tag:blogger.com,1999:blog-5087283544997030082.post3355158822185299976..comments2024-02-14T20:17:15.115+00:00Comments on Chertsey: Which wood would be good?Sarahhttp://www.blogger.com/profile/01759448161130667128noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-5087283544997030082.post-5583256098257328232010-02-17T09:42:24.942+00:002010-02-17T09:42:24.942+00:00Thanks Blossom, that's the lines I was thinkin...Thanks Blossom, that's the lines I was thinking along, of using a barrier. I'm not sure how long Chertsey has been totally gunnel-less but I'm guessing that's probably contributed to the good condition that the angle is in.Sarahhttps://www.blogger.com/profile/01759448161130667128noreply@blogger.comtag:blogger.com,1999:blog-5087283544997030082.post-90438856640710519412010-02-16T22:41:14.200+00:002010-02-16T22:41:14.200+00:00Sarah personally I don't know what all the fus...Sarah personally I don't know what all the fuss is about for while I agree that Oak contains Tannin acid and as we know acid attacks metal all I would say is to look at the present condition of your 3" x 2.5" Gunwale angles.(I am going by your photo's) Chertsey is now nearly 75 years old and has probably had Oak gunwales for most of it's life so I think you can safely say that if you fit Oak gunwales properly then it should last at least another 75 years perhaps. When I replaced some of the gunwales on Bingley I used oak and laid it on top of a layer of tarred felt. The felt was the hairy sandy coloured type you used to buy from plumbers/builders merchants which was 3" wide and on a roll. This was stuck to the gunwale angle with a good coat of hot pitch and tar mix(osmukanta) then the top surface of the felt coated in the same manner then the pre drilled oak gunwale quickly positioned on top and the tarred felt then sandwiched between both by fitting and tightening all the bolts. I totally agree with any comments on Keruing. I built Bingley's back cabin using this timber and all I can say is I was continually sharpening saws and chisels and every single splinter (and it makes loads) went septic. It oozed a resinous sap and the tongue and grooves all opened up as it shrank!Blossomhttps://www.blogger.com/profile/02926264556165848005noreply@blogger.comtag:blogger.com,1999:blog-5087283544997030082.post-26398407068216824852010-02-16T09:35:13.543+00:002010-02-16T09:35:13.543+00:00Sarah, It's the Tannin and damp that forms Tan...Sarah, It's the Tannin and damp that forms Tannic Acid and that rots the iron. The reason I went for Oak cants is, Iroko does't bend easy, it just splits, Oak is bit more plyable but you have to watch the grain.<br />I also used "gutter seal" between the iron and the wood. <br />There is another wood called Idigbo, very simular to Oak and cheaper but also contains Tannin.fmc dovehttps://www.blogger.com/profile/00576141798497354371noreply@blogger.comtag:blogger.com,1999:blog-5087283544997030082.post-12537048882547189922010-02-16T08:45:18.316+00:002010-02-16T08:45:18.316+00:00Andrew - is that specifically oak rather than wate...Andrew - is that specifically oak rather than water corrosion - does it have a particular quality? And it seems it didn't stop you using oak again for the cants?<br /><br />Is it possible to isolate the wood from the metal, with the gunnels?<br /><br />Right, definitely not keruing then at any rate. Sounds horrible!Sarahhttps://www.blogger.com/profile/01759448161130667128noreply@blogger.comtag:blogger.com,1999:blog-5087283544997030082.post-44396467559320940612010-02-16T08:33:25.862+00:002010-02-16T08:33:25.862+00:00Thanks, that's really useful info.Thanks, that's really useful info.Sarahhttps://www.blogger.com/profile/01759448161130667128noreply@blogger.comtag:blogger.com,1999:blog-5087283544997030082.post-20348158056698824602010-02-15T20:29:07.767+00:002010-02-15T20:29:07.767+00:00Oh, I forgot, if you want to see the effect that O...Oh, I forgot, if you want to see the effect that Oak has on Iron have look at my Picasaweb (restoration of Dove "The Front")You can see where the Cants have been.fmc dovehttps://www.blogger.com/profile/00576141798497354371noreply@blogger.comtag:blogger.com,1999:blog-5087283544997030082.post-19337225915431992762010-02-15T20:27:15.745+00:002010-02-15T20:27:15.745+00:00Brinklow Boats use iroko partly I think because th...Brinklow Boats use iroko partly I think because they can't get long enough lengths of oak - you want as few joints as possible.<br /><br />Keruing is durable but horrible wood - leaks loads of resin for the first couple of years and splinters turn septic.Paul NB Capricornnoreply@blogger.comtag:blogger.com,1999:blog-5087283544997030082.post-53049368899582440122010-02-15T20:23:05.804+00:002010-02-15T20:23:05.804+00:00According to the likes of George Wain in the worki...According to the likes of George Wain in the working days the cappings didn't last that long, so the the effects of Tanic acid didn't really come into it. They were looking for durabilty and Oak was widely available. I think for a restored boat the cappings could last anything like 10 to 15 years and tannin would be a problem.<br />On Dove we went for Iroko, cheaper, just as durable and no Tannin.<br />Andrewfmc dovehttps://www.blogger.com/profile/00576141798497354371noreply@blogger.com