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Q:
for fly lines, how do you convert grains to wt?
Question by Noah Gates. Uploaded on June 21, 2012
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Answers (12)
not sure if this will answer your question but,,,
15.4 grains is roughly a gram...
28 grams per ounce..
You may be talking about how many grains in a particular wt. flyline that matches the rod. There are charts telling you. I am making a guess, as I forget the chart numbers now. I think a 145-155 grain wt. line, and that is the grain wt. of the last 30 ft. of a tapered flyline, would be a 5 wt. I am close. And it does vary by 10 grains. SO, if you had a line you didn't know the wt . of it, and it was a tapered flyline, you could weigh the last 30 ft. on a grain wt. scale like a bullet scale, and determine the line wt. designated number by looking at the chart for each wt. of line. And spey lines?..they are way up there in grain weights from standard lines....400 grains, and up.
I am sure you can find the conversion chart on Google.
Grains per inch or foot do not necessarily convert accurately to line weight. Every company has some variation in the actual weight of a given line weight. Variations in the density and other properties of the material in the line can affect its performance on the rod. For example, a denser, thinner line may carry more spped and still load a rod well in spite of lower overall weight. Therefore that denser line may have a lower actual weight but the same line weight as another line with less dense material.
jezzant..Some companies designate, I have been told, giving a line a plus rating, meaning at the top of the grain wt. scale for a particular line wt. like a 6 + wt. The way I look at t line speed is in the casting stroke, your stroke, If I double haul agressively, then I put some load in the rod via my stroke. A slow, easy stroke with little, or no haul doesn't bend the rod nearly as much.
4wt = 180 gr
5wt = 210 gr
6wt = 240 gr
7wt = 278 gr
8wt = 315 gr
9wt = 360 gr
10wt = 420 gr
11wt = 495 gr
12wt = 570 gr
Larry...NOT EVEN CLOSE. Where did you come up with those line wts. Get them off the steroids.
Where's this Larry dude that lied about the grain weights?
Line Wt. grains (range) In grams In ounces
1 60 +/- 6 3.888 0.137
2 80 +/- 6 5.184 0.183
3 100 +/- 6 6.48 0.228
4 120 +/- 6 7.78 0.274
5 140 +/- 6 9.07 0.320
6 160 +/- 8 10.42 0.366
7 185 +/- 8 11.99 0.422
8 210 +/- 8 13.61 0.48
9 240 +/- 10 15.55 0.55
10 280 +/- 10 18.14 0.64
11 330 +/- 12 21.38 0.75
12 380 +/- 12 24.62 0.87
13 442 +/- 14 28.64 1.01
14 511 +/- 14 33.12 1.17
15 590 +/- 14 38.24 1.35
(Per 30 feet)
These numbers are per the AFTMA/ASA (American Fishing Tackle Manufacturers Association/American Sportfishing Association). As you can see, the wt line vs mass of line is not a linear correlation. For example the difference between 1 wt line and 2 wt line is 20 grains, but the difference between 14 wt and 15 wt is 79 grains. Hope this helps.
sorry about the numbers being crunched together, that was not the way i entered it in the 'post an answer' field. Go to the rodbuilding forum and search for 'aftma fly line weights' for a clean sheet. I'd give the internet address, but this site blocks it to prevent spammers etc...
Mike...Jus want the truth, and nothin but the truth. And it is the last 30 ft of your flyline that is the wt. in grains. Knowing that you can then determine what distance you put line in the air on the backcast. Say you fish small streams only, and have a 6wt rod, and never put more that 15 ft. of line in the air to load your rod,(flex your rod) on the backcast. I would put at least a 7 wt. line on my rod, and possibly and 8wt. But also realize that a fully flexed rod is a rod that flexes to the max, down to the base of where the action of the rod bends. When you make a short cast you are only flexing the tip of the rod, or in that portion of the rod, and can do it with less grain wt. As you lengthen your casting stroke to cast further, you bend more, and more of the rod. That is why the grain wt. is only a suggested line wt. For the most part, I go with it on all of my rods.
Per Tom Kirkman (publisher of Rod Maker Magazine), "So AFTMA had to arrive at a constant length of line from which to take their weight measurements. They settled on measuring the weight of the first 30 feet of line.
And per Cortland (fly line manufacturer), "The system uses the weight in grains (a very small weight measure) of the first 30 feet of fly line as a standard".
Thanks for your comments though. Perhaps I do not understand your comment re "the last 30 ft of your flyline that is the wt. in grains"?
Post an Answer
4wt = 180 gr
5wt = 210 gr
6wt = 240 gr
7wt = 278 gr
8wt = 315 gr
9wt = 360 gr
10wt = 420 gr
11wt = 495 gr
12wt = 570 gr
Larry...NOT EVEN CLOSE. Where did you come up with those line wts. Get them off the steroids.
Where's this Larry dude that lied about the grain weights?
Line Wt. grains (range) In grams In ounces
1 60 +/- 6 3.888 0.137
2 80 +/- 6 5.184 0.183
3 100 +/- 6 6.48 0.228
4 120 +/- 6 7.78 0.274
5 140 +/- 6 9.07 0.320
6 160 +/- 8 10.42 0.366
7 185 +/- 8 11.99 0.422
8 210 +/- 8 13.61 0.48
9 240 +/- 10 15.55 0.55
10 280 +/- 10 18.14 0.64
11 330 +/- 12 21.38 0.75
12 380 +/- 12 24.62 0.87
13 442 +/- 14 28.64 1.01
14 511 +/- 14 33.12 1.17
15 590 +/- 14 38.24 1.35
(Per 30 feet)
These numbers are per the AFTMA/ASA (American Fishing Tackle Manufacturers Association/American Sportfishing Association). As you can see, the wt line vs mass of line is not a linear correlation. For example the difference between 1 wt line and 2 wt line is 20 grains, but the difference between 14 wt and 15 wt is 79 grains. Hope this helps.
sorry about the numbers being crunched together, that was not the way i entered it in the 'post an answer' field. Go to the rodbuilding forum and search for 'aftma fly line weights' for a clean sheet. I'd give the internet address, but this site blocks it to prevent spammers etc...
Mike...Jus want the truth, and nothin but the truth. And it is the last 30 ft of your flyline that is the wt. in grains. Knowing that you can then determine what distance you put line in the air on the backcast. Say you fish small streams only, and have a 6wt rod, and never put more that 15 ft. of line in the air to load your rod,(flex your rod) on the backcast. I would put at least a 7 wt. line on my rod, and possibly and 8wt. But also realize that a fully flexed rod is a rod that flexes to the max, down to the base of where the action of the rod bends. When you make a short cast you are only flexing the tip of the rod, or in that portion of the rod, and can do it with less grain wt. As you lengthen your casting stroke to cast further, you bend more, and more of the rod. That is why the grain wt. is only a suggested line wt. For the most part, I go with it on all of my rods.
Per Tom Kirkman (publisher of Rod Maker Magazine), "So AFTMA had to arrive at a constant length of line from which to take their weight measurements. They settled on measuring the weight of the first 30 feet of line.
And per Cortland (fly line manufacturer), "The system uses the weight in grains (a very small weight measure) of the first 30 feet of fly line as a standard".
Thanks for your comments though. Perhaps I do not understand your comment re "the last 30 ft of your flyline that is the wt. in grains"?
not sure if this will answer your question but,,,
15.4 grains is roughly a gram...
28 grams per ounce..
You may be talking about how many grains in a particular wt. flyline that matches the rod. There are charts telling you. I am making a guess, as I forget the chart numbers now. I think a 145-155 grain wt. line, and that is the grain wt. of the last 30 ft. of a tapered flyline, would be a 5 wt. I am close. And it does vary by 10 grains. SO, if you had a line you didn't know the wt . of it, and it was a tapered flyline, you could weigh the last 30 ft. on a grain wt. scale like a bullet scale, and determine the line wt. designated number by looking at the chart for each wt. of line. And spey lines?..they are way up there in grain weights from standard lines....400 grains, and up.
I am sure you can find the conversion chart on Google.
Grains per inch or foot do not necessarily convert accurately to line weight. Every company has some variation in the actual weight of a given line weight. Variations in the density and other properties of the material in the line can affect its performance on the rod. For example, a denser, thinner line may carry more spped and still load a rod well in spite of lower overall weight. Therefore that denser line may have a lower actual weight but the same line weight as another line with less dense material.
jezzant..Some companies designate, I have been told, giving a line a plus rating, meaning at the top of the grain wt. scale for a particular line wt. like a 6 + wt. The way I look at t line speed is in the casting stroke, your stroke, If I double haul agressively, then I put some load in the rod via my stroke. A slow, easy stroke with little, or no haul doesn't bend the rod nearly as much.
Post an Answer