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Search found 73 matches

by hshl
Thu Aug 06, 2020 6:01 am
Forum: Flycasting Physics
Topic: Is an easy estimation on efficiency possible ?
Replies: 4
Views: 158

Re: Is an easy estimation on efficiency possible ?

Let’s be practical Absolutely Merlin, in terms of the same input energy (~rotational energy) I see two possibilities for both rods to compare: a) The rigid rod has the same length as the undeflected flexible rod. In this case I expect a lower angular velocity for the rigid rod. b) The rigid fly rod...
by hshl
Wed Aug 05, 2020 8:46 am
Forum: Flycasting Physics
Topic: Is an easy estimation on efficiency possible ?
Replies: 4
Views: 158

Re: Is an easy estimation on efficiency possible ?

Hi Merlin, I think there is an unique definition of efficiency, even if we look on the different subtopics according to Wikipedia : efficiency is determined as the ratio of the output and input, but why not using the definition of the mechanical efficiency subtopic . Quote: “Mechanical efficiency is...
by hshl
Tue Aug 04, 2020 8:21 am
Forum: Flycasting Physics
Topic: Is an easy estimation on efficiency possible ?
Replies: 4
Views: 158

Is an easy estimation on efficiency possible ?

Hi all together, Sometimes I read a comment like this: „As I’m able to cast further with an (almost) rigid fly rod, this one must be more efficient than a more flexible one”. So my impression is, that a lot of people are still focussing on the casting length only to make a statement on efficiency. T...
by hshl
Mon May 11, 2020 9:15 am
Forum: Flycasting Physics
Topic: Square snaps
Replies: 37
Views: 2136

Re: Square snaps

Hi Dirk,
interesting stuff - I just wonder about the practical benefit ? :blush:
Cheers,
by hshl
Tue Feb 04, 2020 7:57 am
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 52
Views: 5917

Re: The Whip Effect

By which mechanism can some kinetic energy of a (stiff) rod can be transmitted to a soft line? Wave on a string? Impedance would be a problem I guess. I don't know Merlin, my investigantions end up estimating the tip speed and with it the whip analogy too. As far as I know (from you) it is a very d...
by hshl
Mon Feb 03, 2020 7:44 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 52
Views: 5917

Re: The Whip Effect

Gordy, Which video are you referring to? Of course to the video Paul refers to COAM seems to be a central tenet in a number of your videos on Vimeo. Yes, in my older videos I did. Didn't you read annex 3 of my investigations? So I don't know in which direction your statement should drive us ?! In An...
by hshl
Mon Feb 03, 2020 6:37 am
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 52
Views: 5917

Re: The Whip Effect

In Annex 3 of my investigations Franz-Josef gave further explanations. To avoid misunderstandings we rather use the term 'redistribution' instead of 'COAM' . In my video 'COAM' is not used at all.
by hshl
Sun Feb 02, 2020 10:26 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 52
Views: 5917

Re: The Whip Effect

Gordy, Thus since the rod is flexible, different sections of the rod will have different angular velocities and more importantly different rotation centers so I don't see how you would compute an composite angular momentum value for its moving mass since that assumes all of the mass in the body has ...
by hshl
Sun Feb 02, 2020 8:15 am
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 52
Views: 5917

Re: The Whip Effect

Hi Merlin, Like others I struggle with the outcome, that the whip effect should be higher for a heavier tip section. For a whip I expect it would become a club putting a weight on the end of it. To me for the whip effect it is important that the angular momemtum, which is first distributes along the...
by hshl
Fri Jan 31, 2020 10:14 pm
Forum: Flycasting Physics
Topic: The Whip Effect
Replies: 52
Views: 5917

Re: The Whip Effect

Hi Merlin, reading your post #11 I got some questions: on your figure of post #11 the whip effect is much less than 10 %, isn't it ? How does it match with your post: https://www.sexyloops.co.uk/theboard/viewtopic.php?f=8&t=3062&start=10 on which for a modern SH fly rod you calculate a 'pure whip' e...

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