Chuck,
Full disclosure: I work for a rope company, Novabraid.  3/8" halyards with a 
blended UHMWPE core will be plenty strong enough.  No question.  And Samson MLX 
is an awesome product and very similar in design to our Argus rope (although we 
use Spectra rather than Dyneema in the core blend).
The key ingredient is stretch and elongation.  After getting the initial creep 
out of the rope doing some pre- tensioning, 3/8" MLX rope will be lighter aloft 
and easier to handle.And will your rope clutches grip a 3/8" rope if you are 
replacing a 7/16" rope/wire halyard?  What about your masthead sheaves?  Check 
for wear and burrs on the sheaves (from years of wear from wire) before you 
reeve a new halyard and destroy the cover on the first sail.  My 35LF has 3/8" 
Argus halyards and they're perfectly strong and stretch resistant.
Let us know how you like the new halyards!
Chuck Gilchrest 
S/V Half Magic
1983 35 Landfall
Padanaram, MA

Sent from my iPhone

> On Jan 24, 2017, at 4:53 PM, Chuck Saur via CnC-List <cnc-list@cnc-list.com> 
> wrote:
> 
> Greetings...just 14 weeks till launch 2017!  I could not find listers' 
> advice/experience about changing SIZE of halyard line from current wire/rope 
> to  Dyneema blend (looking at 3/8 Samson MLX).  The halyard sheaves appear to 
> have enough width to handle 3/8 line; and understand the sheaves need to be 
> smooth to avoid chafe, which they appear to be.  
> 
> Seems 3/8 MLX would have enough load capacity for each of the 3 halyards on 
> my 35-3.  Or...is there guidance to go up to a 7/16?  
> 
> Anyone with opinion?
> 
> 
> Chuck Saur
> 
> (517)-490-5926
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