Thanks for your input, all very scientific. Having the mast tested
using weights has some logic to it.

The boat is a proa, a multihull. The side says (there is only 1) is 4m
from the mast. Mast is 6m high. Righting moment could be rather high
as I was hoping for 50kg of water ballast in teh outrigger at 4m to
windward. 50L water ballast tank need not be full I guess.

The mast comes from a professional mast/spar maker.

The boat is a proa. Main hull is 23 long, 2 ft wide, boat weigh
unladen is less than 200kg. Not intending to break speed records.

I was hoping to do a comparison with a boat like a Hobie 14 cat. I
wonder what their mast dimsnsions woudl be, cannot recall the mast
section details of the windrush 12 cat that I used to sail, for some
reason never got around to measuring it. Feel that a hobie 14 - 12 has
simialr sail area/righting moment, is stayed out wide as per proa. So
what is good for that would be good for me.

N. Peter Evans