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Chinook carbon extension med
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skyking1231



Joined: 10 Jul 2000
Posts: 185

PostPosted: Sun Dec 03, 2017 1:24 pm    Post subject: Chinook carbon extension med Reply with quote

Anyone have or use one of these ? It says max 28cm....but from the picture online, it looks like you can go up to 32cm (two more holes beyond the 28cm)
Just wondering if i can get 30cm out of it...or is it too little exension in the mast at 30cm. Would hate to get the 48cm one.
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zirtaeb



Joined: 03 Jul 2009
Posts: 3620

PostPosted: Sun Dec 03, 2017 1:48 pm    Post subject: Reply with quote

Always a question of risk reward, one only you can answer by factoring in your experience, skill, aggressiveness, weight, clumsiness, gustiness of winds, and at least a dozen other factors.
I know for me, 160lbs. sailing in sub 60 degree waters, usually at least 1/2 mile from shore, average swim skills but little patience, 35 years of shortboard sailing plus 23 years of windsurfshop experience, I'd never allow less than a minimum of 10" underlap in any of my booms.
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zirtaeb



Joined: 03 Jul 2009
Posts: 3620

PostPosted: Sun Dec 03, 2017 5:18 pm    Post subject: Reply with quote

Boom extensions, it appears most use aluminum. I've seen 3 alus broken and over 20 carbons break.
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joethewindsufa



Joined: 10 Oct 2010
Posts: 880
Location: Montréal

PostPosted: Sun Dec 03, 2017 5:31 pm    Post subject: Reply with quote

thought we was talkin bout extensions ??
with medium in the middle

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skyking1231



Joined: 10 Jul 2000
Posts: 185

PostPosted: Sun Dec 03, 2017 8:44 pm    Post subject: Reply with quote

Sorry....I thought I mentioned it in the original post.

I am looking at SDM extensions. Chinooks med has two more holes beyond the 28cm setting....
I don’t have mine handy to look at....(not even sure if it has the extra holes)
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swchandler



Joined: 08 Nov 1993
Posts: 8409

PostPosted: Sun Dec 03, 2017 9:15 pm    Post subject: Reply with quote

You really need a minimum of 6 inches of extension to stick into the mast. Anything less is questionable.
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zirtaeb



Joined: 03 Jul 2009
Posts: 3620

PostPosted: Sun Dec 03, 2017 9:29 pm    Post subject: Reply with quote

Pst 3 was for base extensions. Anyone who had to deal with warrantees would remember all the broken carbon base extensions.
Very few racers use them. Freestylers can because they mostly under downhaul their sails to use smaller sizing.
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dhmark



Joined: 04 Sep 2007
Posts: 256

PostPosted: Sun Dec 03, 2017 10:02 pm    Post subject: Reply with quote

The extra holes above the marks are there because the SDM collars now have 3 rows of pins. Its a single flexible piece of plastic, the mast compresses the the collar over the upper rows of pins. If you used the old style collars with only 2 pins (1 row), you could get more extension, but less mast extension inside the mast, maybe a bit risky. The newer rdm collars have 2 rows of pins (4 pins), using an old style pin collar allows you to decrease the minimum extension 2 mm, no way to increase the maximum extension.

Last edited by dhmark on Mon Dec 04, 2017 8:02 pm; edited 2 times in total
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skyking1231



Joined: 10 Jul 2000
Posts: 185

PostPosted: Mon Dec 04, 2017 12:01 pm    Post subject: Reply with quote

Chinook got back to me..... answer is ‘no’
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VinceSF



Joined: 05 Apr 2005
Posts: 222
Location: Marin County, CA

PostPosted: Tue Dec 05, 2017 1:45 pm    Post subject: Reply with quote

skyking1231 wrote:
Chinook got back to me..... answer is ‘no’


Not a big surprise. You would be crazy to do so.
If you have a broken mast laying around cut the top and bottom to make you a small extension to place on top of your mast.

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