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Stiffness and Tip speed

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Lasse Karlsson
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Stiffness and Tip speed

#51

Post by Lasse Karlsson » Sun Jan 20, 2019 8:21 am

Merlin wrote:
Any volunteer? :)

Merlin
Have you asked Ulrik? I think he might already have even better data than just two cameras on this....

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Lasse
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Merlin
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Stiffness and Tip speed

#52

Post by Merlin » Sun Jan 20, 2019 8:57 am

Hi Graeme

Data in post #13 have nothing to do with TLT. The « casts » use an input similar to one of Paul’s 170 competition cast.

Merlin
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Stiffness and Tip speed

#53

Post by Merlin » Sun Jan 20, 2019 9:00 am

Hi Vince

Ths quoted speeds correspond to the maximum tip speed obtained with the same input (and include a strong haul), they occur some 25 ms to 40 ms before RSP, as can be expected.

Merlin
Fly rods are like women, they won't play if they're maltreated
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Stiffness and Tip speed

#54

Post by Merlin » Sun Jan 20, 2019 9:04 am

Hi Lasse

I sent the same documents to Ulrik some 18 months ago but he did not propose some records, maybe just because the information required for a comparison did not exist.

Merlin
Fly rods are like women, they won't play if they're maltreated
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Stiffness and Tip speed

#55

Post by guest » Sun Jan 20, 2019 10:14 am

Hi Daniel

Ulrik discusses line and tip measurements as a later development, so it appears that he doesn’t have any data. Has the rod tip come off the SLP at 25-40 mS before RSP?

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Vince
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Merlin
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Stiffness and Tip speed

#56

Post by Merlin » Sun Jan 20, 2019 12:20 pm

Hi Vince

Here is the same illustration when using the tip speed at the time when the vertical tip speed peaks. That should correspond to your question I think:
tip speed shootout 2.JPG
tip speed shootout 2.JPG (35.33 KiB) Viewed 1011 times
As you can see there is a downwards shift in values, but the general pattern remains the same.

Merlin
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Stiffness and Tip speed

#57

Post by Lasse Karlsson » Sun Jan 20, 2019 12:37 pm

Merlin wrote:Hi Lasse

I sent the same documents to Ulrik some 18 months ago but he did not propose some records, maybe just because the information required for a comparison did not exist.

Merlin

Considering the hint of experimentation he has done in the last 12 months, I would not say that with certainty.

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Stiffness and Tip speed

#58

Post by Merlin » Sun Jan 20, 2019 12:59 pm

Thanks for the info Lasse, I shall contact Ulrik again.

Merlin
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Stiffness and Tip speed

#59

Post by guest » Sun Jan 20, 2019 2:37 pm

Merlin wrote: Here is the same illustration when using the tip speed at the time when the vertical tip speed peaks. That should correspond to your question I think:
Hi Daniel

Thank you but I was looking at where the tip deviates from the SLP, so I guess it would be where the vertical speed changes from zero.

Regards

Vince
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Stiffness and Tip speed

#60

Post by Merlin » Sun Jan 20, 2019 2:43 pm

Aging is no good, you know Vince.

The graphic corresponds to the zero point in vertical tip speed, the peak takes place earlier.

I don’t know why I said that stupid thing, maybe because I looked too much at the speed histories.

Merlin
Fly rods are like women, they won't play if they're maltreated
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