywood together. That is exactly what I'm doing on my transom. Just be sure to use marine epoxy.

Although the plans call for 3/4" plywood (19mm), many of us in the U.S build it thicker to 1 inch (25mm).

Good luck! Take your time, and enjoy!
-Michael

Built Utility "Perseverance" — completed Aug 2016
Currently building a Zip
My Boatbuilding Blog: http://barnaclemikeboats.blogspot.com/
My Website of Boat Photos: https://michaelsmaddox.wordpress.com

Ayman
Posts: 34
Joined: Thu May 10, 2018 8:54 pm
Location: Cairo, Egypt

Re: The Zip is on the NILE, Egypt

Post by Ayman » Sat Jun 30, 2018 7:25 am

Hello

I have built the transom this morning. It was not as messy as I expected to be. And also the lamination of yesterday was successful. I'm attaching a photo to show the two layer of plywood. I'm happy with the result.

I still did not cut the 12 degree and 10 degree sides of the transom. I hope that I can make the cuts tomorrow.

Here are some photos
Attachments
Transom Lamination.JPG
Building Transom-4.JPG
Building Transom-1.jpg
The Prof

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sproggy
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Re: The Zip is on the NILE, Egypt

Post by sproggy » Sat Jun 30, 2018 9:03 am

I haven't worried about cutting the angles on my transom following advice from others on here - you'll be fairing all the frames later on anyway and you can do the transom at the same time once it's mounted on the build form.

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hoodman
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Re: The Zip is on the NILE, Egypt

Post by hoodman » Sat Jun 30, 2018 11:32 am

Looks great! That's a good way to get thicker plywood when you don't have access to it.
Matt

Building a Geronimo......!
viewtopic.php?f=2&t=25139

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