Jami

In countries like Norway, Sweden and Finland, it should be easy to find a straight spruce tree for a mast.

Now I looked up the *The Cambered Panel Junk Rig*, Chapter six to find the needed diameter of a hollow wooden mast. First, I found the fake sale area to give a SA/disp =14:

Fake SA =18.38sqm.

Putting this and a LAP=8.3m into the PJR formula produced a resulting mast diametre

D=19.8cm.

Even by twisting the PJR formula, the masts come out on the heavy side.

Another method:

I also have another ‘home-made’ formula based one the estimated righting moment of the boat and the bending strength of a (hollow) wooden pole. Since wood varies in strength, I have put in a needed breaking strength 3 times the estimated righting moment of the boat.

The result was D=17.36cm, or say 18cm.

I know that *Jester* used a mast, which was about 18.2cm. This was much taller than this one and Jester was also heavier than the Gallion 22, so maybe a diameters of 17cm would be a better choice for the coastal waters around Finland. I surely would reckon 18cm to be plenty, even if you have the North Sea in mind.

Arne

PS: I haven’t double-checked my calculations.