How wide is to wide ?
Printed From: Yachts and Yachting Online
Category: Multihulls
Forum Name: Dinghy multihulls
Forum Discription: For those who prefer two (or more) hulls to one!
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=1131
Printed Date: 18 Apr 24 at 10:04am
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: How wide is to wide ?
Posted By: Scooby_simon
Subject: How wide is to wide ?
Date Posted: 21 Oct 05 at 1:41pm
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How wide would you like your cat to be (if towing was not an issue) 1/2 the length is the old Rule-of-thumb. I am thinking wider might be better if you have a kite as it gives you some lift. What do you thing ?
------------- Wanna learn to Ski - PM me.. |
Replies:
Posted By: Tornado_ALIVE
Date Posted: 21 Oct 05 at 4:05pm
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Gives some lift but also ability to drive harder...... Safer to stick with 12 LOA rule ------------- 
http://www.formula18alive.com - www.formula18alive.com |
Posted By: Scooby_simon
Date Posted: 21 Oct 05 at 11:23pm
I assume you mean 1/2 LOA  But what about with the addition of T foil rudders ? Seriously thinking about making the new boat 10 feet wide...... ------------- Wanna learn to Ski - PM me.. |
Posted By: Chris Noble
Date Posted: 23 Oct 05 at 10:57am
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what did you mean by it gives some lift? ------------- http://www.noblemarine.co.uk/home.php3?affid=561 - Competitive Boat Insurance From Noble Marine FOR SALE: I14 2 Masts 2 poles 3 Booms, Foils Kites/Mains/Jibs too many to list. |
Posted By: Scooby_simon
Date Posted: 23 Oct 05 at 2:29pm
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When the kite is flying it gives some lift.
------------- Wanna learn to Ski - PM me.. |
Posted By: Tornado_ALIVE
Date Posted: 24 Oct 05 at 1:43pm
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Some but not much...... Kite is very flat compared to skiff kites. T foil rudders are slow when fixed and your trim is not right. On the I14s I sailed on the T foils were adjustable. I believe though, that foils to change the pitch of a boat causes excessive drag. Best to practice correct big breeze trapezing techniques and driving. If you are forced to use foils to maintain the pitch of a boat, the boat has some manufactured problems ie beam to wide or too much power for, fore aft righting momentem. -------------
http://www.formula18alive.com - www.formula18alive.com |
Posted By: Scooby_simon
Date Posted: 24 Oct 05 at 6:22pm
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Stephen,
I don't agree.
The one thing that slows cats down is having to ease off becasue you have run out of bow. Yes T's do add a little drag (or a lot if they are set wrong). But if they allow you to press harder (after you have "Best to practice correct big breeze trapezing techniques and driving") then you will be able to go faster down wind.
I've yet to sail a T-foiul boat, but judging from what people say they love them and they allow you to drive harder (and so faster) down wind. ------------- Wanna learn to Ski - PM me.. |
Posted By: Jalani
Date Posted: 24 Oct 05 at 9:27pm
What T foils DO allow you to do is drive off really hard in a gust without burying (or not burying much) and therefore being able to gain lots of distance to leeward at speed. The boat becomes very responsive without the rudders losing 'grip' and the foils hold the bows up when they would normally dive. 
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Posted By: Tornado_ALIVE
Date Posted: 25 Oct 05 at 2:34pm
Drive harder does not necessarily mean faster...... More load on the rig / platfrom plus more drag. More power sailing like Hobie 18 compared to efficiency like an A Class. This is just my personal opinion which is based on no real research other than boats I have sailed before and how they felt to me. Therefore I may be wrong, but have the manufactures using these rudders actually tank tested them. And why don't you see them in other development classes including the C Class which is at the forefront of technology. I would love to take an F16 without foils downwind (and around the course) in a variety of wind strenghts / sea state against an F16 with foils and compare boat speed. This I hope would answer some questions. I personaly question weather T foils are benificial. I also believe you can settle a boat and drive a boat hard (and faster) through improved sailing techneques and reading what the boat is and will do, earlier. In summary, I do believe T foils would help reduce pitching a little, but the resulting drag and compramised performance when the T foils are not needed would far out weigh any small benifit they may have. -------------
http://www.formula18alive.com - www.formula18alive.com |
Posted By: Jalani
Date Posted: 25 Oct 05 at 3:01pm
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I agree with you Stephen, the T foils do create some additional drag. However, whilst this is a problem in low wind speeds (2 - 10 knots), I do feel that the benefits vastly outweigh the disadvantages in 12 knots plus. The answer: two sets of rudders! Seriously, having experienced T foils, I'd not go back. Sailing downwind with them, in a blow, fully powered up with the kite pulling is just so fantastic! You can't help but get off the boat with a great big cheesy grin at the ride you've just had whilst everyone else has been down the mine and broken stuff! |
