If I am going to build a boat, it will be this one.

 I asked Chris Morejohn to design this boat for me and with the help of Arne we got the rig looking good.  imo...

some numbers  

LOA 34 ft

Beam 10 ft

Lwl ca 34 ft

Draft 20 “ board up  6 ft  board down  

Displ 6-8 tons

Main 56 kvm  

Mizzen 9 kvm

CE calculated without mizzen

CLR with rudder and  daggerboard down (small daggerboards aft not included)

lead ca  15 %

chord/wl ca  55%

mast height ca  13 m, ca  11,5 m above partners

max rightning moment  ca 3400 kpm

FoS 3... preferred mast break/bend strength ca  10000kpm

Now.. the mast..... 

When I use the tables in “practical junk rig”, we’re looking at a mast with a breaking strength of 19000 kpm hollow Douglas mast. Diameter 31 cm at partners. Hard and probably very expensive to make..

I would prefer a aluminium mast and have been looking long and hard at the Nedal pole as used on various other vessels

When calculating the strength of this alu mast (220 mm/5 mm Nedal) on a vessel like Tystie I find the bending strength to be quite low. Approx 3100 kpm.... barely the same as the max rm for a boat like Tystie.. or for the HFJY34 for that matter

Are my calculations way off?