PLEASE NOTE: In order to post on the Board you need to have registered. To register please email paul@sexyloops.com including your real name and username. Registration takes less than 24hrs, unless Paul is fishing deep in the jungle!

Contribution rod bend/spring makes to cast

Moderator: Torsten

User avatar
Lasse Karlsson
Posts: 5780
Joined: Wed Jan 09, 2013 9:40 pm
Answers: 0
Location: There, and back again
Contact:

Contribution rod bend/spring makes to cast

#11

Post by Lasse Karlsson »

Paul, because the rod bends we can hit it harder, but where does the energy for the counterflex come from? I suspect the lever effect is much larger, and the spring mostly goes into wobbling, then again I do not sell those things, and largely the only ones interested in talking them up do ;)

Cheers
Lasse
Your friendly neighbourhood flyslinger

Flycasting, so simple that instructors need to make it complicated since 1685

Got a Q++ at casting school, wearing shorts ;)
Stoatstail50
Posts: 1485
Joined: Wed Jan 16, 2013 8:57 am
Answers: 0

Contribution rod bend/spring makes to cast

#12

Post by Stoatstail50 »

Talking of which when are you coming to visit?
Dunno man...it's not in the book at the moment but you never know... :)
Casting Definitions

Many men go fishing all of their lives without knowing that it is not fish they are after.
User avatar
Paul Arden
Site Admin
Posts: 19579
Joined: Thu Jan 03, 2013 11:20 am
Answers: 2
Location: Belum Rainforest
Contact:

Contribution rod bend/spring makes to cast

#13

Post by Paul Arden »

Hi Lasse,

Well that's just excellent that you "suspect" that but I was really looking for facts :p

Cheers, Paul
It's an exploration; bring a flyrod.

Flycasting Definitions
Stoatstail50
Posts: 1485
Joined: Wed Jan 16, 2013 8:57 am
Answers: 0

Contribution rod bend/spring makes to cast

#14

Post by Stoatstail50 »

These are the "facts" as I know them.

1. The only energy source in the system is the caster.

2. You cant get more out than you put in.

That's it... :)
Casting Definitions

Many men go fishing all of their lives without knowing that it is not fish they are after.
User avatar
Merlin
Posts: 2106
Joined: Wed Jan 09, 2013 8:12 pm
Answers: 0
Location: France

Contribution rod bend/spring makes to cast

#15

Post by Merlin »

where does the energy for the counterflex come from?
It comes from the remaining kinetic energy of the rod, which is concentrated in the tip at RSP.

Merlin
Fly rods are like women, they won't play if they're maltreated
Charles Ritz, A Flyfisher's Life
User avatar
Paul Arden
Site Admin
Posts: 19579
Joined: Thu Jan 03, 2013 11:20 am
Answers: 2
Location: Belum Rainforest
Contact:

Contribution rod bend/spring makes to cast

#16

Post by Paul Arden »

Hi Mark,

Right but you can put more in with a bendy rod compared to a rigid one?

Well it should be! When I get more organised I'll be sending you an invite - that's the plan :cool:

Cheers, Paul
It's an exploration; bring a flyrod.

Flycasting Definitions
User avatar
VGB
Posts: 6140
Joined: Thu Jan 10, 2013 12:04 pm
Answers: 0

Contribution rod bend/spring makes to cast

#17

Post by VGB »

Fuck, is it the close season already?
“Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius — and a lot of courage — to move in the opposite direction.” — Ernst F. Schumacher

https://www.sexyloops.com/index.php/ps/ ... f-coaching
User avatar
Merlin
Posts: 2106
Joined: Wed Jan 09, 2013 8:12 pm
Answers: 0
Location: France

Contribution rod bend/spring makes to cast

#18

Post by Merlin »

Paul

Assuming you can get a rather straight path with a broosmstick, most of your energy is used to rotate the broomstick to give speed to the line. You have to use the same amount of kinetic energy to stop the rod, which is awfully tiring. The only force on the line is due to the acceleration of the tip which you get from leverage.

On top of allowing a more convenient hand path to get a correct path for the tip, you can feed more energy to a rod (elastic, inertial) thanks to its flexibility. At the end you can recover the elastic energy which is temporary stored and a part of the kinetic energy of the rod. Instead of having to cancel the kinetic energy of a full broomstick for which every piece of mass counts, you benefit from a self deceleration of the butt and a kinetic energy to spoil which is limited to the tip of the rod. The higher the level of energy you can put into the spring, the higher the level of energy given to the line. The working force is due to the spring, not to the simple acceleration of the tip linked to rotation (broomstick case). The amount of inertial effect is due to the distribution of mass along the rod shaft (and to the distribution of stiffness to a lesser degree). It is design and material dependant. If you want to maximize the inertial effect, you should opt for a butt action, but you could lose in spring benefit (too soft and/or slow). Modern rods are “spring oriented”.

Merlin
Fly rods are like women, they won't play if they're maltreated
Charles Ritz, A Flyfisher's Life
Stoatstail50
Posts: 1485
Joined: Wed Jan 16, 2013 8:57 am
Answers: 0

Contribution rod bend/spring makes to cast

#19

Post by Stoatstail50 »

Right but you can put more in with a bendy rod compared to a rigid one?
I think, to summarise Merlin, that It's easier, yes.
Casting Definitions

Many men go fishing all of their lives without knowing that it is not fish they are after.
User avatar
Lasse Karlsson
Posts: 5780
Joined: Wed Jan 09, 2013 9:40 pm
Answers: 0
Location: There, and back again
Contact:

Contribution rod bend/spring makes to cast

#20

Post by Lasse Karlsson »

Paul Arden wrote:Hi Lasse,

Well that's just excellent that you "suspect" that but I was really looking for facts :p

Cheers, Paul
Feck mate, I learned that from you :p

Why do you choose stiffer and stiffer rods for distance? A bendier one lets you hit it so much harder???

Btw. I agree with Mark here

Cheers
Lasse
Your friendly neighbourhood flyslinger

Flycasting, so simple that instructors need to make it complicated since 1685

Got a Q++ at casting school, wearing shorts ;)
Post Reply

Return to “Flycasting Physics”