Heavy winds? - Page 4 - SailNet Community
 8Likes
Reply
 
LinkBack Thread Tools
post #31 of 35 Old 12-19-2012
Senior Member
 
blt2ski's Avatar
 
Join Date: May 2005
Posts: 6,862
Thanks: 0
Thanked 26 Times in 25 Posts
Rep Power: 12
   
Re: Heavy winds?

Quote:
Originally Posted by Cruisingdad View Post
Please make sure to emphasize "... YOU ARE the "BEST LOOKING..." SOunds better that way. Also helps to keep my fellow male mods (the not good looking ones) in check!!

Brian
"WHO" claims you to be the BEST looking MALE mod?!?!?! not me!

Winston is he best looking MALE mod! Didn't know he was a mod did ya! Time to delete ol CD with that spikey collared ugly thingy of a dog! Yep. that is my story and I am sticken to it!

So with that, when do you come up here to the NW next?

Marty

She drives me boat,
I drives me dinghy!
blt2ski is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #32 of 35 Old 12-22-2012
Senior Member
 
Join Date: Nov 2005
Location: Milton, DE
Posts: 592
Thanks: 2
Thanked 7 Times in 7 Posts
Rep Power: 10
 
Re: Heavy winds?

Quote:
Originally Posted by lapworth View Post
I was out the other day with a cold North wind on the bay. There was only a few white caps so I believe the wind was around 12 knts at most. I like to get the boat moving between 3.5 to 2.5 knts. I am trolling. Almost all summer there in these conditions I would use small jib and main. Yesterday with this setup I was doing almost 5. So I reefer and that only slowed me down to 4-4.5. Finally decided to drop main. Now I was sailing at 3-3.5 knts. Are cold winds heavier then warm winds making your boat sail faster. Also i was sailing across channel so current would be a very small factor.
To answer your question, air density at 80 degrees is 0.070 lbs./cubic ft. while at 30 deg. it's 0.081lbs. But since the major driving force was the Bernoulli effect, I think that the cold air gives a different perception, imho.
Dick
dugsmith98 likes this.
Flybyknight is offline  
Quote Quick Reply Share with Facebook
post #33 of 35 Old 12-22-2012
sunfish?junior?
 
Join Date: Mar 2012
Location: Richmond ky
Posts: 748
Thanks: 47
Thanked 11 Times in 11 Posts
Rep Power: 4
 
Re: Heavy winds?

This is way out of my limit . Bernoulli did most of his work of I think in fluid dynamics. Fluid that you can not compress. Air can compress more than fluid. Some fluid can because it has gases inside. I fly, I sail I fit pipe with fluids and gases and changing of state from gases to fluid super heat and so on. This could be the point when we need to ask the PE to explain. I will just have to take his word he will pull out a lot of math with letters an such, I will stay with my first and the majority. Cold air has more lift and power. Any PE want to jump in this? Regards ,Lou
Lou452 is offline  
Quote Quick Reply Share with Facebook
post #34 of 35 Old 12-23-2012
Senior Member
 
sealover's Avatar
 
Join Date: Jun 2009
Posts: 357
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Re: Heavy winds?

My question about the anemometer - mine is three little cups on short plastic arms, all of which rotate about an axle. When the wind is making the whole mess rotate, it's more or less "filling" one of those cups at any time, but the other two are heading (backwards) back into the wind. Maybe nice weather stations take temperature into account when converting shaft rpm into wind speed?

Air feels a whole lot heavier when riding a motorcycle without a windshield. 23 degrees is the coldest I've ridden any real distance. Noticeably different lean-forward angle compared to 95 degrees. Not that I care at 23 degrees. I'm just cussing and hanging on for dear life.

Keep the expenses low and the good times high.

S/V Waitara
Venture 21
PA Freshwater / Chesapeake
sealover is offline  
Quote Quick Reply Share with Facebook
post #35 of 35 Old 12-23-2012
Just another Moderator
 
Faster's Avatar
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,534
Thanks: 104
Thanked 312 Times in 300 Posts
Rep Power: 10
     
Re: Heavy winds?

With an anemometer the cups are pushed, on the 'wrong way' side of rotation you're fighting the drag.. I think the density difference will even out/cancel in this case.

Bernoulli is an 'easy' way to explain lift but it's not the true science.

As an extreme illustration, think of standing on a dock with 5 knots of wind.. no problem... then go stand in a creek with 5 knots of current running... good luck staying on your feet. Same velocity a lot more force....

Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Faster is offline  
Quote Quick Reply Share with Facebook
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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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
Tacking in heavy winds Jetexas Learning to Sail 8 12-18-2012 03:17 PM
Heavy winds take a toll in New Bedford harbor - SouthCoastToday.com NewsReader News Feeds 0 11-09-2012 11:40 PM
Where I've Been (Pic Heavy) Cruisingdad General Discussion (sailing related) 16 11-06-2011 08:07 PM
Sailors faced heavy winds at Dauphin Island Race (Pensacola News Journal) NewsReader News Feeds 0 05-02-2006 02:16 AM
Good for heavy AND light winds? jbarros Boat Review and Purchase Forum 4 09-30-2003 11:03 AM

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