Cruisers Forum
 


View Poll Results: Are in-mast furling mainsails the bomb?
Duh. 3 4.11%
I'm a sailor. I've heard of "bomb ketch" but don't understand your question. 1 1.37%
You do know that polls should have questions that can be answered, right? 3 4.11%
In-mast furling mainsails are really convenient. I stand by them. 46 63.01%
Honestly, between you and me, I hate 'em 20 27.40%
Voters: 73. You may not vote on this poll

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 23-08-2021, 19:42   #196
Registered User

Join Date: Jul 2010
Boat: Sundeer 64' ketch
Posts: 99
Re: So walk me through the in-mast furling mainsail

I am biased. I like loose footed full batten mains. Battens reduce the slapping and maintain shape. Quick and easy to reef, essential for ocean sailing and heavy seas. You Must have a good manual furling system in the event of power winch failure. A heavy roach with full battens increases speed and power amd you can point higher without sail flogging. I agree on a bigger boat ball bearing vattcars are necessary.
Nibiruwayne is offline   Reply With Quote
Old 24-08-2021, 02:47   #197
Registered User

Join Date: Aug 2007
Location: Adelaide, South Australia, sailing in the Med.
Boat: Beneteau, Oceanis 50 G5
Posts: 1,224
Re: So walk me through the in-mast furling mainsail

Quote:
Originally Posted by donradcliffe View Post
I have used all kinds of mainsail systems--in mast, in boom, dutchman, stack pack. Just finished a 2400 mile delivery from Kauai to Santa Cruz, mostly to weather on a 42 ft boat with in mast furling. We had a lot of problems unfurling in lighter winds, with folds in the sail jamming in the slot. Things got better in bigger breeze, as the shaking sail sorted itself out better than we could.

There was a huge performance hit on the wind. Compared to other systems, the main had less area, less shape, and the maximum draft was back at the leach. Fortunately the boat had a pretty good looking genoa, otherwise I'd still be out there.

If it was my boat it would have a dutchman system, no bow thruster, and some sea berths, but hey, its a "modern" boat.
That must have been one old and worn system for all those issues. We do 9.8 in 14knts true close-hauled, and I'm happy with that. The sail comes in and out of the mast with ease, but it is a Selden system, and they seem to be the benchmark for typical cruisers size boats.
__________________
Thankful for the wonders of this world - and the waters that cover much of it.
David B is offline   Reply With Quote
Old 21-10-2021, 09:00   #198
Registered User

Join Date: Feb 2019
Posts: 69
Re: So walk me through the in-mast furling mainsail

This may be the best read on this topic I have found. Thanks to all.

We are About to finish specifying our new boat and this is one of the last big details to nail down. First I love the sail shape and reliability of a slab full batten system for all the reasons previously mentioned but we are leaning towards IMF for all the reasons previously mentioned. What I will try to add and has only been mentioned in short is that not ALL IMF sails are flat and with hollow leaches - there are some great looking IMF sails with roach and reasonable depth. We have sailed a similar example and performance/shape was Arguably better than the 3dis on our last boat.
Attached Thumbnails
Click image for larger version

Name:	84264776-2FD3-4155-B58C-5C6ABAEF46D2.jpeg
Views:	36
Size:	224.5 KB
ID:	247143  
SV-Viento is offline   Reply With Quote
Old 21-10-2021, 09:12   #199
Registered User

Join Date: Feb 2019
Posts: 69
Re: So walk me through the in-mast furling mainsail

A couple more shots of IMF sails. We sailed these and found their shape (depth and roach) really nice not just acceptable.
Attached Thumbnails
Click image for larger version

Name:	85AD5BAB-BB32-464A-A929-79490DA8DCBC.jpeg
Views:	33
Size:	70.7 KB
ID:	247144   Click image for larger version

Name:	86BF4EA3-8F16-47ED-8BEA-BE8A2BD584BA.jpeg
Views:	34
Size:	141.2 KB
ID:	247145  

SV-Viento is offline   Reply With Quote
Old 23-10-2021, 19:42   #200
Registered User

Join Date: Aug 2007
Location: Adelaide, South Australia, sailing in the Med.
Boat: Beneteau, Oceanis 50 G5
Posts: 1,224
Re: So walk me through the in-mast furling mainsail

Quote:
Originally Posted by SV-Viento View Post
A couple more shots of IMF sails. We sailed these and found their shape (depth and roach) really nice not just acceptable.
This might give you some more information (Selden on a Beneteau Oceanis 50). The sail view is from around 16:30 (where this link should start from).
I regret now not getting under the boom with the camera, but for someone who would not have had IMF in a fit, I love it now - we do so much more sailing because it is so easy to get the sail in and out.
https://youtu.be/L3f6REPF2RE?t=989
__________________
Thankful for the wonders of this world - and the waters that cover much of it.
David B is offline   Reply With Quote
Old 23-10-2021, 23:30   #201
Registered User

Join Date: Jul 2020
Location: Malmo Sweden
Boat: Regina 43
Posts: 348
Re: So walk me through the in-mast furling mainsail

Quote:
Originally Posted by David B View Post
we do so much more sailing because it is so easy to get the sail in and out.
https://youtu.be/L3f6REPF2RE?t=989
One of the best arguments for roller furling in general and powered roller furling in particular.
Na Mara is offline   Reply With Quote
Old 24-10-2021, 11:30   #202
Registered User

Join Date: Feb 2019
Posts: 69
Re: So walk me through the in-mast furling mainsail

Quote:
Originally Posted by Na Mara View Post
One of the best arguments for roller furling in general and powered roller furling in particular.
I think this is true particularly as the sail plan gets larger. I'm not sure at what size IMF really becomes a benefit but my guess is around 40' and age of crew may play into this decision as well
SV-Viento is offline   Reply With Quote
Reply

Tags
furling, mainsail, mast, sail

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Mainsail in boom furling vs. in mast furling PAlter Seamanship & Boat Handling 55 21-06-2019 08:25
Cost to mast with in mast furling mainsail to J105? sea2ocean Deck hardware: Rigging, Sails & Hoisting 24 31-08-2018 11:09
Dufour In Mast Furling Mainsail-Conversion To Batten Mainsail stefano_ita Monohull Sailboats 4 04-03-2016 14:45
Walk through transom or stand up shower gcaskew Monohull Sailboats 5 07-02-2014 14:23
For Sale: Antigua 44' Walk-Through Ketch hobs Classifieds Archive 2 10-09-2011 05:42

Advertise Here


All times are GMT -7. The time now is 18:49.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.