Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-11-2012, 08:36   #16
Senior Cruiser
 
Blue Stocking's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,117
Re: Mast height, how to tell?

See if you can find a copy of Bruce Bingham's book, Sailors Sketchbook. A wealth of info on this issue, and much more.
__________________

__________________
so many projects--so little time !!
Blue Stocking is offline   Reply With Quote
Old 02-11-2012, 09:02   #17
Certifiable Refitter/Senior Wannbe
 
Wotname's Avatar

Cruisers Forum Supporter

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: Van DeStat Super Dogger 31'
Posts: 7,331
Re: Mast height, how to tell?

Quote:
Originally Posted by messias View Post
THANKS Pete!

I´ll look into it right away, because when I was searching for "pivotting", I only had some kind of Race-setup...

And if it´s not too much to ask, is it possible to transform a non-tabernacle into a tabernacle keeping the same mast/sails, or it has to be a fully redesigned one? No races, no best-performances, no nothing... just fooling arround in the bay learning how to sail...


Thanks again!
Short answer is YES. There are some important details to consider but I have had it done and it wasn't hard.

FWIW, there are hundreds of boats on the Swan Rviver (West Oz) that have similar setups.
__________________

__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 02-11-2012, 09:15   #18
Registered User
 
messias's Avatar

Join Date: Jan 2011
Location: Salted & Fresh Water
Boat: Dehler Varianta 65
Posts: 166
Re: Mast height, how to tell?

Once again, Thank you all for the "enlightment"

Now back to finding the appropriate boat to "de-mast"
__________________
messias is offline   Reply With Quote
Old 02-11-2012, 09:36   #19
Registered User
 
Capt Phil's Avatar

Join Date: Jun 2010
Location: Stateline NV
Boat: Prior boats: Transpac 49; DeFever 54
Posts: 2,749
Re: Mast height, how to tell?

Our esteemed Moderator has the quick, easy and practical answer in Post #5. If the masurement has to be precise, ie., for race boat measurements, use Adelie's method. Phil
__________________
Capt Phil is offline   Reply With Quote
Old 02-11-2012, 13:36   #20
Registered User

Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 7,961
Re: Mast height, how to tell?

...Motor under some bridges, and when you hit one, you will know that you are taller than that clearance height. ...[/QUOTE]


Ah yes, the "empirical" method:
Attached Thumbnails
Click image for larger version

Name:	image5.jpg
Views:	81
Size:	59.9 KB
ID:	49152  
__________________
belizesailor is online now   Reply With Quote
Old 02-11-2012, 13:46   #21
Registered User
 
sww914's Avatar

Join Date: May 2009
Location: Punta De Mita
Boat: Vagabond 39 Hull # 1
Posts: 1,842
Re: Mast height, how to tell?

Quote:
Originally Posted by belizesailor View Post
...Motor under some bridges, and when you hit one, you will know that you are taller than that clearance height. ...

Ah yes, the "empirical" method:[/QUOTE]
Most folks probably won't let you do that on a sea trial. LMAO!
__________________
Steve
http://www.landfallvoyages.com
sww914 is offline   Reply With Quote
Old 02-11-2012, 14:54   #22
Registered User
 
Me-and-Boo's Avatar

Join Date: Jul 2011
Location: Annapolis, MD
Boat: Catalina 30
Posts: 298
Images: 19
Re: Mast height, how to tell?

I was the rocket scientist, or rather the computer engineer who made the computer the rocket scientist used. I found the math hard too.

The boat sizes mentioned are trailerable, so the mast can be dropped for that; even if it isn't you should be able to find a couple people around willing to help unstep your mast for a beer or two.

Quote:
Originally Posted by Adelie View Post
It's not rocket science, it's high school geometry and math plus a bit of experience. I know this because I tried to be a rocket scientist when I was in college and I couldn't hack the math.
__________________
It didn't sink all the way - you can still see the mast
Me-and-Boo is offline   Reply With Quote
Old 02-11-2012, 15:14   #23
Registered User
 
Matt sachs's Avatar

Join Date: Jul 2010
Location: East Tennessee
Boat: 1989 50 ft Roberts
Posts: 859
Images: 18
Re: Mast height, how to tell?

Once again the simple method is the best. I was going to have you measure from the base of the mast to the tip of the pulpit, measure the angle from the pulpit to the top of the mast use the cosign (or sin, or inverse tangent or something like that) to calculate how tall it is. Post #5 I think is better.
__________________
Matt sachs is offline   Reply With Quote
Old 02-11-2012, 18:56   #24
Registered User
 
messias's Avatar

Join Date: Jan 2011
Location: Salted & Fresh Water
Boat: Dehler Varianta 65
Posts: 166
Re: Mast height, how to tell?

Quote:
Originally Posted by Me-and-Boo View Post
even if it isn't you should be able to find a couple people around willing to help unstep your mast for a beer or two.
I really like your approach, because i´d be willing to help out a guy with a boat to de-mast ... but when I´ll be the guy WITH the boat and thinking in the number of bridges with a 5mt clearence in the Vltava river... That´s a whole lot of beer! (and they only start in 1/2lt here ).

By the way... they have a few pretty neat solutions in some parts here, take a look a the pic.
Attached Images
 
__________________
messias is offline   Reply With Quote
Old 03-11-2012, 00:05   #25
Certifiable Refitter/Senior Wannbe
 
Wotname's Avatar

Cruisers Forum Supporter

Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: Van DeStat Super Dogger 31'
Posts: 7,331
Re: Mast height, how to tell?

Convert mast to have a hinge point near tabernacle. Raise pivot point of cap shrouds to be in line with the mast hinge pin. This is important as doing this keeps the tension on the cap shrouds as mast is lowered.

Use two spinnaker poles to form an A frame with apex of A attaching via a camp or similar to forestay near stem head fitting. Rig multipart block and tackle between the apex and the stem head. Release forestay and forward lower shrouds and allow mast to pivot backwards and thus raising the A frame upwards. Of course the aft end of the spinnaker poles have to be clipped to the deck on suitable hard points. Normally some permeant or temporary stay is needed to hold the extended cap shroud chainplate in position so it doesn't move aft.

Hard to describe and maybe I can work out how to post a suitable drawing if it helps.

This method is used every weekend by dozens and dozens of boats locally in Perth for boats from 20' to 40+'.
__________________
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
Wotname is offline   Reply With Quote
Old 03-11-2012, 04:16   #26
Registered User
 
messias's Avatar

Join Date: Jan 2011
Location: Salted & Fresh Water
Boat: Dehler Varianta 65
Posts: 166
Re: Mast height, how to tell?

Thank you all for explaining this things to me.
__________________

__________________
messias is offline   Reply With Quote
Reply

Tags
mast

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 12:33.


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.