Hobie Cat Forums

It is currently Sat Apr 19, 2014 9:07 am

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 23 posts ]  Go to page Previous  1, 2
Author Message
PostPosted: Tue Aug 28, 2012 4:25 pm 
Offline
Site Rank - Old Salt

Joined: Tue May 18, 2010 2:31 pm
Posts: 2568
Location: Kailua 96734
:lol: :lol: :lol: That seems prudent! We'll wait,..


Top
 Profile  
 
PostPosted: Fri Aug 09, 2013 2:24 am 
Offline
Site Rank - Old Salt

Joined: Fri May 08, 2009 5:06 am
Posts: 1502
Location: Lake Macquarie NSW AUSTRALIA
chrisj wrote:
I am planning to sail the boat from the quarterdeck with no amas, but I was waiting for summer - for the water to warm up a bit :roll: :roll: :roll:


OK, Chris, a summer has now come and gone. What happened ?

( don't know I missed this thread ).

_________________
Image

Don't take life too seriously................it ain't permanent.


Top
 Profile  
 
PostPosted: Fri Aug 09, 2013 5:37 am 
Offline
Site Rank - Old Salt

Joined: Sun Apr 20, 2008 6:18 am
Posts: 1038
Location: sarasota,fl
Chrisj:
Interesting stuff, I have a TI and have always contended that the AMA's should have been designed so they sit 1 foot further out so the boat would be 12 ft wide vs the current ten ft wide. Lengthening the AKA's would also raise them a little. I wonder if the AI would also benefit from a wider stance.
Bob


Top
 Profile  
 
PostPosted: Fri Aug 09, 2013 6:26 am 
Offline
Site Rank - Old Salt

Joined: Fri Dec 05, 2008 2:32 am
Posts: 1764
Location: Calga NSW, Australia
Slaughter wrote:
chrisj wrote:
I am planning to sail the boat from the quarterdeck with no amas, but I was waiting for summer - for the water to warm up a bit :roll: :roll: :roll:


OK, Chris, a summer has now come and gone. What happened ?

( don't know I missed this thread ).

Russ, life turned seriously pear-shaped soon after I posted that and I only got to go sailing two or three times all summer, so I have yet to try it. I'm hoping to get more opportunities to get out in the boat in the next few months.

fusioneng wrote:
Chrisj:
Interesting stuff, I have a TI and have always contended that the AMA's should have been designed so they sit 1 foot further out so the boat would be 12 ft wide vs the current ten ft wide. Lengthening the AKA's would also raise them a little. I wonder if the AI would also benefit from a wider stance.
Bob

Bob, what benefit do you envisage in a wider boat?

_________________
Image


Top
 Profile  
 
PostPosted: Fri Aug 09, 2013 6:46 am 
Offline
Site Rank - Old Salt

Joined: Sat Nov 05, 2011 1:58 am
Posts: 1246
Location: Forster, NSW, Australia
I can try and answer that Chris.. The wider stance offers greater resistance to heeling, without any increase in drag from the water. Added bonus is greater tramp area. Interestingly, that giant french trimaran I posted in the America's Cup thread had a width equal to its length, so theoretically and AI could have a 50% wider beam! But I think that the design would need just a few changes if the amas were each almost a metre further out from the main hull!


Top
 Profile  
 
PostPosted: Fri Aug 09, 2013 7:52 am 
Offline
Site Rank - Old Salt

Joined: Sun Apr 20, 2008 6:18 am
Posts: 1038
Location: sarasota,fl
Chrisj:
I couldn't have described it any better Tony. At least on my TI if I am on a reach in 12 plus mph winds, the AMA submerges under water, so I have to reef the sail 1 turn. If the boat were wider this wouldn't happen.
When I got my first TI I started with a 35 sq ft jib, it turned out to be too much sail so I had to cut it back. If you look at the specs on most of the other tri's out there like the Windrider 17 (which is 12 ft wide), they are all much wider, in my opinion there would be no downside to the change, actually being 2 ft wider would be nice because you could have Haka's and the tramps installed together.
Bob


Top
 Profile  
 
PostPosted: Fri Aug 09, 2013 2:05 pm 
Offline
Site Rank - Old Salt

Joined: Fri Dec 05, 2008 2:32 am
Posts: 1764
Location: Calga NSW, Australia
OK, so if you increased the effective width of the boat by 1/6th, you would increase the upward leverage which each ama exerts by 1/6th and reduce the submerged volume of the ama by about 1/6th. I can see that being of benefit in the newer AI, with the larger rudder, because it does not suffer from weather helm in higher winds. In the case of the older AI, which had considerable weather helm, I think the benefit would be less, because the drag of the leeward ama mitigated the weather helm to some extent, so lessening that drag would require either compensation with the rudder or reefing the sail further. I've never sailed a TI. Do they have much of a tendency to weather helm?

_________________
Image


Top
 Profile  
 
PostPosted: Fri Aug 09, 2013 4:18 pm 
Offline
Site Rank - Old Salt

Joined: Fri May 08, 2009 5:06 am
Posts: 1502
Location: Lake Macquarie NSW AUSTRALIA
Fully understand about the trialling Chris.

With a wider stance, is there a tradeoff ? In some way, with every design mod, there is always a tradeoff but the only downside I can see is the weight gain from the Akas being a bit longer and the aesthetics. It would look ugly.

_________________
Image

Don't take life too seriously................it ain't permanent.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 23 posts ]  Go to page Previous  1, 2

All times are UTC - 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group