Skinny extension "improvement"

> 10 years ago
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CJW
CJW
NSW
1731 posts
CJW CJW
NSW, 1731 posts
4 Nov 2006 4:09pm
Recently as per the photo (link below) I bent my skinny mast extension. How it happened is still a mystery, it was certainly not during some major 'incident' and I only ever run it up to mid extension (middle hole). Anyway it got me thinking. I've got quite a few broken top section laying around in the garage (also see photo) and coincidently they are exactly the same diameter ;) Now I haven't run any calculations on it (not that I know the loads it experiences anyway) but I was wondering if anyone else has tried this. By 'this' I mean replacing the aluminium section with a carbon piece from an old top section? To me it looks like a winner :P

I might do a quick calc to compare the top section bending stiffness to the alu section just to make sure i'm not being slightly optimistic but I reckon she'll be right; using 'rule of thumb' engineering :D

So yeah, been done before? Results?

pic /images/misc/forum-image-missing.gif
Haircut
Haircut
QLD
6491 posts
QLD, 6491 posts
4 Nov 2006 3:22pm
if it is a prolimit one, they are apparently quite soft alloy and bend easily. The blue anodized chinook ones seem to be the pick of them for strength. About $170 but i think they only come in chinook cup type, and not euro pin
nebbian
nebbian
WA
6277 posts
WA, 6277 posts
4 Nov 2006 1:23pm
What brand is that extension? Just so I can avoid it in future

You might have trouble making the hole area in the carbon strong enough, but then again I could be talking out my ar$e. Suck it and see, what's there to lose?
qwerty
qwerty
NSW
807 posts
NSW, 807 posts
4 Nov 2006 5:38pm
hey CJW,
off the topic a bit, do you have a spare uni joint for Whyner?
Looks like its going to be on at Peggys tomorrow (Sunday).
If not, no worries, but otherwise we'll see you there.
CJW
CJW
NSW
1731 posts
CJW CJW
NSW, 1731 posts
4 Nov 2006 7:10pm
Yeah it's a pro limit one, fairly think wall ally (3mm+) but looks like a fairly low grade. I'll give it a crack, worst that could happen is a bit of a swim :P

qwerty I've got a spare uni with the cup style (not pin) connector. Can use the whole extension if need be but it won't work with a skinny mast. Don't have a spare pin uni.

Low tide is 2pm I think, swell should be up too tomorrow. Just had a quick session at Peggy's then, flat as.
ma
ma
NSW
375 posts
ma ma
NSW, 375 posts
5 Nov 2006 2:07pm
I have the same extension and bent it 6 months ago, Im pretty sure it bent over the rail of board in white water. I bent it back straight in a vice and have had no problems since but it would have weakened it for sure.
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