Weird Roundup under bridge... - Page 2 - SailNet Community
 4Likes
Reply
 
LinkBack Thread Tools
post #11 of 21 Old 04-13-2017
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 19,041
Thanks: 82
Thanked 534 Times in 511 Posts
Rep Power: 11
   
Re: Weird Roundup under bridge...

Pretty sure we're talking about a bridge without a tender and an airdraft of maybe 100ft, with abutments rather far part too. Yes?


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

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Minnewaska is offline  
Sponsored Links
Advertisement
 
post #12 of 21 Old 04-13-2017
Senior Member
 
krisscross's Avatar
 
Join Date: Feb 2013
Location: Florida
Posts: 4,028
Thanks: 40
Thanked 218 Times in 217 Posts
Rep Power: 7
 
Re: Weird Roundup under bridge...

Quote:
Originally Posted by Minnewaska View Post
Pretty sure we're talking about a bridge without a tender and an airdraft of maybe 100ft, with abutments rather far part too. Yes?
Yes, that is a pretty much standard fixed bridge over ICW

Be kind, for everyone you meet is fighting a hard battle.
Plato
krisscross is online now  
post #13 of 21 Old 04-13-2017 Thread Starter
Senior Member
 
Join Date: May 2014
Location: Cocoa, Florida
Posts: 226
Thanks: 0
Thanked 15 Times in 15 Posts
Rep Power: 6
 
Re: Weird Roundup under bridge...

Yes, regular ICW bridge, about 64ft of clearance. Pretty wide. Used to get engine running but now feeling a little more confident. Motor wouldn't have helped this. This was a roundup, pure and simple. My fiddle block on the main sheet has a cam cleat that faces down. So, a little snap of the sheet down lets it go, a little pull and lift up and it locks. It's the only one I ever worked with, so I don't know what else is out there. Sure glad I didn't hit that fender, it would have been bad. I don't need any problems like that. Boats get dismasted like that, right? kev
FloridaBoy is online now  
 
post #14 of 21 Old 04-13-2017
Senior Member
 
fallard's Avatar
 
Join Date: Nov 2009
Location: Mystic
Posts: 2,226
Thanks: 8
Thanked 78 Times in 77 Posts
Rep Power: 10
 
Re: Weird Roundup under bridge...

It looks like there is a 600' opening by the old bridge approaches and it would appear the currents are minimal--probably peaking at much less than 2 kts. The fixed Rt 520 bridge vertical clearance is 65' and its horizontal clearance (channel center) is 90', with a total span of about 1600' (shore to shore). You would have to watch for traffic in the opening, but the waterway appears to be very wide on either side of the opening.
fallard is online now  
post #15 of 21 Old 04-13-2017 Thread Starter
Senior Member
 
Join Date: May 2014
Location: Cocoa, Florida
Posts: 226
Thanks: 0
Thanked 15 Times in 15 Posts
Rep Power: 6
 
Re: Weird Roundup under bridge...

No currents. It's a bog, or more precisely, a lagoon. It is a rare thing to have a current. It's 30 miles north and south to any inlets. Sebastion to the south and Ponce inlet to the north. Fifteen years ago, you could see the bottom from the boat in 12 feet of water. See the grass waving. Now, it's a mud hole. Brown algae. Runoff. I dive on my boat to clean bottom, good viz is 2-3 feet, maybe. Nothing but mud on the bottom. No sunlight gets through. Poor lagoon, killed by man. Spent the last 30 years on the Indian River, hope it comes back someday. kev
FloridaBoy is online now  
post #16 of 21 Old 04-13-2017
Senior Member
 
RichH's Avatar
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 5,021
Thanks: 54
Thanked 326 Times in 310 Posts
Rep Power: 20
   
Re: Weird Roundup under bridge...

Quote:
Originally Posted by FloridaBoy View Post
Must have been a vortex or something there under the bridge. Great learning experience and I'll be a lot more alert next time I go under a damned bridge. Kevin

TWO 'possibles' here
Could have been a wind vortex cause by the shape of the bridge structure; OR, could have been a combo of an aerodynamic 'rotor' - PLUS, an increase in water velocity in close proximity to and as deflected by the bridge structure during tide flow (or simply being too close to structure when the boat is 'at speed').

In the case of a water velocity increase (from tide rip, etc.) due to water 'deflection' by the structure ... the zone of higher speed water will tend to 'suck' you into the structure. If interested in the technicals, do web search for "vena contracta".
This is the very same reason that LARGE ships do not / will not pass close to one another when at speed ... as the increased water velocity of the between the two (plus a generated 'trough' of water between the two ships) will tend to cause each to get 'sucked into' one another ... all due to anomalies of 'hydraulics'.

Its good you survived unscratched, which is the best part of any 'surprise' education.
RichH is offline  
post #17 of 21 Old 04-13-2017
Old as Dirt!
 
svHyLyte's Avatar
 
Join Date: Nov 2008
Location: Tampa Bay Area
Posts: 3,444
Thanks: 25
Thanked 184 Times in 174 Posts
Rep Power: 11
 
Re: Weird Roundup under bridge...

Quote:
Originally Posted by RichH View Post
...

In the case of a water velocity increase (from tide rip, etc.) due to water 'deflection' by the structure ... the zone of higher speed water will tend to 'suck' you into the structure. If interested in the technicals, do web search for "vena contracta".

This is the very same reason that LARGE ships do not / will not pass close to one another when at speed ... as the increased water velocity of the between the two (plus a generated 'trough' of water between the two ships) will tend to cause each to get 'sucked into' one another ... all due to anomalies of 'hydraulics'.

...
Bernoulli lurks at the base of every bridge...
RichH and chef2sail like this.

"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
svHyLyte is offline  
post #18 of 21 Old 04-13-2017
Seņor Member
 
ottos's Avatar
 
Join Date: Aug 2008
Location: OC NJ
Posts: 555
Thanks: 2
Thanked 11 Times in 11 Posts
Rep Power: 11
 
Re: Weird Roundup under bridge...

FB - Did you have any jib out?
ottos is offline  
post #19 of 21 Old 04-13-2017 Thread Starter
Senior Member
 
Join Date: May 2014
Location: Cocoa, Florida
Posts: 226
Thanks: 0
Thanked 15 Times in 15 Posts
Rep Power: 6
 
Re: Weird Roundup under bridge...

130% jib out. You know, I know what you guys mean, going fast, too close to the fender. I have never gone under that bridge going that fast, under sail. Usually 2 or 3 knots, real slow, mostly with the engine on and in gear, cause of the slow speed. That might have been a factor, along with a puff. kev
FloridaBoy is online now  
post #20 of 21 Old 04-14-2017
cdy
Senior Member
 
Join Date: Nov 2013
Posts: 404
Thanks: 0
Thanked 22 Times in 22 Posts
Rep Power: 6
 
Re: Weird Roundup under bridge...

Its a fixed bridge - no bridge tender, not much current, tide in Cocoa - most likely just a wind incident( not current related) my boat is moored just on the southwest side of the 520 bridge,
cdy is offline  
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Weird weird july weather..... oysterman23 General Discussion (sailing related) 21 07-09-2014 06:43 PM
Local Roundup: Conn sailing wins Intersectional NewsReader News Feeds 0 09-19-2011 03:10 AM
Monday Midday News Roundup - Cbs 5 NewsReader News Feeds 0 01-29-2007 04:15 PM
Local roundup (The Providence Journal) NewsReader News Feeds 0 11-21-2006 01:15 AM
AAA's Great Battery Roundup April 22nd NewsReader Mass Bay Sailors 0 04-20-2006 12:15 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome