| |  Re: A bunch of Nacra Inter 20 questions
[Re: timtower]
#249871
06/20/12 02:52 PM 06/20/12 02:52 PM |
Joined: Jun 2001
Posts: 12,310
South Carolina Jake 
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2001
Posts: 12,310
South Carolina | I understand the Nacra 20 is supposed to have a pole length of about 144". With the tack block around 143".
It seems that it's hard to get adequate luff tension on an OD spinnaker. Should I make my pole a little longer? Any anyone know by how much? Just lower the pole by shortening the end-pole bridles. As mentioned earlier, you will also reduce the stress on the pole by no longer using the welded forestay hoop for it. Replace that with a short loop of line tied to that hoop and two more mid-pole bridles out to the forestay bridle tangs on the hull. You can make all of these lines out of vectran and save on the cost of custom steel wires (and you can adjust the lengths).
Jake Kohl
| | | Re: A bunch of Nacra Inter 20 questions
[Re: Jake]
#249912
06/22/12 05:32 AM 06/22/12 05:32 AM |
Joined: Sep 2005
Posts: 893 waynemarlow
old hand
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old hand
Joined: Sep 2005
Posts: 893
| Guys, why all the bother in finding old masts etc when you will find that mast won't fit any of the fittings. Standard Ali tube is plentiful and cheap and local. On line and shipping usual gets it to your door in a few days in either 2.5m or 5m lengths.
No you don't need any fancy paint or such on it or if you do for aesthetic reasons then get it locally powder coated, it lasts and is tough and dead cheap and again local.
Carbon or glass as a spinny pole is no stronger than Ali and in many ways more prone to breakage when bounced into by the flying crew. An Ali pole will bend and deform but won't just shatter.
Last edited by waynemarlow; 06/22/12 05:33 AM.
| | | Re: A bunch of Nacra Inter 20 questions
[Re: waynemarlow]
#249915
06/22/12 06:45 AM 06/22/12 06:45 AM |
Joined: Jun 2001
Posts: 12,310
South Carolina Jake
Carpal Tunnel
|
Carpal Tunnel
Joined: Jun 2001
Posts: 12,310
South Carolina | Guys, why all the bother in finding old masts etc when you will find that mast won't fit any of the fittings. Standard Ali tube is plentiful and cheap and local. On line and shipping usual gets it to your door in a few days in either 2.5m or 5m lengths.
No you don't need any fancy paint or such on it or if you do for aesthetic reasons then get it locally powder coated, it lasts and is tough and dead cheap and again local.
Carbon or glass as a spinny pole is no stronger than Ali and in many ways more prone to breakage when bounced into by the flying crew. An Ali pole will bend and deform but won't just shatter. The sunfish part (mast, boom, whatever that is) is quite economical even from a sunfish dealer. It's much cheaper than buying (and shipping) a raw aluminum extrusion. Bonus is that the sunfish part is anodized too. The Nacra extrusion is over $400 before you put any hardware on it (this may include shipping).
Jake Kohl
| | | Re: A bunch of Nacra Inter 20 questions
[Re: timtower]
#249928
06/22/12 01:53 PM 06/22/12 01:53 PM |
Joined: Dec 2006
Posts: 2,490
On the Water P.M.
Pooh-Bah
|
Pooh-Bah
Joined: Dec 2006
Posts: 2,490
On the Water | Metal Supermarket does not have 12 foot tubing. Tim, all you need is a socket wrench and a couple of beers to take it apart.
Philip
USA #1006
| | | Re: A bunch of Nacra Inter 20 questions
[Re: timtower]
#249930
06/22/12 02:12 PM 06/22/12 02:12 PM |
Joined: Jun 2001
Posts: 12,310
South Carolina Jake
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2001
Posts: 12,310
South Carolina | Pause on the spinnaker pole for a second. I need to move my boat upcountry and it's not looking like a trailer is going to be an option, how hard is it to take the boat apart? It's not that hard. What Phil said - a large hex key for the front bolts and a socket for the rear bolts is all you need. Be sure to use an anti-seize agent on the bolts when you put them back in (a healthy dose of lithium grease or other). There have been some stripping issues with those bolts so turn them slowly to not overheat the threads.
Jake Kohl
| | | Re: A bunch of Nacra Inter 20 questions
[Re: waynemarlow]
#249931
06/22/12 02:18 PM 06/22/12 02:18 PM |
Joined: Jun 2001
Posts: 12,310
South Carolina Jake
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2001
Posts: 12,310
South Carolina | http://www.aluminiumwarehouse.co.uk/Aluminium-Round_Tube/c120_131/p3116/Aluminium_Round_Tube_%286082T6%29_1%3Csmall%3E%3Csup%3E1%3C/sup%3E/%3Csub%3E4%3C/sub%3E%3C/small%3E_in_x_14_swg/product_info.html
£ 5.85 for a 2.5m length, cheap enough and I'm sure you will have the same in the States, probably as usual, what we pay in £'s you pay in $'s I work at a machine manufacturer that buys about $5 Million in steel and aluminum annually. We pay almost $0.50 per inch of similar tubing before shipping/freight making a 12' tube $72 USD. The freight on that would probably be $40 to $60 because of the length. I can't believe you can get that tube for a $10 USD equivalent.
Jake Kohl
| | | Re: A bunch of Nacra Inter 20 questions
[Re: timtower]
#249935
06/22/12 06:14 PM 06/22/12 06:14 PM |
Joined: Jun 2001
Posts: 12,310
South Carolina Jake
Carpal Tunnel
|
Carpal Tunnel
Joined: Jun 2001
Posts: 12,310
South Carolina | Although, if I did find a metal fab shop, they could make it to length I specify instead of chopping the sunfish boom It's really pretty easy to cut with a hacksaw and a miter box. But..either way. CALLING DAVID INGRAM! I've looked but can't find that I20 site you used to have up with all the line lengths...where might we find that? Tad? anyone?
Jake Kohl
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