Lift force acting on a fly line

[Graeme H]

Hi Graeme

I would be very interested in a few (only ) clips of the line shot loop footage.

Regards,
Dirk

No, it's all or nothing Dirk!

Death by tell tail ....

[Paul Arden]

Interesting stuff Graeme. This no doubts helps explain why the old idea that you needed a tight loop to cast into the wind really isn’t actually true. You need a straight fly leg that’s directed towards your target and high line speed. The tightness of the loop is irrelevant as anchoring the tip in the water teaches.

Believe it or not, a bombardment of videos of different casts may actually be useful. I think what has become obvious to you has been reinforced by such a bombardment. It’s like those whip cracking videos. They didn’t just show one whip crack but dozens!

And to be honest it gets quite annoying to see just one cast posted dozens of times to prove lift when it’s a Roll Cast.

Cheers, Paul

[Graeme H]

Yes, "directed at the target" is the important bit Paul, as you no doubt know. I don't actually think it must start out tight (witness the 170 cast) because a loop in a cast with all the line directed correctly becomes tight, whether you want it to or not. It's that vector and how well the velocity is focused at the target that's important.

Okay, I'll post a single video with multiple casts to illustrate the consistency of the patterns.

Cheers,
Graeme

[Dirk le Roux]

I would be very interested in a few (only ) clips of the line shot loop footage.

No, it's all or nothing Dirk!

Death by tell tail ....

Then go for it!

And while you're at it, would it be too much to ask to switch on the velocity vectors in the post #248 snapshot as promised? Thanks!

[Paul Arden]

I’d go further, Graeme, the trajectory of the backcast is key. You can’t throw a low backcast and then a low forward cast; the loop opens. For casting into the wind the backcast must be angled above the horizontal, aligned to the front target.

When I think about casting into a strong wind; you need fast line speed, plus you are casting into a wind. It’s the trajectory and speed of the fly leg that matters. If lift was significant we would have to make some strange compensations to the stroke such as aim at a target closer than intended!

Cheers, Paul

[Graeme H]

For Dirk:

[Dirk le Roux]

Thanks!

[Dirk le Roux]

Sorry Graeme, another favour - could you show the acceleration vectors, please?

[Graeme H]

Acceleration vectors

[Merlin]

If the fly leg is going up, the loop goes up too.

Interesting graphic and reasoning Graeme, I have asked Dirk for some checks on your video. So it would be an inertial effect? Why not, but there is the rod leg to lift somehow. Let's see where the analysis brings us.

Merlin