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beaglebuddy
Joined: 10 Feb 2012
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 Posted: Wed Feb 15, 2017 2:16 am Post subject: |
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North claims their base and tendon when used with their Euro pin is actually the shortest base but you are right the tube hanging below the extension on the shox adds several inches, that part moves up and down.
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kevinkan
Joined: 07 Jun 2001
Posts: 1661
Location: San Francisco
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| Posted: Thu Feb 16, 2017 8:00 pm Post subject: |
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| swchandler wrote: | | Definitely a bit different than the norm. It might be just an illusion, but the distance from the bottom of the black plastic cuff of the extension to the deck of the board appears to be greater than a standard Chinook universal, especially since the separation component (Euro-pin or US pinned) is usually incorporated as part of the extension's cuff assembly. |
Yes, it has to be... that's what gives you the travel suspension range. I don't think there's anyway around it, but maybe somebody will think of something?
I didn't measure how low profile the North Uni was before I shipped it to beaglebuddy, but it seemed low profile with a low bend point.
FWIW, the Streamlined Euro Pin uni I just measured puts the bottom of the mast extension about 3.25" above the deck of the board with a bend point (mid tendon) ~1.9" from the deck of the board.
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Kevin Kan
Sunset Sailboards, San Francisco CA
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swchandler
Joined: 08 Nov 1993
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| Posted: Fri Feb 17, 2017 8:06 pm Post subject: |
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| Maybe the lower position of the tendon is meaningful, but I still have to question the fact that the sail is going to be higher off the deck making it a little more difficult to efficiently endplate the foot of the sail. Like you say though, the shock travel needs the added distance to operate. I guess the proof of the concept relies on the compliance and dampening of the rig gained in action on the water. It will be interesting to hear back from beaglebuddy after he has had some time to test it out in rougher water.
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beaglebuddy
Joined: 10 Feb 2012
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| Posted: Fri Feb 17, 2017 11:38 pm Post subject: |
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Hardly an difference in height with this tendon base.
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beaglebuddy
Joined: 10 Feb 2012
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| Posted: Fri Feb 17, 2017 11:49 pm Post subject: |
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The center of the pulley wheel is 3/4" higher on the North but that is because the pulley wheel on this Chinook carbon extension hangs down below the flat area on the bottom of the extension where the US cup inserts.
The difference is 3/4" but there is no load on the shox.
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beaglebuddy
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| Posted: Fri Feb 17, 2017 11:56 pm Post subject: |
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3/4"
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kevinkan
Joined: 07 Jun 2001
Posts: 1661
Location: San Francisco
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| Posted: Wed Feb 22, 2017 4:09 pm Post subject: |
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| swchandler wrote: | | Maybe the lower position of the tendon is meaningful, but I still have to question the fact that the sail is going to be higher off the deck making it a little more difficult to efficiently endplate the foot of the sail. Like you say though, the shock travel needs the added distance to operate. I guess the proof of the concept relies on the compliance and dampening of the rig gained in action on the water. It will be interesting to hear back from beaglebuddy after he has had some time to test it out in rougher water. |
That extra distance will diminished some by sail load on the suspension parts and also by sail rake angle. 3/4" difference is pretty small, but it is also compared to a Chinook setup... their unis tend to be higher profile, and their extensions also have the pulley wheels drop fairly low... so not sure what the tradeoff is in terms of rig height off the top of the deck. Perhaps the lowest would be a North or Streamlined standard uni w/ a Chinook extension? Streamlined extensions also get the pulleys really low.
I'm using the North Power.XT 2.0 extension right now, and it puts the sail maybe 8-10mm higher than my previous extensions (North Uni.XT and Streamlined Redline RDM)
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Kevin Kan
Sunset Sailboards, San Francisco CA
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swchandler
Joined: 08 Nov 1993
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| Posted: Wed Feb 22, 2017 8:23 pm Post subject: |
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From what I can tell, the universal used in conjunction with beaglebuddy's Chinook mast extension isn't a Chinook brand universal. Speaking for myself, most of my universals and RDM mast extensions are Chinook's Euro-pin design. My most used Chinook tendon type universals are the stainless steel ones with the single twist-on threaded attachment. They are a pretty low profile design. I'd measure one, but my van has been in the shop for 2 1/2 weeks.
I also have a Chinook stainless steel Euro-pin universal that mounts into Chinook's two screw base assembly. As I recollect, it's a bit higher profile overall. In addition, I still have some Streamlined SDM universals with the 2 pin cup too that I use with older Fiberspar carbon mast extensions (the absolute lightest mast extensions I've ever used). When I get my van back, I'll collect some measurements and post the results.
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kevinkan
Joined: 07 Jun 2001
Posts: 1661
Location: San Francisco
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| Posted: Wed Feb 22, 2017 9:46 pm Post subject: |
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| swchandler wrote: | From what I can tell, the universal used in conjunction with beaglebuddy's Chinook mast extension isn't a Chinook brand universal. Speaking for myself, most of my universals and RDM mast extensions are Chinook's Euro-pin design. My most used Chinook tendon type universals are the stainless steel ones with the single twist-on threaded attachment. They are a pretty low profile design. I'd measure one, but my van has been in the shop for 2 1/2 weeks.
I also have a Chinook stainless steel Euro-pin universal that mounts into Chinook's two screw base assembly. As I recollect, it's a bit higher profile overall. In addition, I still have some Streamlined SDM universals with the 2 pin cup too that I use with older Fiberspar carbon mast extensions (the absolute lightest mast extensions I've ever used). When I get my van back, I'll collect some measurements and post the results. |
ah, you are right! i just looked at beaglebuddy's picture a little more closely. I did measure a couple unis on my desk: Chinook 2-bolt US Cup and Streamlined 2-Bolt US Cup.
the Chinook puts the extension 4" off the deck of the board
the Streamlined puts the extension 3.5" off the deck of the board.
you coming back up to the Bay Area this summer?
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Kevin Kan
Sunset Sailboards, San Francisco CA
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swchandler
Joined: 08 Nov 1993
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| Posted: Thu Feb 23, 2017 3:31 pm Post subject: |
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| Yes, I'm planning on a couple trips up to the Delta. Hope to see you there.
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