?Supporting boat to work on bottom?? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 04-12-2007
Junior Member
 
Join Date: Mar 2007
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
rbaroni is on a distinguished road
?Supporting boat to work on bottom??

I just bought an Ericson 23 which is on a trailer. The bottom needs some work, but what are some methods of supporting the boat while working on the bottom. It would be very difficult to work with it on the trailer, espescially to paint, etc. I have a shop with horrizontal rafters that I could possibly attach to, or if I need to construct something, I can do that too. Thanks in advance for any suggestions.
Reply With Quote Share with Facebook
  #2  
Old 04-12-2007
TrueBlue's Avatar
Señor Member
 
Join Date: Oct 2004
Location: Narragansett Bay
Posts: 4,853
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 13
TrueBlue is a jewel in the rough TrueBlue is a jewel in the rough TrueBlue is a jewel in the rough
If you have the height to raise the keel off the slab and are considering hanging the boat from existing overhead structure, like garage ceiling joists, chances are the members will be insufficient for the loads.

Consider hiring a structural engineer to size two beams at points strategic to sling locations on the hull. Otherwise, purchase a set of boat stands which can be repositioned as required when doing bottom work. - Brownell Boat Stands

Problem with stands though is the convolutions required to remove the trailer.
__________________
True Blue . . .
sold the Nauticat
Reply With Quote Share with Facebook
  #3  
Old 04-12-2007
Junior Member
 
Join Date: Mar 2007
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
rbaroni is on a distinguished road
Thanks for the suggestions. The ceiling supports in my shed are not ceiling joists, but reasonably large member trusses spaced at approximately 9 feet apart. These were engineered for 70 pound snow load per s.f. of roof, so I think they would support the boat. The stands you mentioned looked good also, I wasn't able to figure out what exactly I would need. Thanks again.
Reply With Quote Share with Facebook
  #4  
Old 04-12-2007
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
If you can use the trusses, then I would recommend you do that... but do get a couple of boat stands, as you'll probably find them useful for when you have to reposition the straps coming down from the trusses.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #5  
Old 04-12-2007
TrueBlue's Avatar
Señor Member
 
Join Date: Oct 2004
Location: Narragansett Bay
Posts: 4,853
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 13
TrueBlue is a jewel in the rough TrueBlue is a jewel in the rough TrueBlue is a jewel in the rough
Roof trusses are engineered to carry loads over the top chords. The diagonal web members are in compression and bottom chords are actually in tension - resisting lateral forces.

Your trusses could very well work and I could do a quick calc to qualify the loads for you - but not knowing the Ericson 23 weight, existing live and dead loads on the structure and assuming the truss design, is risky business at best.

Perhaps others will chime in with creative alternatives to support the boat from below.
__________________
True Blue . . .
sold the Nauticat
Reply With Quote Share with Facebook
  #6  
Old 04-12-2007
kennya's Avatar
Senior Member
 
Join Date: Jul 2006
Location: Ok.
Posts: 117
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
kennya is on a distinguished road
If your trailer is one with adjustable pads, as I would suspect, for an Ericson 23, I believe they have a fixed keel and centerboard arrangement. You can fashion a brace and relieve one pad at a time to make your repairs. If your trailer has the full runners , purchase a couple of boat stands and do one side at a time.
Reply With Quote Share with Facebook
  #7  
Old 04-12-2007
christyleigh's Avatar
Senior Member
 
Join Date: Dec 2001
Location: North Brookfield, Mass.
Posts: 935
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
christyleigh is on a distinguished road
I did a smaller scale but similar project on my Siren 17 at only around 800 lbs way back when. I made my own plywood boxed boat stands/cradles, used a come-along from a rafter to lift the stern, pulled the trailor out some, slid in the rear stand/cradle, let the boat rest now on the trailor AND cradle, and then did a similar thing up front. Not very elegant, a bit tricky, but not supporting the whole boat weight at any one time from the ceiling rafter of my garage may be the key in my example.
__________________
Stan
'Christy Leigh'
NC 331
Wickford/Narragansett Bay RI
Reply With Quote Share with Facebook
  #8  
Old 04-12-2007
Junior Member
 
Join Date: Mar 2007
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
rbaroni is on a distinguished road
Thanks for the suggestions. I am comfortable with using the trusses for support, since I can add temporary posts at approximtely 10 foot to make that the span. Let's move on. Are two straps enough to support the boat, not concerned about the straps, but the boat? Regarding the boat stands, how do you figure out how tall to purchase? Thanks again.
Reply With Quote Share with Facebook
  #9  
Old 04-12-2007
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 11 Times in 11 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Most boat stands are somewhat height adjustable. Figure out how high you'll be hanging the boat from the trusses, and then base the height on that.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #10  
Old 04-12-2007
Owner, Green Bay Packers
 
Join Date: Sep 2006
Location: SW Michigan
Posts: 10,318
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice sailaway21 is just really nice
I had the same issue with my boat. I got four stands, two that are more often seen supporting power boats. I was able to position those two stands under the hull aft, where the hull form is fairly flat. I then screwed the pads up to raise the stern a bit. Then I took a ten foot 3x5 timber and placed it thwartships under the bow. Inside the forward end of the trailer I used an over-sized bottle jack with a 'V' block cut out of wood. I got the bottle jack, 20 ton, for $30 at the local discount tool store. I bought it oversize just for stability purposes. I used the bottle jack to raise the bow. After I'd raised it about a foot, I placed concrete blocks on either side of the trailer, with the 3x5 resting on them. I then lowered the boat down on to the 3x5 and blocked up my jack for the next lift up. I think I ended up with the cement blocks four high on each side. I adjusted the rear jacks as I raised the boat. Once I got the bow up to the fourth block height, that was sufficient for my trailer's fenders to clear the 3x5, and I pulled the trailer out. I continued jacking until I got to the height where I could get my forward boat stands under the bows. I then raised it further with all four boat stands.
The 3x5 was handy because sometimes I needed the 3" height, and sometimes the 5" height, while jacking up the bow.

I was seconds away from getting the final paint stripped from the hull, and the new bottom paint on, when winter returned with a vengence. With my luck, someone will make an offer on my 'for-sale' house and I'll have to lower it back on to the trailer, transport it, and repeat the procedure before i get it painted.(g)

I hope you have an older barn. I could envision some fun if you have pre-fab joists.
__________________
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Windward performance deseely General Discussion (sailing related) 21 04-01-2012 02:42 PM
Trailering? Pick a Boat Bruce Caldwell Cruising Articles 0 07-22-2004 08:00 PM
Naming and Renaming Your Boat Sue & Larry Buying a Boat Articles 0 12-15-2003 07:00 PM
The New Racing Rules Dobbs Davis Racing Articles 0 04-04-2001 08:00 PM
The Balance of Hull and Sails Steve Colgate Learning to Sail Articles 0 05-25-2000 08:00 PM


All times are GMT -4. The time now is 07:57 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.