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

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

Post by mark poulson » Sun Feb 28, 2021 10:52 am

Thanks guys.

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

Post by SSS » Wed Mar 03, 2021 11:21 am

I bought these for my pixy. The quality is on par with what Hedgehog makes. Really impressed.

https://www.aliexpress.com/item/4001287 ... 2e038g0ZmK

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

Post by Carlos Carrapiço » Thu Mar 04, 2021 3:10 am

amso4 wrote:
Sun Feb 28, 2021 5:19 am
I roughed out some back of the napkins calcs and for a 50yd cast it would spin a spool (30mm diam) about 2100 revs. So if a cast took 3 sec, the that would be 700 rev/sec or about 42K rpm.
I think your results might be wrong by a Pi factor:
Perimeter = Pi * Diameter
The average spool speed during the casting if I remember correctly is around 10k rpm and peaking at 30k rpm.

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

Post by amso4 » Thu Mar 04, 2021 7:43 am

Thanks Carlos Carrapiço,

I fat fingered a 13 instead of a 3 converting ft to yds. I fixed the original post. Now it shows 9800 rpm for the example.

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

Post by jvelth74 » Thu Mar 04, 2021 8:23 am

This is absolutely not accurate, I’m just doing brain exercise.

In here I’m casting ~23 m.
https://www.youtube.com/watch?v=ZHVpq00gu8U&t=46s
Cast time ~2,5 s.
That’s 9,2 m/s.
30 mm spool perimeter is 0,09428 m.
That makes 97,6 rps, which is 5857 rpm.
But actually cast starts from ~4,2 m higher than it lands. And arc length of 23 m cast is something 31 m.
So line length is 1,35 x more. => Spool rpm is something 7894 rpm.
But rpm in the end is near to 0. => So rpm in the begin is much higher, something 10’000 – 13’000 rpm.
line length.JPG
line length.JPG (17.91 KiB) Viewed 3767 times

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

Post by Loafer » Sat Mar 06, 2021 11:51 am

Hello, Friends!
Is it new for 2021 Rays Studio spool for Steez: http://alii.pub/5lwknj ?
34 mm BFS spool with 4 position FIXED inductor :shock:.
Image

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

Post by Dalleinf » Sat Mar 06, 2021 12:36 pm

Loafer wrote:
Sat Mar 06, 2021 11:51 am
Hello, Friends!
Is it new for 2021 Rays Studio spool for Steez: http://alii.pub/5lwknj ?
34 mm BFS spool with 4 position FIXED inductor :shock:.
Image
It is new to me. Just 1 thing to do...

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

Post by Carlos Carrapiço » Sat Mar 06, 2021 2:05 pm

jvelth74 wrote:
Thu Mar 04, 2021 8:23 am
This is absolutely not accurate, I’m just doing brain exercise.

In here I’m casting ~23 m.
https://www.youtube.com/watch?v=ZHVpq00gu8U&t=46s
Cast time ~2,5 s.
That’s 9,2 m/s.
30 mm spool perimeter is 0,09428 m.
That makes 97,6 rps, which is 5857 rpm.
But actually cast starts from ~4,2 m higher than it lands. And arc length of 23 m cast is something 31 m.
So line length is 1,35 x more. => Spool rpm is something 7894 rpm.
But rpm in the end is near to 0. => So rpm in the begin is much higher, something 10’000 – 13’000 rpm.

line length.JPG
The RPM will be max in the beginning of the cast and then it will always diminish.
You assume a linear loss of speed but in reality and considering aerodynamic drag, the dependence is quadratic and therefore the spool speed drops very steeply until it gets to a slower speed.

What I’m saying is that you are underestimating the max rpm.
In a normal cast one might reach easily >20k rpm.
When casting for distance with a good reel, you’ll get up to 30k rpm.

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

Post by mark poulson » Sat Mar 06, 2021 4:22 pm

Carlos Carrapiço wrote:
Sat Mar 06, 2021 2:05 pm
jvelth74 wrote:
Thu Mar 04, 2021 8:23 am
This is absolutely not accurate, I’m just doing brain exercise.

In here I’m casting ~23 m.
https://www.youtube.com/watch?v=ZHVpq00gu8U&t=46s
Cast time ~2,5 s.
That’s 9,2 m/s.
30 mm spool perimeter is 0,09428 m.
That makes 97,6 rps, which is 5857 rpm.
But actually cast starts from ~4,2 m higher than it lands. And arc length of 23 m cast is something 31 m.
So line length is 1,35 x more. => Spool rpm is something 7894 rpm.
But rpm in the end is near to 0. => So rpm in the begin is much higher, something 10’000 – 13’000 rpm.

line length.JPG
The RPM will be max in the beginning of the cast and then it will always diminish.
You assume a linear loss of speed but in reality and considering aerodynamic drag, the dependence is quadratic and therefore the spool speed drops very steeply until it gets to a slower speed.

What I’m saying is that you are underestimating the max rpm.
In a normal cast one might reach easily >20k rpm.
When casting for distance with a good reel, you’ll get up to 30k rpm.
Wow!

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

Post by jvelth74 » Mon Mar 08, 2021 11:12 am

Another one estimation. Here I'm casting:
https://www.youtube.com/watch?v=OA5bRF_K0Oo&t=30s
I think it's 100 m or more. Air time is 5,2 seconds.

I Imaginated arc as following. Arc length is 122 m:
Arc length.JPG
Arc length.JPG (15.01 KiB) Viewed 3667 times
Casting weight velocity / spool revolutions profile (during cast) I assumed something following:
Velocity profile.JPG
Velocity profile.JPG (14.35 KiB) Viewed 3667 times
End velocity I assumed as 41% of starting velocity. To the end spool accelerates slightly because weight is descending. It can be heard by spool noise.

Making some area calculation / approximation: starting velocity is something around 46 m/s.
36 mm spool perimeter is 0,0113 m.
This makes starting RPM 24'300.

But, there is much assumed. So I'm not saying this it actually is. It's just one approximation. (30 k RPM is possible.)

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

Post by QUAKEnSHAKE » Mon Mar 08, 2021 6:52 pm

Carlos Carrapiço wrote:
Sat Mar 06, 2021 2:05 pm
jvelth74 wrote:
Thu Mar 04, 2021 8:23 am
This is absolutely not accurate, I’m just doing brain exercise.

In here I’m casting ~23 m.
https://www.youtube.com/watch?v=ZHVpq00gu8U&t=46s
Cast time ~2,5 s.
That’s 9,2 m/s.
30 mm spool perimeter is 0,09428 m.
That makes 97,6 rps, which is 5857 rpm.
But actually cast starts from ~4,2 m higher than it lands. And arc length of 23 m cast is something 31 m.
So line length is 1,35 x more. => Spool rpm is something 7894 rpm.
But rpm in the end is near to 0. => So rpm in the begin is much higher, something 10’000 – 13’000 rpm.

line length.JPG
The RPM will be max in the beginning of the cast and then it will always diminish.
You assume a linear loss of speed but in reality and considering aerodynamic drag, the dependence is quadratic and therefore the spool speed drops very steeply until it gets to a slower speed.

What I’m saying is that you are underestimating the max rpm.
In a normal cast one might reach easily >20k rpm.
When casting for distance with a good reel, you’ll get up to 30k rpm.
For what duration. 1/4 sec 1/2 sec???

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

Post by y2k88 » Tue Mar 09, 2021 1:47 am

30000 rpm, so 500 revs per second.
Who's got a high end slow mo camera? :lol:
Think Samsung S20 in super slow mo can do 960 fps.

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

Post by Dalleinf » Tue Mar 09, 2021 2:07 am

Guys, the RPM discussion is very interesting. Perhaps it deserves a Topic of its own :-k as the DIY Spool thread is difficult enough to navigate as it is. :D

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

Post by jvelth74 » Tue Mar 09, 2021 2:08 am

I tried acoustic tachometer in smartphone :D Didn't success :(

I was looking that GoPro 5 Black can take 240 fps @ 1280x720. That doesn't help either I think.

Sad but Daiwa don't make videocameras. Their Hyper Digi camera would suit perfectly for this need. :D

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

Post by Gone Phishin » Tue Mar 09, 2021 9:58 am

jvelth74 wrote:
Tue Mar 09, 2021 2:08 am
I tried acoustic tachometer in smartphone :D Didn't success :(

I was looking that GoPro 5 Black can take 240 fps @ 1280x720. That doesn't help either I think.

Sad but Daiwa don't make videocameras. Their Hyper Digi camera would suit perfectly for this need. :D

:lol: =D>

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