I'm considering using Hyspan pine planks to make a mast from. These are radiata pine, laminated from rotary cut veneer , building planks! I can get them up to 13 metres long!
According to the manufacturers engineer they are stronger and stiffer than pine f7 f10 building grade timber, so very strong indeed. Here's a link ...http://www.chhwoodproducts.co.nz/hyspan/
These are 45mm thick and can be had from 150mm to 600mm wide.
I think they would need tapering in thickness towards the top of the mast to get some flex into it. May even need to be reduced in thickness all the way along actually, being so strong. 600 kg per cubic metre is also a bit heavy but I feel Balaena Bay needs some weight in her mast to slow her action in beam seas. Did a rough calculation and should be around 120 kg. I say rough calculation.
At this time a split Junk Rig is appealing, thanks for the advice David.
Last modified: 29 Apr 2013 06:17 | Deleted user