Winter standing rigging maintenance

[Don S/V ILLusion]

I recall using a similar chart to calculate actual net shrinkage (different than the Seinfeld connotation) years ago when we lived up north and it was around 2 inches on a 60 ft mast (the diagonal length). That is, the shroud was effectively 2 inches longer than when ambient temperature was above 70degrees F.

There was no way I was going to introduce more and risk constant movement.

 

[DayDreamer41]

What unit is the change in length in?

-Will (Dragonfly)

Units=inches

 

[DayDreamer41]

I recall using a similar chart to calculate actual net shrinkage (different than the Seinfeld connotation) years ago when we lived up north and it was around 2 inches on a 60 ft mast (the diagonal length). That is, the shroud was effectively 2 inches longer than when ambient temperature was above 70degrees F.

There was no way I was going to introduce more and risk constant movement.

I did not use a chart I looked up the coefficient of expansion for the materials listed coefficient * 10^-6 * Delta T to arrive at differential length, I added 5' to the longest shroud which is actually wat too much for the tangental length.

 

[DayDreamer41]

I did not use a chart I looked up the coefficient of expansion for the materials listed coefficient * 10^-6 * Delta T to arrive at differential length, I added 5' to the longest shroud which is actually way too much for the tangental length.There is no way a 60' mast or SS shrouds would shrink 2" at 50* Delta T.

 

[Don S/V ILLusion]

I didn't explain it clearly -it was the net change to which I referred, I.e., the shrouds were the equivalent on 2 inches shorter.