Carbon fibre bowsprit. How strong? How thick the wall?

[snooks]

You seem to have a big eye for your tack there already ;0)

You just need a UHMPE loop on the top which won't affect the anchor's performance and a way of securing the anchor down.

 

[Martin_W_Brown]

I think you need the d^4 formula to work out the equivalent tube needed:
http://www.engineeringtoolbox.com/area-moment-inertia-d_1328.html
Strength is proportional to D^4 - d^4
So, as an example, if the original tube is 100mm diameter with 1mm wall you'll get the same bending strength from a solid tube of 52.8mm diameter (please check my maths!)

 

[knuterikt]

The sizing table for genakker furler from Selden suggest that you should use the GX25 for a cruising chute for your boat, the GX25 have a max working load of 25 kN.
http://www.seldenmast.com/en/products/code_0_and_gennaker_furling.html

If you assume that the max load of 25 kN is along the line between tack and head you should be able to calculate the load components on the bowsprit (bend and compression)

 

[tudorsailor]

The sizing table for genakker furler from Selden suggest that you should use the GX25 for a cruising chute for your boat, the GX25 have a max working load of 25 kN.
http://www.seldenmast.com/en/products/code_0_and_gennaker_furling.html

If you assume that the max load of 25 kN is along the line between tack and head you should be able to calculate the load components on the bowsprit (bend and compression)

This is really most useful. I will now hunt to find a company that can manufacture a carbon fibre tube that can withstand 25kN load. If I avoid the word "marine" it may be more affordable!

I will report back......

TudorSailor