Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 17-07-2011, 07:17   #211
Provocateur & Raconteur
 
knottybuoyz's Avatar

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Iroquois, Ontario
Boat: Bateau.com TW31 Modified
Posts: 3,583
Images: 87
Re: And So it Begins . . . Knottybuoyz' New Project

"Give me a lever long enough and a fulcrum on which to place it, and I shall move the world." - Archimedes, Greek Mathematician, 287 - 212 BC

"Give me enough clamps and ratchet straps which to place on it, and I shall stop the world from moving." - Rick Laporte, Amateur Boat Builder, 1960 -

One of the more interesting challenges to this project is laminating two sheets of 1/2" marine plywood together to form the curved transom. That's the reason for the funky transom mold I showed you earlier.



I tried a few different approaches to getting one sheet to conform to the mold. There's a tremendous amount of energy stored up in a sheet of plywood when you try to torture it into a shape it doesn't want to go into! I found that out when I tried to release the ratchet straps after the first trial! Yikes!

Anyhow, I quickly realized (in my dream last night, yeah exciting I know) that I need more grip to wrangle this part into shape. Adding some cleats in the right places are the ticket.



This gave me the advantage I was looking for. Places to put plenty of clamps.



As you can see the plywood now follows the mold pretty well. A few minor adjustments and it'll be perfect.



Some of the guys on the designers forums suggested adding kerfs to the sheets to allow them to bend easier. I never thought of that but it's a good idea, and probably safer too. I'll explore that later.

That's it for now. Off to clean up the old boat. Got a prospective buyer coming to look at it today.
__________________

__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
knottybuoyz is offline   Reply With Quote
Old 17-07-2011, 07:56   #212
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Re: And So it Begins . . . Knottybuoyz' New Project

Good luck in selling your boat.
__________________

__________________
DeepFrz is offline   Reply With Quote
Old 17-07-2011, 09:46   #213
Senior Cruiser
 
Blue Stocking's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,114
Re: And So it Begins . . . Knottybuoyz' New Project

Does that mold become part of the boats transom area construction?
If not, how much extra curvature was designed in to allow for the straightening forces of the ply.
Once did a transom consisting of 3 thicknesses of 3/8" mahogany ply.
Cut the curvature out ot 10Ft lengths of 2 x 12 pitch pine. Bolted the concaved section to the bench, pulled the curve down with the matching convex form, with threaded rod through the forms projected ends.
Using the formula that is used for deck beam curvature, built in 6% extra, graduated across the full width.
The completed transom, at rest, came back very close to drawn shape.
__________________
so many projects--so little time !!
Blue Stocking is offline   Reply With Quote
Old 17-07-2011, 10:20   #214
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: And So it Begins . . . Knottybuoyz' New Project

Just get the ply wet and set it between two saw-horses at it's edges. Murphy will bend it for you.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 17-07-2011, 11:54   #215
Provocateur & Raconteur
 
knottybuoyz's Avatar

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Iroquois, Ontario
Boat: Bateau.com TW31 Modified
Posts: 3,583
Images: 87
Re: And So it Begins . . . Knottybuoyz' New Project

Quote:
Originally Posted by Blue Stocking View Post
Does that mold become part of the boats transom area construction?
No. It's not part of the boat.

Quote:
Originally Posted by Blue Stocking View Post
If not, how much extra curvature was designed in to allow for the straightening forces of the ply.
I don't know. I would assume the designer took some springback into account.

I might try Del's suggestion on some scrap pieces to see how it works. I've only got one shot at this part.

I am able to get both sheets to bend into shape with brute force.



It's tricky but it'll work. Having conversed with a few other builders this is the way they did it.

It's way too hot (40C, 105F) in the shed today so I'm gonna think on this one.
__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
knottybuoyz is offline   Reply With Quote
Old 17-07-2011, 11:55   #216
Provocateur & Raconteur
 
knottybuoyz's Avatar

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Iroquois, Ontario
Boat: Bateau.com TW31 Modified
Posts: 3,583
Images: 87
Re: And So it Begins . . . Knottybuoyz' New Project

Quote:
Originally Posted by DeepFrz View Post
Good luck in selling your boat.
Never showed.

Boat's nice and clean now though!
__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
knottybuoyz is offline   Reply With Quote
Old 17-07-2011, 21:00   #217
Moderator Emeritus
 
hummingway's Avatar

Cruisers Forum Supporter

Join Date: Jan 2010
Location: Gabriola Island & Victoria, British Columbia
Boat: Cooper 416 Honeysuckle
Posts: 6,933
Images: 5
Re: And So it Begins . . . Knottybuoyz' New Project

Easing the back with kerfs does allow ply to bend much easier but unless you put a lot of kerfs it isn't a very fair curve; you get a bend where each kerf is (in my experience). Starting with thinner plys and laminating them works wonderfully in a messy whole lot of glue and clamps sort of way! You will have decking and hull to help the ply hold it's curve so, by way of speaking famous last words, I thnk you'll be alright.
__________________
“We are the universe contemplating itself” - Carl Sagan

hummingway is offline   Reply With Quote
Old 18-07-2011, 08:20   #218
Registered User
 
Capt Phil's Avatar

Join Date: Jun 2010
Location: Stateline NV
Boat: Prior boats: Transpac 49; DeFever 54
Posts: 2,749
Re: And So it Begins . . . Knottybuoyz' New Project

Thanks for the continuing saga of your build, Knottybuoyz... every time my enthusiasm lags in the rebuild of my old 1955 Chris Craft Continental, your efforts give me new encouragement to keep at it... cheers, Capt Phil
__________________
Capt Phil is offline   Reply With Quote
Old 18-07-2011, 16:09   #219
Provocateur & Raconteur
 
knottybuoyz's Avatar

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Iroquois, Ontario
Boat: Bateau.com TW31 Modified
Posts: 3,583
Images: 87
Re: And So it Begins . . . Knottybuoyz' New Project

Thnx Capt Phil, appreciate you looking in. I have a great admiration for anyone considering the resto of a classic wooden boat. Really.

Anyhow, I popped the clamps and straps off.



It sprung back about 3/4" on each side. Dunno if that's good or bad.



Just seems like a whole lot of screwin' around for one part. Onto the next challenge, stitching the cabin roof together.
__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
knottybuoyz is offline   Reply With Quote
Old 18-07-2011, 16:19   #220
Senior Cruiser
 
Blue Stocking's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,114
Re: And So it Begins . . . Knottybuoyz' New Project

Theres your 6%. In all fairness, the number of veneers and the wood in the ply can make a considerable difference on the "return", . Nothing that some extra re-inforcing won't heal.
Looks great all the way
__________________
so many projects--so little time !!
Blue Stocking is offline   Reply With Quote
Old 18-07-2011, 16:44   #221
Registered User

Join Date: Dec 2009
Location: Ontario
Boat: 5 m Bolger runabout, plus a Starwind 860 power tri under construction
Posts: 248
Re: And So it Begins . . . Knottybuoyz' New Project

Not bad, Rick. Not bad at all

I've tried kerfing plywood a few times for models. I don't bother anymore- it'll bend tight but it just won't bend fair, and it completely destroys the structural value of the outer (i.e. most critical) layer of the plywood. More, thinner plys and more brute force seems to be the way to go.

Enjoying the reports so far... keep 'em coming
__________________
Matt Marsh
marshmat is offline   Reply With Quote
Old 18-07-2011, 17:38   #222
Provocateur & Raconteur
 
knottybuoyz's Avatar

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Iroquois, Ontario
Boat: Bateau.com TW31 Modified
Posts: 3,583
Images: 87
Re: And So it Begins . . . Knottybuoyz' New Project

Thnx fella's. It was a bit of a strain on my poor ole' tired noodle but I figured it out with a lil' help from my friends and the Internet.

Lori, my neighbor Robert and I moved the cabin roof panels in on the long table.



Better picture I think.



It's 16' 4" long by 8' wide. Sorta brings a whole new perspective to the size of this beast we're bringing to life and the boat is another 2 feet wider than the roof top! I know a 31' boat doesn't sound like much but when you're building it in your 36' long back yard in a shed that's only 32' long everthing seems supersized for some reason! I'm sorry, I had 'nuther "WTF have I gotten us into now" moments tonight!
__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
knottybuoyz is offline   Reply With Quote
Old 18-07-2011, 17:52   #223
Moderator Emeritus
 
hummingway's Avatar

Cruisers Forum Supporter

Join Date: Jan 2010
Location: Gabriola Island & Victoria, British Columbia
Boat: Cooper 416 Honeysuckle
Posts: 6,933
Images: 5
Re: And So it Begins . . . Knottybuoyz' New Project

Boats do look big when you get them out of the water. Someday you'll be drinking a Guiness from the deck of the thing and won't even be able to remember wondering if it was a bad idea.
__________________
“We are the universe contemplating itself” - Carl Sagan

hummingway is offline   Reply With Quote
Old 19-07-2011, 06:08   #224
Senior Cruiser
 
Blue Stocking's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,114
Re: And So it Begins . . . Knottybuoyz' New Project

Quote:
Originally Posted by hummingway View Post
Boats do look big when you get them out of the water. Someday you'll be drinking a Guiness from the deck of the thing and won't even be able to remember wondering if it was a bad idea.
Amen to that, brother
__________________
so many projects--so little time !!
Blue Stocking is offline   Reply With Quote
Old 19-07-2011, 06:52   #225
Provocateur & Raconteur
 
knottybuoyz's Avatar

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Iroquois, Ontario
Boat: Bateau.com TW31 Modified
Posts: 3,583
Images: 87
Re: And So it Begins . . . Knottybuoyz' New Project

Reminds me of this picture.



This fella built his TW28 about 6 years ago with his boys. I can only dream of the satisfaction he must have been feeling at that time. I hope he's still getting as much enjoyment out of the boat now as he was then.
__________________

__________________
Yours Aye! Rick
~^~^~^^~^~^~^~^~^~^~^~~^~^~~^~^~^^~~^~^
"It's not the boat "you built" until you've sworn at it, bled on it, sweated over it, cried beside it and then threatened to haul the POS outside and burn it!"
knottybuoyz is offline   Reply With Quote
Reply

Tags
boat building, bow shed, construction, fairing, Flexicat, home built, paracelle, stitch & glue, trawler

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:46.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.