Forums > Windsurfing   Gps and Speed talk

Moreton Bay Mob slap down the guantlet

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Created by nebbian > 9 months ago, 18 Apr 2008
nebbian
WA, 6277 posts
18 Apr 2008 7:43PM
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http://gpsteamchallenge.com.au/showsession.php?date=2008-04-18&team=6

They're well out in front now, although I saw some of the manbra blobs packing up so their posts could change things slightly.


decrepit
WA, 12767 posts
18 Apr 2008 8:36PM
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We're not going to affect things at the top, best we might do is go from 5th to 4th

elmo
WA, 8868 posts
19 Apr 2008 7:47AM
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Nice one guys, good to see your seasons finally started

sailquik
VIC, 6165 posts
20 Apr 2008 1:23AM
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Yes but at the cost of a broken boom each and one destroyed sail for Craig.

I need to find a solution for broken booms besides just buying new ones. This is the third one I have destroyed since October last year and all have been the same size, 162-222. Again almost nothing to salvage on this one, maybe the rear end....
Then again if I could avoid hitting the bottom with my fin at high speeds it would help..... a lot!

I am going to have to have a talk with Tom Chalko about his breakaway harness lines.....

tim90
WA, 66 posts
20 Apr 2008 12:06AM
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just a suggestion, sailquick, but perhaps try a MS boom or NP X9 (180-230or higher, for NP) They seem to be the best out there in terms of stiffness, and as far as I've heard/experienced, durability.

yoyo
WA, 1646 posts
20 Apr 2008 5:46AM
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Andrew,
It puzzles me why something similar to a ski binding spring connection has not been designed for the boom head. Get Tom to work on that over the winter and he will make a killing selling them at the next speedweek in spring.

sailquik
VIC, 6165 posts
20 Apr 2008 10:37AM
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tim90 said...

just a suggestion, sailquick, but perhaps try a MS boom or NP X9 (180-230or higher, for NP) They seem to be the best out there in terms of stiffness, and as far as I've heard/experienced, durability.


Well, I have considered the option of stronger booms but I know from experience that if it is not the boom that breaks it is the harness or harness lines or something else. If I beef up those parts I don't want that 'something else' to be part of my body!

sailquik
VIC, 6165 posts
20 Apr 2008 10:42AM
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yoyo said...

Andrew,
It puzzles me why something similar to a ski binding spring connection has not been designed for the boom head. Get Tom to work on that over the winter and he will make a killing selling them at the next speedweek in spring.


Tom has been working on various ideas for breakaway harness lines for some time and has tested a number of different ideas. One of the difficulties is finding a way to set the breakaway force to the right magnitude. One obviously does not want them to break during any level of normal sailing, but you do want them to break before the boom or anything else. I think he has just about got it now.

25
WA, 319 posts
20 Apr 2008 8:49AM
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We have relinquished it!
This is an official SRM call to arms!
That spot just past the bottom end of the new railway line.
Today - late morning / early arvo.
Dare I say it looks like it might be pretty good!. Probably better that I don't.
We need to work on distance, miles, alphas and hours.
Snides is leading the charge - packin his trailer as we speak!

nebbian
WA, 6277 posts
20 Apr 2008 9:11AM
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sailquik said...



Tom has been working on various ideas for breakaway harness lines for some time and has tested a number of different ideas. One of the difficulties is finding a way to set the breakaway force to the right magnitude. One obviously does not want them to break during any level of normal sailing, but you do want them to break before the boom or anything else. I think he has just about got it now.


When sailing normally, you pull down on the boom.
In the 'whip' part of a catapult, you're pulling up on the boom. (That is, you're above the boom and it's trying to pull you into the mast/sail.) Surely that could be used to trigger the breakaway function?

Problem is finding willing volunteers to test it


Good onya 25, I knew you'd get fired up... if nothing else just to put that cocky pit crew back into their rightful place!

decrepit
WA, 12767 posts
20 Apr 2008 10:11AM
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Nebs, surely by the time you're sailing thru the air, it's too late??????

nebbian
WA, 6277 posts
20 Apr 2008 10:36AM
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Like jumping off a cliff, it's not the fall that kills you, it's the sudden stop at the end

If your harness line breaks as you're above the boom then you'll be thrown clear, like a trebuchet. If it stays connected then you whip around and smack into whatever's below you -- sail or mast. That's my thinking anyway, could be wrong...

yoyo
WA, 1646 posts
20 Apr 2008 2:24PM
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I had another look at Rob1 video of Antoine and Patrik's crashes on the canal. (Slow-mo at 3min mark)



Almost seems one of technique. Antoine doesn't resist and is thrown horizonatally forward , scimming on his back. Patrik is a bit more locked in and by the time he is out of the straps the mast is past the vertical on a downward trajectory and he just gets speared into the canal bottom.

It reminds me a bit of a Myth Busters episode where they tried to build a giant trebuchet using a crane but just speared the dummy into the ground. Need to release before the point of attachment of the harness lines passes the mastfoot. Beyond that , the only way is down.

sailquik
VIC, 6165 posts
20 Apr 2008 6:29PM
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Hmm, Hard to say what caused those dismounts.
I'll start a new thread about high speed crashes.......



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"Moreton Bay Mob slap down the guantlet" started by nebbian