Forum: SparTalk
09-21-2015, 01:59 PM
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Replies: 22
Views: 15,528
Brion,
This is some feedback on my failed...
Brion,
This is some feedback on my failed (<100%) button knot attempts. I didn't understand the importance of setting the knot carefully. I pulled it as tight as I could by hand, thinking that it...
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Forum: SparTalk
04-11-2015, 10:09 AM
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Replies: 7
Views: 4,852
Hybrid deadeye winch shroud adjustor
The out of box thinking here, at least for me, is splicing a dumb sheave onto a shroud to gain mechanical advantage. So let's invent some shroud fittings to take advantage of this.
The upper...
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Forum: SparTalk
04-08-2015, 05:31 PM
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Replies: 22
Views: 15,528
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Forum: SparTalk
03-21-2015, 09:48 AM
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Replies: 22
Views: 15,528
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Forum: SparTalk
02-23-2015, 06:16 AM
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Replies: 5
Views: 2,995
Roll amplitude
Gleb,
I think you are talking about roll amplitude, not roll period. So what I posted before doesn't apply much.
Roll amplitude seems to be a complicated mix of static stability, damping, wave...
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Forum: SparTalk
02-22-2015, 12:34 PM
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Replies: 5
Views: 2,995
C. A. Marchaj formula
I found this iin 'Seaworthiness The Forgotten Factor' by C. A. Marchaj. (Equation 20A, page 128).
Tn=6.3(SQRT(Ir/(GM*displacement)))
Tn is the natural period of rolling
Ir is the mass moment of...
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