Is Carbon good for mast struts?
Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=10842
Printed Date: 16 Jul 25 at 7:36pm
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Topic: Is Carbon good for mast struts?
Posted By: AlanH
Subject: Is Carbon good for mast struts?
Date Posted: 23 Apr 13 at 2:04pm
| Just bought an Osprey, with carbon spars and foils. Would like to change the mast strut from alloy to carbon to complete the look. But... is carbon good at resisting crushing presures along the tube? Guess that's quite a different characteristic to its ability to resist lateral bends across the length of tube? Any advice from technical types welcomed. |
Replies:
Posted By: JimC
Date Posted: 23 Apr 13 at 2:12pm
| Yes. |
Posted By: Daniel Holman
Date Posted: 23 Apr 13 at 2:59pm
|
Yep Jim is absolutely correct.
Resistance to buckling due to axial compression is a function of length of strut, Young's modulus and section inertia. In an application where the part would be expected to operate in a post buckled state, then the ratio of zero axis and off axis fibres would need to be considered in particularly thin walled applications, but I suspect this will be fine in a little strut. Just ensure that what you get fits the end pieces well, and that the load is taken by the strut and end pieces, not by any screws or rivets attaching the strut. If using mech fasteners take care to drill appropriate guide holes to te fastener, else it is easy to damage the laminate. |
Posted By: tick
Date Posted: 23 Apr 13 at 4:34pm
|
self adhesive fake carbon...... |
Posted By: Thunder Road
Date Posted: 23 Apr 13 at 4:37pm
|
Black paint? ------------- Finn GBR16 Thunder Road. |
Posted By: Jack Sparrow
Date Posted: 23 Apr 13 at 6:56pm
replacing with carbon tube is a waist of money edit: and it's going to get clobbered by the jib clew all the time. And carbon doesn't like that sort of thing. ------------- http://www.uk3-7class.org/index.html" rel="nofollow - Farr 3.7 Class Website https://www.facebook.com/groups/1092602470772759/" rel="nofollow - Farr 3.7 Building - Facebook Group |
Posted By: AlanH
Date Posted: 23 Apr 13 at 7:21pm
| Thanks for input guys. I had a feeling there might be some downside, and getting battered by a metal clew doesn't sound nice. Just weighed the alloy strut, its only about 300g, so not much weight saving on offer. I was going to recycle broken tiller ext as a strut so wouldn't cost much, but think I'd best stay with the old tech here. Pimping is a bit of a luxury. |
Posted By: Mike Holt
Date Posted: 23 Apr 13 at 10:24pm
| Been using carbon ones on 505's for years. No problem using them, but more because they look good than any advantage. |
Posted By: JimC
Date Posted: 23 Apr 13 at 10:44pm
|
Posted By: Thunder Road
Date Posted: 24 Apr 13 at 9:17am
------------- Finn GBR16 Thunder Road. |
Posted By: Neptune
Date Posted: 24 Apr 13 at 9:30am
|
depend if your trapezing and don't let go when you miss the hook....funny how for the first couple of times your mind thinks keeping hold is a good thing! ------------- Musto Skiff and Solo sailor |