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Re: Stack Strakes

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Thank you, Ray. I will definitely look into that if I proceed with the concept of wire rope strakes. I see other benefits as well: I wouldn't have to check wire rope stiffness in bending to avoid the impacts; I wouldn't have to use clips that clamp the wire, just restrain it from moving out of position; the clips could be much farther apart, hence, many less of them; and maybe more.

If you use impact dampers frequently what sort of damping ratio would you guess would be reasonable?


H. Daryl Richardson

----- Original Message ----- From: "Ray Minor" <ray.minor(--nospam--at)>
To: <seaint-seaosc(--nospam--at)>
Sent: Monday, February 04, 2013 2:12 PM
Subject: RE: [SEAINT-SEAOSC] Stack Strakes

I suggest leaving some slack in the wire ropes to let them bang into the
stack to provide impact dampening.  We use impact type dampeners
extensively on lighting poles.

Ray Minor

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On
Behalf Of Harold Sprague Sent: Friday, February 01, 2013 5:32 PM
To: seaint-seaosc(--nospam--at)
Subject: RE: [SEAINT-SEAOSC] Stack Strakes

I have tried almost anything to avoid helical strakes myself.  All of MY
previous efforts to avoid bar stock helical strakes failed.

If your client is serious, you will have to run 3 ropes in a helical
pattern. I have never tried wire rope, but you will have to anchor it and
support it at intervals to keep it from banging into the stack.  The
potential problem is in the aspect ratio of the wire rope.  To get the
profile required to mitigate vortex shedding will take a pretty big wire

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