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solent3
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Posted: Fri Oct 16th, 2009 07:45 pm |
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Hi All
nearly finished my boat and before i do i wondered if any of you chaps have used an auxiliary sail on a similar boat with any success,
cheers............Andy
ps, can i put more than one pic on at a time if so how ?
Last edited on Sun Dec 13th, 2009 09:33 pm by solent3 |
tubatooter1940
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| Joined: | Wed Sep 16th, 2009 |
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| Posts: | 5 |
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Posted: Thu Oct 22nd, 2009 09:59 am |
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| My buddy built a 16 foot sailing dory. I leaned over a bunch under sail which was alarming at first but then it stiffened up and made good speed under sail.
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solent3
Member
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Posted: Thu Oct 22nd, 2009 05:30 pm |
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Cheers for that !
can you tell me what type of sail it was ie sprit / lug etc.
Andy.
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Nauvoo
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| Joined: | Sun Oct 11th, 2009 |
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Posted: Fri Oct 23rd, 2009 03:54 am |
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Solent3,
I can't tell from the photo - does that hull have any rocker aft, or is the bottom flat at the stern?
If it's purely a planing hull (flat), I'm not sure how well it'll sail - the transom will drag a bit of water. You did say the sail was auxiliary, but even so I'd consider installing a centerboard (or a daggerboard - takes less room) to reduce leeway.
In any event, I'd be tempted to go with a sprit sail, as it's the most bang for the buck and simple to rig and douse.
Beautiful job, by the way.
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solent3
Member
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Posted: Fri Oct 23rd, 2009 08:19 am |
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Hi Nauvoo
thanks for your reply, yes it is a totally flat bottomed boat, i hear what you are saying [re] the dagger board, would a lee board do the job and does it have to be @ 90 degrees to the water or can it be parallel to the hull ?, i like the look of the sprit sail would seem to be the best option for the occasional use it will get,
cheers Buddy.............Andy
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Derek Blay
Member
| Joined: | Fri Sep 23rd, 2005 |
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Posted: Sat Oct 24th, 2009 11:05 am |
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Hi Andy - another Brit here from the Isle of Anglesey
I would be wary of cutting holes for dagger boards etc at this late stage but what about fitting long bilge keels similar to those on some of the Drascombes.
Should be easy to fit to the flat bottom and would also act to protect bottom from abrasion when launching etc..
You could make them detachable to start with to see if they work - they won't be as good as a deep dagger board or keel but I guess you are not expecting dinghy racing results
Regards
Derek Blay
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Nauvoo
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Posted: Sat Oct 24th, 2009 07:24 pm |
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Andy,
Leeboards would work fine, and could be easily removed or tied up when the skiff is under power. You'll have to calculate your hull, rudder and leeboard's centers of lateral resistance and then the rig's center of effort to determine the rigs's and leeboard's best position. BTW, you will have to build some sort of rudder, perhaps designed to be easily removed for when you're running the outboard.
In his Classic Small Craft You Can Build, John Gardner offers a chapter called Balancing the Rig of a Small Sailboat, in which he gives a thorough description on what you'll have to figure out to get the mast and leeboards correctly positioned in the hull to get a balanced helm. He states that due to variables such as hull shape, getting things really right will take some experimenting. Since you're building it all yourself, I'm sure you can devise temporary methods of installation to do this. Amazon happens to have copies of this excellent book, both new and used: http://www.amazon.com/Classic-Small-Craft-You-Build/dp/0913372668/ref=sr_1_1?ie=UTF8&s=books&qid=1256411737&sr=1-1
Having the ability to both sail and power this skiff is an exciting idea - please keep us updated as to your progress.
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solent3
Member
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Posted: Sat Oct 24th, 2009 09:12 pm |
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Hi Derek, i too am an islander
only i suspect that the island of Anglesey is a lot nicer than Portsea island. good idea [re] the bilge keels i`m not sure how big they would have to be ?
cheers...........Andy
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solent3
Member
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Posted: Sat Oct 24th, 2009 09:25 pm |
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Hi Nauvoo
blimey ! there sure is a lot to consider, as for the rudder i thought about fabricating a fixture to fit onto the outboard that can be raised or lowered etc, as Derek said i`me not looking for any sort of dinghy racing performance,
cheers.............Andy
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Derek Blay
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Posted: Sun Oct 25th, 2009 03:41 pm |
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Hello Andy
I'm no boat designer (built a small pram dinghy and a sea kayak) but I guess the bilge keels need to be around 50% of the boats length and 6" deep.
Located as wide apart as the hull shape allows and made from 50mm thick material (laminated marine ply?) tapered down to say 30mm.
Screwed and resin bonded in place.
Only down side I see is that boat may not turn as quickly under power as the keels will try to make it track straight
Can I suggest you have a mooch round the local boatyards/marinas - now the boats will be being brought ashore you should be able to see examples on Drascombes etc.
I once owned a 15' sailing catamaran which used long shallow keels and they worked fine.
Good luck with your project - boat looks great and your garage is just as neat and tidy as mine!
Derek
PS: Anglesey is lovely in summer but in winter!!! - only place I have lived where trees grow horizontal!
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solent3
Member
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Posted: Sun Oct 25th, 2009 04:25 pm |
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Hi Derek,
they sound promising, not as big as i thought, as for the garage its my dad`s, mine looks like an explosion in a junk yard, it gets very windy here too but no horizontal trees thankfully, thanks for all your help Derek, i will post another pic when i have flipped her over and mounted something on the bottom,
Cheers...............Andy.
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tubatooter1940
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Posted: Mon Oct 26th, 2009 01:20 am |
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solent3 wrote: Cheers for that !
can you tell me what type of sail it was ie sprit / lug etc.
Andy.
It had a single mainsail with a small gaf. Not very closewinded but it rowed really well.
toots
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Derek Blay
Member
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Posted: Mon Oct 26th, 2009 05:59 pm |
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Andy
Derek back again re sails
Don't know if it helps but my little pram dinghy had a 35 squ ft balanced lugsail - photo attached.
Gives a reasonable sail area but with low centre of pressure so boat doesn't heel so much.
Also spars are short and can be stored in boat.
2nd photo shows mast stepped through the forward deck - no stays required.
Your sail would obviously need to be bigger - my pot of paint was only 7'-9" long.
Sail was made by local sailmaker for around £85 3 years ago - so I guess you are looking at £150 if you buy one around twice the area.
Regards
Derek Blay
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Derek Blay
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Posted: Mon Oct 26th, 2009 06:32 pm |
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Andy
Tried to send photos but files to big.
If you are interested e-mail me on d.blay@ksl.ie and I will send them direct
Derek
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EIIShayneWard
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