Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-08-2014, 13:27   #1
Registered User
 
svtatoosh's Avatar

Join Date: Aug 2011
Location: Astoria
Boat: Alajuela 38
Posts: 104
Thru-bolting dinghy chocks?

Any horror stories about heavy weather ripping a hole in the cabin top due to the dinghy being TOO securely thru-bolted? I'm mounting a Fatty Knees to a 1"+ Alajuela 30 cabin top. Minimal thru-bolts for the chocks or go with robust backing plates and heavy thru-bolts? Safer too allow for dinghy breakaway if huge volume of water hits?

Tom
Astoria
__________________

__________________
svtatoosh is offline   Reply With Quote
Old 06-08-2014, 13:44   #2
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,371
Re: Thru-bolting dinghy chocks?

Probably so, although I know of no actual experiences of dingys ripping the deck up.... anyone? These things seem to start as part of someone's logic for construction in writing a "cruising the world" book... and pretty soon they are taken as fact...! :>)
__________________

__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 06-08-2014, 13:46   #3
Guy
Registered User

Join Date: Feb 2013
Location: So. Oregon, USA
Boat: Seafarer36c
Posts: 4,308
Re: Thru-bolting dinghy chocks?

I had some dinghy chocks bolted and glued with 5200 and when I went to remove them the bolts came out ok but the 5200 actually pulled off the gel coat. If you go with bolts and 5200, you could use pretty small bolts.
__________________
Guy is offline   Reply With Quote
Old 06-08-2014, 15:32   #4
Moderator
 
JPA Cate's Avatar

Join Date: Nov 2011
Location: aboard, cruising in Australia
Boat: Sayer 46' Solent rig sloop
Posts: 10,718
Re: Thru-bolting dinghy chocks?

Here's another way to approach the issue.

Create an "L" shaped "portable chock locater" from small stock, and bond it to the dedk, then make portable chocks to set in them for the dinghy. Add a couple of through-bolted pad eyes for mid-beam lashing, and one more to tie down the bow. The idea is to make the deck still be foot friendly when the dinghy is in the water. Our dinghy is a RIB, and the 3 point tie works for it. However, you might like to carry your dinghy upright rather than upside down, and for that, people make cradles for them, rather than chocks.
__________________
Ann, with Jim, aboard US s/v Insatiable II, in Oz, very long term cruisers
JPA Cate is offline   Reply With Quote
Old 06-08-2014, 16:04   #5
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,071
Re: Thru-bolting dinghy chocks?

http://www.issuma.com/rhudson/orbitlog/rolltech.htm

Richard talks about the dingy damaging the cabintop here. Sounds like the chocks where not fully at fault.
__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 06-08-2014, 16:30   #6
Registered User
 
svtatoosh's Avatar

Join Date: Aug 2011
Location: Astoria
Boat: Alajuela 38
Posts: 104
Re: Thru-bolting dinghy chocks?

Softwood chocks were used to provide breakaway strength.
__________________
svtatoosh is offline   Reply With Quote
Old 06-08-2014, 17:00   #7
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,071
Re: Thru-bolting dinghy chocks?

On the whole I would go for solid, with heavy backing plates. And a series drogue to keep impacts more from astern. You dont want the thing shifting in an average gale or minor wavestrike. Nylon lashings may help? Consider the upwards pull from the lashings and downward loads on the cabintop. Get the dink as low as possible, even cutting out the transom so it fits over the garage and companionway makes a huge difference. Any photos, sounds like a lovely boat. Cheers
__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 06-08-2014, 17:07   #8
Registered User
 
svtatoosh's Avatar

Join Date: Aug 2011
Location: Astoria
Boat: Alajuela 38
Posts: 104
Re: Thru-bolting dinghy chocks?

Thanks. Yes I had considered nylon for a bit of give. Makes sense.
__________________
svtatoosh is offline   Reply With Quote
Old 06-08-2014, 17:49   #9
Writing Full-Time Since 2014
 
thinwater's Avatar

Join Date: Nov 2008
Location: Deale, MD
Boat: PDQ Altair, 32/34
Posts: 4,350
Re: Thru-bolting dinghy chocks?

Seems far safer and more logical to design completely secure chocks and then calibrate the strength of the lashing. Much easier to design, much easier to replace the lashing as need to maintain the desired breaking point.

I would NOT do nylon; it will tighten and loosen as it wets and dries, and stretching under impact may make it come off the chocks. Truckers HATE stretchy lashings. Polyester or Amsteel, with a short, breakable cord lashing. Something like that.
__________________

__________________
Gear Testing--Engineering--Sailing

Writing full-time since 2014.
Bookstore:http://sail-delmarva.blogspot.com/20...ook-store.html
thinwater is offline   Reply With Quote
Reply

Tags
dinghy

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale: Weaver Removable Dinghy Chocks twistedtree Classifieds Archive 1 21-12-2013 16:18
For Sale: Dinghy Chocks for RIB Tony B Classifieds Archive 2 21-05-2013 05:28
For Sale: Dinghy Chocks for RIB Tony B Classifieds Archive 0 12-04-2013 13:07
Exhaust: Thru Hull? Not Thru Hull? steel Powered Boats 12 18-10-2012 22:14
Marinium Cleats and Chocks? Zach Anchoring & Mooring 4 10-04-2008 15:30



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:13.


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.