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Upward Force from Form Drag

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Graeme H
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Upward Force from Form Drag

#741

Post by Graeme H » Mon Apr 23, 2018 11:01 pm

That image in Vince's post shows that the skin drag is acting on both legs in the string shooter. These is as much drag on the upper leg as there is on the lower leg. How can that arrangement of forces produce net lift for the line? Look at the vectors in play.

Are those who say there is lift produced in this arrangement completely ignoring the upper leg shown here?

In a standard cast, the fly leg is travelling across the ground and the rod leg is stationary. As Gordy correctly noted, drag opposes motion. Skin drag acts to slow the travelling fly leg and does not exist in any meaningful amount in the rod leg.

Cheers,
Graeme
FFi CCI

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Paul Arden
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Upward Force from Form Drag

#742

Post by Paul Arden » Wed Apr 25, 2018 1:02 am

The string blower is interesting. Now what would happen if one end was tethered instread of being accelerated back through the motor? :)

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

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guest
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Upward Force from Form Drag

#743

Post by guest » Thu Apr 26, 2018 6:29 pm

The string would fall on the table and the motor would spin around like a washing machine :upside:
Bright but shite

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Walter
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Upward Force from Form Drag

#744

Post by Walter » Sun Apr 29, 2018 4:54 pm

Paul Arden wrote:The string blower is interesting. Now what would happen if one end was tethered instread of being accelerated back through the motor? :)

Cheers Paul
I think this is a unique and novel idea Paul. If there were more questions and discussions of this nature in the tech analysis section it would actually be interesting to join in. I think that, based on a number of factors, the line will form a loop just like a flycast. How far the loop will propagate will depend on the same factors that allow it to form in the first place. Trying to cast 5 lb mono at 2 mph, for example, isn’t going to do much.

Going to see if I can make one to try it out.

Cheers

Walter
"There can be only one." - The Highlander. :pirate:

PS. I have a flying tank. Your argument is irrelevant.

PSS. How to generate a climbing loop through control of the casting stroke is left as a (considerable) exercise to the reader.

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Paul Arden
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Upward Force from Form Drag

#745

Post by Paul Arden » Sun Apr 29, 2018 5:39 pm

It would certainly be very interesting Walter. I sent Brice a message via Facebook. Hopefully he replies. It's something we definitely need to try.

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

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Walter
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Upward Force from Form Drag

#746

Post by Walter » Sun Apr 29, 2018 9:08 pm

Paul,

If it works I think it will be just as useful as the Tracker software for studying loop propagation Graeme found along with the videos a number of people such as Aitor, Graeme, yourself, Lasse and others have provided.

Cheers.
"There can be only one." - The Highlander. :pirate:

PS. I have a flying tank. Your argument is irrelevant.

PSS. How to generate a climbing loop through control of the casting stroke is left as a (considerable) exercise to the reader.

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Paul Arden
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Upward Force from Form Drag

#747

Post by Paul Arden » Mon Apr 30, 2018 4:56 am

I personally would be surprised if it works and think it will spit it out like wet spaghetti! Which is why we need to try it. Cheers, Paul
It's an exploration; bring a flyrod.

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Walter
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Upward Force from Form Drag

#748

Post by Walter » Tue May 01, 2018 5:08 am

Wet spaghetti makers are in high demand in the jungle I hear.

I think if the end wasn’t tethered it would look like something the cat threw up unless you want to use it to cast bead chains off the top of a building in which case it would turn into a bead chain fountain if the little wheels were turning fast enough. I haven’t found many fishing situations where that would be of any value though. Maybe a slinky shooter would be interesting but I don’t see much practical value in that either.

I think you need to convince NASA to send you into space so you can do some experiments in a weightless environment.
"There can be only one." - The Highlander. :pirate:

PS. I have a flying tank. Your argument is irrelevant.

PSS. How to generate a climbing loop through control of the casting stroke is left as a (considerable) exercise to the reader.

Stoatstail50
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Upward Force from Form Drag

#749

Post by Stoatstail50 » Tue May 01, 2018 7:53 am

if the end wasn’t tethered it would look like something the cat threw up
You could dust off the old catsick analyser Walter...
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Many men go fishing all of their lives without knowing that it is not fish they are after.

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Paul Arden
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#750

Post by Paul Arden » Tue May 01, 2018 8:26 am

So... end is tethered. It would be very interesting to try this because it would answer a lot of questions and solve part of the argument on the Board. I might have a go at building one in a week or two. If it works it will save the backcast which will speed up Snakehead shots :cool:

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

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