This is technically known as "vortex shedding". It's a natural phenomena
caused by the air flow around a round cylinder ( the rod or the wire) and
occurs at certain wind speeds. At normal speeds, normal flow occurs, and
there's no vibration. At certain higher speeds, vortexes develop, and induce
vibrations in the rigging. Tightening or loosing the rigging will usually
reduce the effect. You can find a more complete description on the internet.
Note: Commercial airliners have observed the problem at their wing tips, and
many recently added small winglets at the ends of their wings. I believe
this reduces energy loss, reduces the vibration, and improves their fuel
mileage.
Don Wagner
C&C 41 CB
Der Baron
West River MD
-----Original Message-----
From: Christian Tirtirau via CnC-List
Sent: Monday, July 25, 2016 11:04 AM
To: cnc-list@cnc-list.com
Cc: Christian Tirtirau
Subject: Stus-List Singing Rigging
Hello fellow seers,
I'm getting this humming in the mast as soon as I have a little breeze while
on the mooring ball and it's really annoying. At first I thought it was a
generator or an engine sound propagated by water but I realized it's the
strings of this big violin that are singing. Any idea how you get rid of
that without messing up the rig balance? Is it the baby stay? I have a lower
that is a little loose and when I tension it the sound pitch changes but
does not go away.
Cheers,
Christian Tirtirau
C&C 37 Northern Light
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_______________________________________________
This list is supported by the generous donations of our members. If you like
what we do, please help us pay for our costs by donating. All Contributions are
greatly appreciated!
