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#1
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Argie 10 progress photo's & birdsmouth mast
Took a detour to work on Ocean Planet for two weeks and to make a mast.
Interior is painted. Almost there ! http://home.comcast.net/~jonsailr |
#2
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On Sat, 14 Aug 2004 22:16:33 -0400, Jonathan
wrote: Took a detour to work on Ocean Planet for two weeks and to make a mast. Interior is painted. Almost there ! http://home.comcast.net/~jonsailr Nicely illustrated! But the mast uses 9 45 degree segments? you have a gap or two, I reckon. Brian Whatcott |
#3
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No, it uses 8. I used 1x4 fir decking and got 3 strips per board, and I
inadvertently used all nine instead of discarding one In the process of clearing a space to lay out the mast for gluing, checking all of the 45 degree cuts for full cut through (my saw depth changed without my input after the first 4 cuts, and two strips had to be cleaned up with a Sandvick scraper) I forgot to discard one of the lengths I was wondering why the hose clamps I used to glue it up were suddenly too short when they had plenty of room on my test, a 2 foot spar..... *Fortunately*?, my epoxy mix was thick enough to fill most of the gaps. There are a few places I will use the West syringes to fill some hairline spaces. I was wondering if anyone would catch that goof Jonathan Brian Whatcott wrote: On Sat, 14 Aug 2004 22:16:33 -0400, Jonathan wrote: Took a detour to work on Ocean Planet for two weeks and to make a mast. Interior is painted. Almost there ! http://home.comcast.net/~jonsailr Nicely illustrated! But the mast uses 9 45 degree segments? you have a gap or two, I reckon. Brian Whatcott |
#4
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No, it uses 8. I used 1x4 fir decking and got 3 strips per board, and I
inadvertently used all nine instead of discarding one If you hadn't used all 9, you would have screwed one up and needed the extra. You just took out an insurance policy, that's all. ;-) Steve "speaking from experience...." |
#5
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Stephen Baker wrote:
No, it uses 8. I used 1x4 fir decking and got 3 strips per board, and I inadvertently used all nine instead of discarding one If you hadn't used all 9, you would have screwed one up and needed the extra. You just took out an insurance policy, that's all. ;-) Steve "speaking from experience...." The biggest problem was that the "extra" pushed the circumference out to the barely outer limits of the hose clamps I used as clamps. Some I could get four turns of the screw on, some I couldn't get to bite at all. And the mess??? a new personal record! even got epoxy in my hair (wiped hair out of my eyes in frustration, forgetting one time....) BTW check out the August "Offshore" magazine for an article named "Passings", second place in their writers contest Jonathan -- I am building a Dudley Dix, Argie 10, for my daughter. Check it out: http://home.comcast.net/~jonsailr |
#6
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Jonathan says:
And the mess??? a new personal record! even got epoxy in my hair (wiped hair out of my eyes in frustration, forgetting one time....) Doooood! Good job. ;-) BTW check out the August "Offshore" magazine for an article named "Passings", second place in their writers contest Are you blowing your own horn again, Jonathan? Well, no-one else is going to do it. Congrats! Steve |
#7
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Ah yes: that explains it.
I was interested in the fishmouth approach - I hadn't run across this method before. I started by asking myself: Why wouldn't I saw on a 22.5 degree angle? This would be economical in the spar material: only the kerf would be lost. But visualizing the clamp up, it would be a nightmare, I'm su the fishtail approach is largely self aligning I'd think. And your approach ought to be very warp resistant. I recall that the 2 part sandwich approach that I used allowed a little bowing to show up after a year or two. I also recall that a hollow shaft loses 5% of its strength (in torque) while losing 25% of its weight, for a 50% of radius, hole. Brian Whatcott Altus OK On Sun, 15 Aug 2004 06:54:41 -0400, Jonathan wrote: No, it uses 8. I used 1x4 fir decking and got 3 strips per board, and I inadvertently used all nine instead of discarding one In the process of clearing a space to lay out the mast for gluing, checking all of the 45 degree cuts for full cut through (my saw depth changed without my input after the first 4 cuts, and two strips had to be cleaned up with a Sandvick scraper) I forgot to discard one of the lengths I was wondering why the hose clamps I used to glue it up were suddenly too short when they had plenty of room on my test, a 2 foot spar..... *Fortunately*?, my epoxy mix was thick enough to fill most of the gaps. There are a few places I will use the West syringes to fill some hairline spaces. I was wondering if anyone would catch that goof Jonathan Brian Whatcott wrote: On Sat, 14 Aug 2004 22:16:33 -0400, Jonathan wrote: Took a detour to work on Ocean Planet for two weeks and to make a mast. Interior is painted. Almost there ! http://home.comcast.net/~jonsailr Nicely illustrated! But the mast uses 9 45 degree segments? you have a gap or two, I reckon. Brian Whatcott |
#8
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This guy Frank Hagan has a good illustration of the "proper" birdsmouth
set up, as well as a number of tips in building. http://users2.ev1.net/~fshagan/bm.htm In the horror show I created by not thinking to count my pieces, I got frustrated enough to overlook one of his other caveats, which was to have the screw part of the hose clamps in various parts of the mast instead of aligning them. If you inadvertently align them, you seem to put enough pressure on *one* strip that induces a slight bow in the mast. I plan to set the spar so that the bow is bowing aft and I will explain that in an unstayed rig I wanted to "pre-bend" for sail shape, as there is no backstay to shape the mast with. I'm not sure I can sell that to my 12 year old, she's pretty good at sniffing my BS but, it's worth a shot Jonathan Brian Whatcott wrote: Ah yes: that explains it. I was interested in the fishmouth approach - I hadn't run across this method before. I started by asking myself: Why wouldn't I saw on a 22.5 degree angle? This would be economical in the spar material: only the kerf would be lost. But visualizing the clamp up, it would be a nightmare, I'm su the fishtail approach is largely self aligning I'd think. And your approach ought to be very warp resistant. I recall that the 2 part sandwich approach that I used allowed a little bowing to show up after a year or two. I also recall that a hollow shaft loses 5% of its strength (in torque) while losing 25% of its weight, for a 50% of radius, hole. Brian Whatcott Altus OK On Sun, 15 Aug 2004 06:54:41 -0400, Jonathan wrote: No, it uses 8. I used 1x4 fir decking and got 3 strips per board, and I inadvertently used all nine instead of discarding one In the process of clearing a space to lay out the mast for gluing, checking all of the 45 degree cuts for full cut through (my saw depth changed without my input after the first 4 cuts, and two strips had to be cleaned up with a Sandvick scraper) I forgot to discard one of the lengths I was wondering why the hose clamps I used to glue it up were suddenly too short when they had plenty of room on my test, a 2 foot spar..... *Fortunately*?, my epoxy mix was thick enough to fill most of the gaps. There are a few places I will use the West syringes to fill some hairline spaces. I was wondering if anyone would catch that goof Jonathan Brian Whatcott wrote: On Sat, 14 Aug 2004 22:16:33 -0400, Jonathan wrote: Took a detour to work on Ocean Planet for two weeks and to make a mast. Interior is painted. Almost there ! http://home.comcast.net/~jonsailr Nicely illustrated! But the mast uses 9 45 degree segments? you have a gap or two, I reckon. Brian Whatcott -- I am building a Dudley Dix, Argie 10, for my daughter. Check it out: http://home.comcast.net/~jonsailr |
#9
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I just finished up a 15 ft. X 2.5 inch mast and an 11 ft. gaff spar
using this method and am well satisfied. I constructed a "spar lathe" from directions in the jan 2004 Wooden Boat Magazine that made sanding the mast a 50 minute or so affair. The rig turns the mast at about 200 RPM while I walked up and down with a belt from a belt sander turned inside out. The Arch Davis Designed Penobscot 17 the spars are for goes in the water Labor Day Wekend. Sometime after I'll post a site with the details. Great design, fun to build, and (hopefully) fun to sail! Jeff Jonathan wrote: This guy Frank Hagan has a good illustration of the "proper" birdsmouth set up, as well as a number of tips in building. http://users2.ev1.net/~fshagan/bm.htm In the horror show I created by not thinking to count my pieces, I got frustrated enough to overlook one of his other caveats, which was to have the screw part of the hose clamps in various parts of the mast instead of aligning them. If you inadvertently align them, you seem to put enough pressure on *one* strip that induces a slight bow in the mast. I plan to set the spar so that the bow is bowing aft and I will explain that in an unstayed rig I wanted to "pre-bend" for sail shape, as there is no backstay to shape the mast with. I'm not sure I can sell that to my 12 year old, she's pretty good at sniffing my BS but, it's worth a shot Jonathan Brian Whatcott wrote: Ah yes: that explains it. I was interested in the fishmouth approach - I hadn't run across this method before. I started by asking myself: Why wouldn't I saw on a 22.5 degree angle? This would be economical in the spar material: only the kerf would be lost. But visualizing the clamp up, it would be a nightmare, I'm su the fishtail approach is largely self aligning I'd think. And your approach ought to be very warp resistant. I recall that the 2 part sandwich approach that I used allowed a little bowing to show up after a year or two. I also recall that a hollow shaft loses 5% of its strength (in torque) while losing 25% of its weight, for a 50% of radius, hole. Brian Whatcott Altus OK On Sun, 15 Aug 2004 06:54:41 -0400, Jonathan wrote: No, it uses 8. I used 1x4 fir decking and got 3 strips per board, and I inadvertently used all nine instead of discarding one In the process of clearing a space to lay out the mast for gluing, checking all of the 45 degree cuts for full cut through (my saw depth changed without my input after the first 4 cuts, and two strips had to be cleaned up with a Sandvick scraper) I forgot to discard one of the lengths I was wondering why the hose clamps I used to glue it up were suddenly too short when they had plenty of room on my test, a 2 foot spar..... *Fortunately*?, my epoxy mix was thick enough to fill most of the gaps. There are a few places I will use the West syringes to fill some hairline spaces. I was wondering if anyone would catch that goof Jonathan Brian Whatcott wrote: On Sat, 14 Aug 2004 22:16:33 -0400, Jonathan wrote: Took a detour to work on Ocean Planet for two weeks and to make a mast. Interior is painted. Almost there ! http://home.comcast.net/~jonsailr Nicely illustrated! But the mast uses 9 45 degree segments? you have a gap or two, I reckon. Brian Whatcott |
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