SGS Z tips sink comparison - Spey Pages
 
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post #1 of 3 (permalink) Old 09-20-2019, 06:55 PM Thread Starter
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SGS Z tips sink comparison

Just curious what Z-15 equals in T tips, and likewise Z-19.

Thanks

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at your right hand are pleasures forevermore.

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post #2 of 3 (permalink) Old 09-20-2019, 11:49 PM
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They seem to me to be a bit fatter for a given linear density (weight/length, not to be confused with density, weight/volume), so they will sink slower for a given linear density. Other than that, if Steve hasn’t done it, and you don’t have a tank to do it experimentally, then you can use the equation derived from the fluid mechanics from this paper:

http://www.flyfishingresearch.net/im...lyFisher79.pdf

which is U = 37.5 (S - 1)^0.563 D^0.689

Here U is the sink rate in ips, S is the ratio of the density of the line to that of water, and D the diameter of the line in inches. All you need is a ruler, a scale, a micrometer and a calculator. Works for any level tip, though as a warning the experimentally determined sink rates systematically overestimate the actual sink rate (reasons for this discussed on the site) so get the actual answer to your question as to the sink rates relative to the t-stuff you should apply the formula to the t-stuff as well, and that will give you the relative sink rates. The folks over at FlyFishing research made several tables at the time they did the work (more than a decade ago) pulling all of this together, but I don’t think Steve’s stuff was around then, or in the tables. At any rate if it was might have still have been too obscure for them.

If daunted I assure you this should be no more than a moderately difficult calculation for a smart high school junior that understands geometry and units, so if you have one on your block I bet they will do the job for peanuts - or maybe offer to buy them a six pack.

Edit: Oh, actually there is an online calculator - just remembered - on the site so you probably will just need to do the measurements and enter the numbers there, not the calculation. They thought of almost everything.

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post #3 of 3 (permalink) Old 09-27-2019, 11:11 PM Thread Starter
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Quote:
Originally Posted by Botsari View Post
They seem to me to be a bit fatter for a given linear density (weight/length, not to be confused with density, weight/volume), so they will sink slower for a given linear density. Other than that, if Steve hasnít done it, and you donít have a tank to do it experimentally, then you can use the equation derived from the fluid mechanics from this paper:

http://www.flyfishingresearch.net/im...lyFisher79.pdf

which is U = 37.5 (S - 1)^0.563 D^0.689

Here U is the sink rate in ips, S is the ratio of the density of the line to that of water, and D the diameter of the line in inches. All you need is a ruler, a scale, a micrometer and a calculator. Works for any level tip, though as a warning the experimentally determined sink rates systematically overestimate the actual sink rate (reasons for this discussed on the site) so get the actual answer to your question as to the sink rates relative to the t-stuff you should apply the formula to the t-stuff as well, and that will give you the relative sink rates. The folks over at FlyFishing research made several tables at the time they did the work (more than a decade ago) pulling all of this together, but I donít think Steveís stuff was around then, or in the tables. At any rate if it was might have still have been too obscure for them.

If daunted I assure you this should be no more than a moderately difficult calculation for a smart high school junior that understands geometry and units, so if you have one on your block I bet they will do the job for peanuts - or maybe offer to buy them a six pack.

Edit: Oh, actually there is an online calculator - just remembered - on the site so you probably will just need to do the measurements and enter the numbers there, not the calculation. They thought of almost everything.
Thank you for the response! I appreciate the time Bots

You make known to me the path of life;
in your presence there is fullness of joy;
at your right hand are pleasures forevermore.

PSALM 16:11
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