I've recently begun upgrading my masts to 90-100% carbon content, having experienced first-hand enormous benefits that make the extra cost worthwhile. As an average Joe freerider I have no intention of buying carbon extensions due to their high cost, but I was just wondering whether there is potential to damage a carbon mast when using it with an aluminium extension?

I assume that an aluminium extension is 100% rigid with no flex. I also assume that an advantage of a carbon extension when used in conjunction with a carbon mast is that it will flex, hence perfecting the curvature of the full length of the mast how it was intended, to maximise the performance of the sail.

Does the bottom 20-30 cm of a carbon mast flex? Does a carbon mast extension flex? If they do flex is there potential for damage using an extension that presumably doesn't flex?

It's just not a problem. Been using alloy extensions and 100% carbon masts for years.

RDM or SDM? Don't think it matters anyhow.........

All the answers above are correct. Also, bending forces are the least on the ends, the most in the middle. Almost all the force on an extension is in compression (downhaul). Think about it: bridges (sticks, toothpicks, etc.) fail in the middle, not the ends.

sailquik said..
It's just not a problem. Been using alloy extensions and 100% carbon masts for years.

RDM or SDM? Don't think it matters anyhow.........

What he said.

write this dude.

[email protected]

Ditto,
Carbon looks cool but ally cheaper and more reliable... bugger all weight difference and it is in a location where it doesn't matter anyway.

Never leave your extension in the mast for storage though.
Corrosion will occurs and damage the mast.