Ericson 38 intermediate shrouds

[Nimue]

Hello,

I'm starting my research into replacing the rigging on my 1982 Ericson 38. I have the original specs regarding shroud and stay wire sizes but am puzzled by information in my copy of The Riggers Apprentice. The E38 is a double spreader rig with a Kenyon 5280 spar and double lowers so I'm using the 30 percent load upper, 30 intermediate and 25 lower model shown in the book. I've used my USYRU performance package information to calculate load values at RM30 and all the original Ericson specs work except for the intermediate shroud size. The E38 specs have the uppers as 9/32 1x9 which should give me a large margin of safety but the intermediates that Ericson recommends are only 7/32. If I use the 30, 30, 25 model shouldn't the intermediates also be 9/32 ?

Also, I would like to ask if, when calculating the RA and RM, if I should be using the displacement as specified by Ericson or use the actual weight of the boat as per travel lift haulout. There is about 5000 plus pounds difference with, of course, the travel lift weighing all the spare parts, tools, gear, tankage and extras that we all seem to accumulate aboard over time.

On another note, I want to thank you Brion for all the great information relayed to us at the Ericson Rendezvous group at Port Hudson last June.

Cheers.
C.A. Fields