TackleTour

Thanks guys.

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

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

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.

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.

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.

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 .

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 .

It is new to me. Just 1 thing to do...

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.

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!

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: Casting weight velocity / spool revolutions profile (during cast) I assumed something following: 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.)

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???

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

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

I tried acoustic tachometer in smartphone 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.

jvelth74 wrote: ↑

Tue Mar 09, 2021 2:08 am

I tried acoustic tachometer in smartphone 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.