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[Neil 758]

Does anyone know the weight of a typical carbon mast? The Selden data sheet says the S2 is 0.92kg per metre. So times that by 6.13 metres = 5.64kg. Add a bit for spreaders, shrouds, forestay, fittings and halyard and I'd hazard a rough guess at about 6.3kg?
The reason I ask is that I've just weighed my aluminium proctor (Kappa I think??) mast and it only weighed 7.2kg with all the rigging on. I would have thought the weight advantage of a carbon stick would be greater than that. Are my numbers anywhere near correct? Maybe my scales are under-reading..

[Solid Air]

I haven't done a weight comparison of S2 and Kappa, but for equal stiffness a HM carbon tube is typically 50% of the weight of aluminium. Of course, the fittings, halyard, etc aren't lighter, so overall the advantage is less. On the other hand, the biggest reduction is most likely in the top part where HM carbon gets quite skinny; less weight up top means less pitching and tipping.

[Neil 758]

I think things are becoming clearer. On closer inspection, the Selden data sheet I was looking at says that both the Kappa and the carbon S2 are the same weight - 0.92kg per metre. This seems somewhat unlikely.

I found a more up to date Selden catalogue. It states the weight for the Kappa is 0.92kg/m, the S2  is 0.511-1.008 kg/m (whatever that means - how can the weight/m vary by 100%?) and the S3 is 0.43-0.65 kg/m. If the carbon mast weight is actually about 0.6kg/m that would make it about 35-40% lighter than the tin mast, which seems to make more sense.

https://www.google.co.uk/url?sa=t&source=web&rct=j&url=http://www.seldenmast.com/files/1378899452/595-812-E.pdf&ved=2ahUKEwiRwbPt9dLgAhWRShUIHRX2DHsQFjADegQIBhAB&usg=AOvVaw0QY4_0lc7LqCfJVRFuEtlz

[Phil_1193]

the S2  is 0.511-1.008 kg/m (whatever that means - how can the weight/m vary by 100%?)

Parts of the mast are thicker around stress points, at a guess, hence the increase in weight

Same with the S3, its thicker at the bottom so heavier per metre

[Neil 758]

Aah, thanks Phil, that makes sense now.

[gordon Kingston]

sounds a bit like the theory about dinosaurs! from Monty Python