Aluminium masts replacing wooden - Wharram Builders and Friends2024-03-19T02:42:05Zhttp://wharrambuilders.ning.com/forum/topics/aluminium-masts-replacing?commentId=2195841%3AComment%3A109814&x=1&feed=yes&xn_auth=noFor those in the UK looking f…tag:wharrambuilders.ning.com,2013-11-12:2195841:Comment:1098142013-11-12T13:52:05.331ZIan Bamseyhttp://wharrambuilders.ning.com/profile/IanBamsey
<p>For those in the UK looking for mast materials, contact Richard Austin Alloys <a href="http://www.raaltd,com" target="_blank">www.raaltd,com</a>. I've just purchased 6m, 101.6OD, 3.25mm wall (10swg) in 6082T6 for £55 + VAT and £20 delivery. </p>
<p>For those in the UK looking for mast materials, contact Richard Austin Alloys <a href="http://www.raaltd,com" target="_blank">www.raaltd,com</a>. I've just purchased 6m, 101.6OD, 3.25mm wall (10swg) in 6082T6 for £55 + VAT and £20 delivery. </p> Hi Copper Dan,
Here is what y…tag:wharrambuilders.ning.com,2012-08-19:2195841:Comment:803402012-08-19T03:29:47.128ZTrevor McKenziehttp://wharrambuilders.ning.com/profile/TrevorMcKenzie
<p>Hi Copper Dan,</p>
<p>Here is what you are looking for ,from the man JW himself. <a href="http://wharram.com/plansupdate.html">http://wharram.com/plansupdate.htm</a>. Hope the link works, its taken from the plan update section of the Wharram website. It says for Tiki 46, if using aluminium, diameter 194mm (same as timber), wall thickness 5-6mm in alloy (timber is 32mm). Am sure this will help.<br/>Cheers Trevor McKenzie</p>
<p>Hi Copper Dan,</p>
<p>Here is what you are looking for ,from the man JW himself. <a href="http://wharram.com/plansupdate.html">http://wharram.com/plansupdate.htm</a>. Hope the link works, its taken from the plan update section of the Wharram website. It says for Tiki 46, if using aluminium, diameter 194mm (same as timber), wall thickness 5-6mm in alloy (timber is 32mm). Am sure this will help.<br/>Cheers Trevor McKenzie</p> D'oh! Of course 200-190 woul…tag:wharrambuilders.ning.com,2011-06-05:2195841:Comment:373402011-06-05T15:49:11.545ZRich Younghttp://wharrambuilders.ning.com/profile/RichYoung
D'oh! Of course 200-190 would be for a 5mm, not 10mm, wall thickness. How typical of me - "almost right" but off by about 100%....
D'oh! Of course 200-190 would be for a 5mm, not 10mm, wall thickness. How typical of me - "almost right" but off by about 100%.... Hi
12.7 meters for the main s…tag:wharrambuilders.ning.com,2011-06-05:2195841:Comment:370742011-06-05T07:31:21.607ZCooper Danhttp://wharrambuilders.ning.com/profile/Tiare
<p>Hi</p>
<p>12.7 meters for the main section, and an extra meter at the top to follow the existing wooden profile. Is a smaller diameter, 150mmOD and will be only 3-5mm walls. I would like to follow existing profile as then I don't have to redo my stay loops at the top</p>
<p>Yes did calc' with 90mm radius, was playing around with sizes and forgot to update.</p>
<p>Am still undecided as the newly rebuilt mast is better then new and the other mast has no problems. But the aluminium is going for…</p>
<p>Hi</p>
<p>12.7 meters for the main section, and an extra meter at the top to follow the existing wooden profile. Is a smaller diameter, 150mmOD and will be only 3-5mm walls. I would like to follow existing profile as then I don't have to redo my stay loops at the top</p>
<p>Yes did calc' with 90mm radius, was playing around with sizes and forgot to update.</p>
<p>Am still undecided as the newly rebuilt mast is better then new and the other mast has no problems. But the aluminium is going for its weight price and wooden masts look great close up but are always a constant maintenance issue here in the tropics.</p> Dan, what length mast are you…tag:wharrambuilders.ning.com,2011-06-05:2195841:Comment:375012011-06-05T07:21:35.429ZDuncan Clausenhttp://wharrambuilders.ning.com/profile/DuncanClausen
Dan, what length mast are you planning - by my calculations you are looking at a 12.7m mast. (the internal radius of the ali section is 0.09 not 0.095 mm but you have come out at the correct mass for a 12.7m section!)
Dan, what length mast are you planning - by my calculations you are looking at a 12.7m mast. (the internal radius of the ali section is 0.09 not 0.095 mm but you have come out at the correct mass for a 12.7m section!) Rich you are right about your…tag:wharrambuilders.ning.com,2011-06-05:2195841:Comment:374992011-06-05T07:03:39.341ZDuncan Clausenhttp://wharrambuilders.ning.com/profile/DuncanClausen
Rich you are right about your maths - for a 10mm wall you should be subtracting a 180mm diameter cylinder, therefore the aluminium mast would have a mass of 242 kg (16.1 kg/m).<br></br>
<br></br>
<cite>Rich Young said:</cite><br />
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/aluminium-masts-replacing#2195841Comment36829"><div>I'm not certain about my math, but I think a 15 meter, 200mm OD, 10mm wall thickness tube of aluminum weighs 124 kg. Calculated volume of a 200mm cylinder,…</div>
</blockquote>
Rich you are right about your maths - for a 10mm wall you should be subtracting a 180mm diameter cylinder, therefore the aluminium mast would have a mass of 242 kg (16.1 kg/m).<br/>
<br/>
<cite>Rich Young said:</cite><br />
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/aluminium-masts-replacing#2195841Comment36829"><div>I'm not certain about my math, but I think a 15 meter, 200mm OD, 10mm wall thickness tube of aluminum weighs 124 kg. Calculated volume of a 200mm cylinder, subtracted volume of a 190mm cylinder to get the volume of the tube walls. Multiplied that by the density of aluminum at 2.7 g/cm and it came out to 124.05kg. Compare that to your wooden mast to see whether it would represent any weight savings?</div>
</blockquote> Thank you for the advice.Have…tag:wharrambuilders.ning.com,2011-06-05:2195841:Comment:373362011-06-05T06:56:02.757ZCooper Danhttp://wharrambuilders.ning.com/profile/Tiare
Thank you for the advice.<br></br>Have just been redoing the sums, much easier to minus two cylinders :)<br></br>Wood m3<br></br>40mm wall<br></br> radius 0.110 0.482962 m3<br></br> radius 0.070 0.195579 m3 -<br></br>--------------<br></br>0.287383 m3<br></br>@600kg/m3<br></br>172.43 kg<br></br><br></br>Alu m3<br></br>10mm wall<br></br>radius 0.100 0.399142 m3<br></br>radius 0.095 0.360226 m3 -<br></br>--------------<br></br>0.075837m3<br></br>@2700kg/m3<br></br>204kg<br></br><br></br>The wooden mast has some very heavy bits of metal capping on the top…
Thank you for the advice.<br/>Have just been redoing the sums, much easier to minus two cylinders :)<br/>Wood m3<br/>40mm wall<br/> radius 0.110 0.482962 m3<br/> radius 0.070 0.195579 m3 -<br/>--------------<br/>0.287383 m3<br/>@600kg/m3<br/>172.43 kg<br/><br/>Alu m3<br/>10mm wall<br/>radius 0.100 0.399142 m3<br/>radius 0.095 0.360226 m3 -<br/>--------------<br/>0.075837m3<br/>@2700kg/m3<br/>204kg<br/><br/>The wooden mast has some very heavy bits of metal capping on the top along with internal stiffening every meter and is glassed.<br/>So the weight difference is minimal.<br/>Am still not sure which way I'll go. Hi Rich
thanks for the reply…tag:wharrambuilders.ning.com,2011-06-05:2195841:Comment:370712011-06-05T06:54:25.258ZCooper Danhttp://wharrambuilders.ning.com/profile/Tiare
<p>Hi Rich </p>
<p>thanks for the reply.</p>
<p>I think that a 200mm minus 190mm cylinders give a wall thickness of 5 mm.</p>
<p>And you would be right regards the weight.</p>
<p>Cheers</p>
<p>Daniel<br></br> <br></br> <cite>Rich Young said:</cite></p>
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/aluminium-masts-replacing?commentId=2195841%3AComment%3A37015&xg_source=msg_com_forum#2195841Comment36829"><div>I'm not certain about my math, but I think a 15 meter, 200mm OD, 10mm wall…</div>
</blockquote>
<p>Hi Rich </p>
<p>thanks for the reply.</p>
<p>I think that a 200mm minus 190mm cylinders give a wall thickness of 5 mm.</p>
<p>And you would be right regards the weight.</p>
<p>Cheers</p>
<p>Daniel<br/> <br/>
<cite>Rich Young said:</cite></p>
<blockquote cite="http://wharrambuilders.ning.com/forum/topics/aluminium-masts-replacing?commentId=2195841%3AComment%3A37015&xg_source=msg_com_forum#2195841Comment36829"><div>I'm not certain about my math, but I think a 15 meter, 200mm OD, 10mm wall thickness tube of aluminum weighs 124 kg. Calculated volume of a 200mm cylinder, subtracted volume of a 190mm cylinder to get the volume of the tube walls. Multiplied that by the density of aluminum at 2.7 g/cm and it came out to 124.05kg. Compare that to your wooden mast to see whether it would represent any weight savings?</div>
</blockquote> 10mm wall thickness is very t…tag:wharrambuilders.ning.com,2011-06-04:2195841:Comment:372952011-06-04T23:49:02.768Zboatsmithhttp://wharrambuilders.ning.com/profile/qe0j3ojqb10
<p>10mm wall thickness is very thick for an aluminum mast. A 7 1/2" tube with a 1/4" wall thickness weighs .56 lbs per inch. 15 meters = 590.6 inches x .56lbs/inch =330lbs x 1 1/2 for 3/8 wall = 496 lbs for 15 meters. HEAVY</p>
<p> </p>
<p> </p>
<p>10mm wall thickness is very thick for an aluminum mast. A 7 1/2" tube with a 1/4" wall thickness weighs .56 lbs per inch. 15 meters = 590.6 inches x .56lbs/inch =330lbs x 1 1/2 for 3/8 wall = 496 lbs for 15 meters. HEAVY</p>
<p> </p>
<p> </p> I'm not certain about my math…tag:wharrambuilders.ning.com,2011-06-04:2195841:Comment:368292011-06-04T19:12:33.040ZRich Younghttp://wharrambuilders.ning.com/profile/RichYoung
I'm not certain about my math, but I think a 15 meter, 200mm OD, 10mm wall thickness tube of aluminum weighs 124 kg. Calculated volume of a 200mm cylinder, subtracted volume of a 190mm cylinder to get the volume of the tube walls. Multiplied that by the density of aluminum at 2.7 g/cm and it came out to 124.05kg. Compare that to your wooden mast to see whether it would represent any weight savings?
I'm not certain about my math, but I think a 15 meter, 200mm OD, 10mm wall thickness tube of aluminum weighs 124 kg. Calculated volume of a 200mm cylinder, subtracted volume of a 190mm cylinder to get the volume of the tube walls. Multiplied that by the density of aluminum at 2.7 g/cm and it came out to 124.05kg. Compare that to your wooden mast to see whether it would represent any weight savings?