rudder size - Wharram Builders and Friends2024-03-29T09:43:33Zhttp://wharrambuilders.ning.com/forum/topics/rudder-size?commentId=2195841%3AComment%3A136835&feed=yes&xn_auth=noThanks to all of you for your…tag:wharrambuilders.ning.com,2015-10-11:2195841:Comment:1370132015-10-11T15:22:25.104Zjohn jameshttp://wharrambuilders.ning.com/profile/johnjames
<p>Thanks to all of you for your input. My edge glued rudder blank is unacceptable, I will finish shaping it--- shine it up and it will be a lovely souvenir. May be a name plate for the side of my house.</p>
<p>Thanks to all of you for your input. My edge glued rudder blank is unacceptable, I will finish shaping it--- shine it up and it will be a lovely souvenir. May be a name plate for the side of my house.</p> Are you familiar with how the…tag:wharrambuilders.ning.com,2015-10-11:2195841:Comment:1369482015-10-11T15:06:47.493Zkim whitmyrehttp://wharrambuilders.ning.com/profile/kimwhitmyre
Are you familiar with how the wooden boat builders join planks for rudders? Long holes, and brass drifts. When I replaced my t26 rudders, I sprung for Lloyds' rated 3/4" J'oubert: go for it!
Are you familiar with how the wooden boat builders join planks for rudders? Long holes, and brass drifts. When I replaced my t26 rudders, I sprung for Lloyds' rated 3/4" J'oubert: go for it! The Piver trimarans have unde…tag:wharrambuilders.ning.com,2015-10-11:2195841:Comment:1369452015-10-11T02:24:08.691ZAndréshttp://wharrambuilders.ning.com/profile/Andres
<p>The Piver trimarans have undersized rudders, and the rudder in the Pahi 26 and 31 seems small to me, but I have a Tiki 26 and it's rudder is very powerful. The Tiki 30 is a newer design than the Tiki 26, so I suppose it's rudder is at least as efficient. I' m not sure it is a good idea to make bigger rudders, you will have greater wetted surface --so your boat will be slower-- and perhaps you will need more force to change course.</p>
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<p>The Piver trimarans have undersized rudders, and the rudder in the Pahi 26 and 31 seems small to me, but I have a Tiki 26 and it's rudder is very powerful. The Tiki 30 is a newer design than the Tiki 26, so I suppose it's rudder is at least as efficient. I' m not sure it is a good idea to make bigger rudders, you will have greater wetted surface --so your boat will be slower-- and perhaps you will need more force to change course.</p>
<p></p> Thanks for your comments if I…tag:wharrambuilders.ning.com,2015-10-10:2195841:Comment:1370062015-10-10T13:53:37.126Zjohn jameshttp://wharrambuilders.ning.com/profile/johnjames
<p>Thanks for your comments if I had a sheet of three-quarter inch plywood that would certainly be quick and easy but I don't I've got a bunch of 1 inch red cedar planks. Unless I use three-quarter A C from the local lumberyard- marine grade plywood is pretty hard to come by . I drew out the rudder on a piece of Masonite and they really don't look undersized-- and of course there's two of them I'm used to having only one rudder. The design has very efficiently used every scrap of the4by8…</p>
<p>Thanks for your comments if I had a sheet of three-quarter inch plywood that would certainly be quick and easy but I don't I've got a bunch of 1 inch red cedar planks. Unless I use three-quarter A C from the local lumberyard- marine grade plywood is pretty hard to come by . I drew out the rudder on a piece of Masonite and they really don't look undersized-- and of course there's two of them I'm used to having only one rudder. The design has very efficiently used every scrap of the4by8 plywood , I just thought since I was not restricted to a 4 x 8 sheet of plywood and I would make the rudders larger... I'm used to PIVER trimarans- they all have undersized rudders --much improved by going larger.</p> First, why not build them per…tag:wharrambuilders.ning.com,2015-10-10:2195841:Comment:1368352015-10-10T12:49:15.525ZBudget Boaterhttp://wharrambuilders.ning.com/profile/BudgetBoater
<p>First, why not build them per plans? Quick and easy.</p>
<p>Second, the rudders are plenty large by design. Any poor sail trimming on your part will be amplified in the rudders. I had some serious difficulties on my T30 when there was too much lee or weather helm do to lack of proper sail trim, to the point that the autopilot could not steer the boat. That extra rudder area will only make this worse.</p>
<p>Fiberglass on the rudders (and almost everywhere else, for that matter) is for…</p>
<p>First, why not build them per plans? Quick and easy.</p>
<p>Second, the rudders are plenty large by design. Any poor sail trimming on your part will be amplified in the rudders. I had some serious difficulties on my T30 when there was too much lee or weather helm do to lack of proper sail trim, to the point that the autopilot could not steer the boat. That extra rudder area will only make this worse.</p>
<p>Fiberglass on the rudders (and almost everywhere else, for that matter) is for abrasion resistance, not strength (hence the lightweight materials called for.) Below the waterline, it is not uncommon nor unwise, to add an extra layer of e-glass to the bottom where grounding will occur, again for abrasion resistance.</p> Here's my thoughts from the p…tag:wharrambuilders.ning.com,2015-10-09:2195841:Comment:1369992015-10-09T20:32:07.350ZAllen Boselyhttp://wharrambuilders.ning.com/profile/AllenBosely
<p>Here's my thoughts from the peanut gallery.</p>
<p>I would laminate 1/4" ply on both sides and sheath them with 6oz glass cloth.</p>
<p>My reason for this is that it will bring the rudders 30 mm and will add a lot of strength and stiffness to them, give you some material thickness to put a taper on aft of rudders and the 6oz cloth will protect and seal them from moisture, be a good surface for painting and would be minimum weight. </p>
<p>Would be concerned that Red Cedar would be somewhat…</p>
<p>Here's my thoughts from the peanut gallery.</p>
<p>I would laminate 1/4" ply on both sides and sheath them with 6oz glass cloth.</p>
<p>My reason for this is that it will bring the rudders 30 mm and will add a lot of strength and stiffness to them, give you some material thickness to put a taper on aft of rudders and the 6oz cloth will protect and seal them from moisture, be a good surface for painting and would be minimum weight. </p>
<p>Would be concerned that Red Cedar would be somewhat weaker along the grain without some added reinforcement if the rudders took a hit, the 1/4" ply would add a lot of stiffness and ruggedness.</p>
<p>Using enough epoxy & glass cloth to build up them up to 30 mm would weigh more than the 1/4" plywood & 6oz cloth.</p>
<p>The Red Cedar is a bit soft, as is Okoume plywood. I would use 1/4" Hydrotek as it's harder an it would still be lighter than building it up with glass. </p>
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<p>Cheers, Allen</p>