Anyone tried DIY spools? $29-$40 BFS spools!

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LowRange
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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by LowRange » Mon Apr 22, 2019 1:33 pm

New 5.6 gram fixed inductor BFS spools for the Tatula CT and new 100. The shafts might be aluminum instead of stainless with that low weight. I would think a stainless shaft would take the spool into the 8 gram range. As long as it is used for UL this should not be a problem. My BM3 UL spool has an aluminum shaft and has been great.

One of these spools and a Tatula 100 could make for an affordable UL casting reel.
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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by hoohoorjoo » Mon Apr 22, 2019 7:22 pm

Look closely, that's with no bearing. Its gonna be in the 7.5-8.5 gram range with the bearing added.
Try not to let your mind wander. It is much too small to be outside unsupervised.

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by y2k88 » Mon Apr 22, 2019 7:46 pm

Still, compared with the other Tat CV/SV DIY spools that are 10-11 g without bearing, half the weight is pretty significant.

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by LowRange » Mon Apr 22, 2019 8:45 pm

My Momo BM3 spool with a Ray's DIY micro bearing weighs in at 7.4 grams with an aluminum spool shaft. 5.6 grams without a bearing is still very light weight.

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by y2k88 » Mon Apr 22, 2019 9:06 pm

It would be good if they can report the rotational inertia to provide an indication of start up inertia. Given all of these are 3D designed, i'm sure it would be a pretty simple calc from the model.

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by jvelth74 » Tue Apr 23, 2019 4:04 am

^ Yeh, that's true. Shaft has virtually zero effect to inertia.

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by DirtyD64 » Tue Apr 23, 2019 4:37 am

Interesting, but spool inertia could be affected by mass/weight distribution. I wonder if theoretically a spool with a 5 gram spool and 1 gram shaft would act much differently than the opposite, a spool with only a 1 gram spool construction and a 5 gram shaft. For most real world applications, I am sure the spool shafts are light enough to hardly affect anything, even on heavier duty reels.

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by jvelth74 » Tue Apr 23, 2019 8:47 am

Because Inertia is proportional as D^2, and Dshaft is aprox 5/34 of Dspool => Shaft mass should be huge that it would have any effect to spool inertia.
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(5/34)^2 = 25/1156 = 0.02.

=> It's simple way for custom spool manufacturer's to make spool look good just to lighten the shaft. But what really matters is how much there's aluminium in spool outer circle. And if talking BFS spools, also line weight has significant effect to inertia. For example in Ray's spool for Steez with 0.12 mm Spiderwire; it was 13.2 g. It should weight 10.3 g without line. And line is only in outer circle. Full spool inertia is added maybe by +50% corresponding to empty spool inertia.
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=> If BFS in mind, spool only that amount of line that is necessary.

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by y2k88 » Wed Apr 24, 2019 2:38 am

Well... curiosity got the better of me.

Did a quick calc of the DIY fixed inductor steez spool, for the case with and without line.
The calc is close enough, assumed thicknesses and densities round out to about the measured spool weight.

The line on that spool (~1016 capacity) would account for 67% of the start up inertia (under zero breaks/friction condition).
Or to look at it another way, the line about triples the inertia of an empty spool.
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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by DirtyD64 » Wed Apr 24, 2019 5:01 pm

So imagine 2 spools, same weight, just theoretically say 12grams. One is ported to the max and holds only 50 yards of 10lb braid. The other spool is ported enough to match the same weight, but is more in "deep" spool design (could hold +100 yards), but has the EXACT same amount of line (50 yards of 10lb braid).

So basically these 2 theoretical spools weigh identical and hold the exact same amount of line, just one has the line way out on the edge and the other is much closer to the spool shaft... I assume from the basic physics alone that the shallower spool with line further out will obviously cast better. Right?

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by jvelth74 » Wed Apr 24, 2019 11:30 pm

That’s correct in general. Exeption would be in case that lure is so light vs. spool that can’t be casted hard and spool revolutions are too low for brake to work correctly. In this case spool revolutions are higher in same lure speed and shallow spool can be better. Also that smaller diameter line stack spiral has less inertia, and that can help spool to start with light lures. In other cases, if spool revolutions enough to brake work correctly then shallow spool is better.

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by Bronzeye » Thu Apr 25, 2019 3:09 am

jvelth, I'm not understanding your reply. You begin by agreeing that in general, a shallower spool with the same filled total weight will cast better. Then, in the next sentence, you say there is an exceptional case. In the third sentence, you say, "In this case...shallow spool can be better." Do the words "this case" not refer back exceptional case described by the prior sentence?

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by jvelth74 » Thu Apr 25, 2019 7:42 am

Sorry, it’s probably my English which is not so good. I’m training my English same time that I read this forum / write here :-)

I mean that shallower spool will cast better in most uses. Because in most uses it’s better combination. Inertia is not too big and diameter of line stack is not too low and revolutions of spool is not too high.

Deep spool even with same weight and amount of line as shallow spool can be better in case of casting light weight lure, which is a little too less for spool. Because in this combination starting inertia can be slightly lower and in similar cast spool turns faster in same speed of lure and because of that brakes are working better.

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by Bronzeye » Thu Apr 25, 2019 12:58 pm

I understand that explanation. Thank you!

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Re: Anyone tried DIY spools? $29-$40 BFS spools!

Post by y2k88 » Thu Apr 25, 2019 2:01 pm

Where it gets complicated is a small arbour spool will need to spin faster, so more bearing and line guide friction....

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