Hull support after flip?

Power Boats only. Please include the boat type in your question.
GuyP
Active Poster
Active Poster
Posts: 256
Joined: Thu Apr 05, 2018 2:01 pm
Location: Atlanta, Ga

Hull support after flip?

Post by GuyP » Sun Aug 18, 2019 1:19 pm

I’ll be flipping my FS19 build in a few weeks. Many builders have flipped right onto a trailer. With molds removed and frames not yet in place will the hull bottom have enough support to hold it’s designed shape on trailer bunks while stringers, frames and bulkheads are secured? I saw somewhere that sheer shape may have to be adjusted with ratchet straps to secure shape prior to frame, gunnel, bulkhead installations.

Thanks
Attachments
2555965E-8B95-4687-BF55-0BBA86473715.jpeg



narfi
* Bateau Builder *
* Bateau Builder *
Posts: 1541
Joined: Tue Jun 07, 2016 6:55 pm
Location: Bush Alaska

Re: Hull support after flip?

Post by narfi » Sun Aug 18, 2019 2:23 pm

I built my fs17 hull in my wife's dining ring room over the winter and flipped in the spring.

We lifted it up off the jig and went out the garden doors at an angle and up over the railing and onto the lawn. There we flipped it unsupported with no issues and moved it into the boat building tent.

I think if one person is trying to flip solo with straps it probably needs more support than if you have a half dozen guys doing it by hand. The straps concentrate the stresses where multiple people spread that load out and make it easier.

fallguy1000
Very Active Poster
Very Active Poster
Posts: 4280
Joined: Tue Jan 12, 2010 12:25 am

Re: Hull support after flip?

Post by fallguy1000 » Sun Aug 18, 2019 3:59 pm

You'll know when you walk in it if you think you bunked it well enough.

For my build, I made the entire think walkable. Different boat, but walkable was important.
My boat build is here -------->

viewtopic.php?f=12&t=62495

jtdums
Active Poster
Active Poster
Posts: 293
Joined: Thu Oct 25, 2012 10:15 am
Location: United States
Location: Davidson, NC

Re: Hull support after flip?

Post by jtdums » Mon Aug 19, 2019 8:16 am

I don't flip onto a trailer because I don't want the trailer to be in my way while doing interior. Also, the working height is determined by the trailer.
Instead, I like to make a very simple "cradle" out of plywood and pipe insulation that retains the hull shape for after the flip. This is attached to the original stongback after flip. The "cradle" is templated and cut before the flip while the hull is still attached to the station molds and upside down. On a small hull I usually do this at two points about equally spaced along the hull.

After the flip I ensure there is sufficient support along the length of the keel before doing any interior work and I keep my weight as centered as possible until the interior fiberglassing is completed.

I will try to find a picture.
Sanding is cathartic...

fallguy1000
Very Active Poster
Very Active Poster
Posts: 4280
Joined: Tue Jan 12, 2010 12:25 am

Re: Hull support after flip?

Post by fallguy1000 » Mon Aug 19, 2019 8:20 am

Nice to use a strongback.

Tapcon them to the floor with 2x cleats.

Once we flipped and reflipped the Skoota; we built a wooden cradle for it.

Now, we built a wooden trailer.
My boat build is here -------->

viewtopic.php?f=12&t=62495

Chuck H
Frequent Poster
Frequent Poster
Posts: 127
Joined: Mon Aug 25, 2014 7:43 pm
Location: Mesquite, Tx

Re: Hull support after flip?

Post by Chuck H » Wed Aug 21, 2019 12:01 am

Guy,

I'm assuming the FS19 is a scaled up FS17. I don't think any normal trailer would support the unfinished hull very well. at least without elaborate modifications to the bunks. The variable deadrise (I think that's the right term), means there's no flat planes to lay flat on the bunks.

I built a cradle on the bottom of the hull before i flipped it and then bolted the cradle to the remains of my strongback.

Image

Image

Image

seemed to work pretty good

Image

Chuck

GuyP
Active Poster
Active Poster
Posts: 256
Joined: Thu Apr 05, 2018 2:01 pm
Location: Atlanta, Ga

Re: Hull support after flip?

Post by GuyP » Wed Aug 21, 2019 12:21 am

Chuck you are correct 19 is scaled up 14%. I will do something similar to your support method. Thanks

Browndog
* Bateau Builder *
* Bateau Builder *
Posts: 1017
Joined: Sat Jun 04, 2016 7:38 am
Location: Shellman Bluff, GA

Re: Hull support after flip?

Post by Browndog » Wed Aug 21, 2019 6:55 am

Congratulations Guy on being near the flipping stage. Well done.

Lots of different approaches to how to flip and what to do next. Do what works best in your situation.

The FS 19 I built went right on its trailer and everything worked fine.

Looking forward to what you do in the interior.

Salty F17
Active Poster
Active Poster
Posts: 341
Joined: Wed Aug 15, 2018 3:33 pm
Location: LA

Re: Hull support after flip?

Post by Salty F17 » Wed Aug 21, 2019 7:43 am

I also just flipped i have a very good documentaion on the process (pics, and videos) check out my build maybe some help to u the link to my build is at the bottom .good luck with your flip
Check out my build----C17---- hit the link viewtopic.php?f=2&t=63575

nathan
Frequent Poster
Frequent Poster
Posts: 71
Joined: Sat Sep 08, 2007 9:11 pm
Location: mid GA

Re: Hull support after flip?

Post by nathan » Thu Aug 22, 2019 5:36 am

I supported my FS17 about the same as Chuck did his. Worked good. That was about 11 years ago
normal_IMG_0127.JPG
normal_IMG_0127.JPG (31 KiB) Viewed 2363 times
Oh I was up in your end of Lake Sinclair week before last cruising around breaking in a new Tohatsu 60hp.

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests