Strange question of physics in casting

[Angrybear]

Prompted by a joke on a shooting forum, has anyone ever worked out the physics of a cast ?
As an example if the world record is 313m with 125g (339yds - 4oz) what sort of velocity & initial energy did that lead have ??
Google has failed me as have my shooting ballistic programs so I wondered if someone in the casting world had worked it out ?
the shore section seemed the place to ask.

 

[crablante]

I imagine the cast would need some basic physics ingredients?

• 45 degree initial trajectory (maths - max distance)
• ultra light main line (less drag)
• aerodynamic lead on a swivel (allow it spin for improved stability)

 

[Angrybear]

Maybe, but if you have the weight - distance & flight time you can get started on the energy & velocity.
I'm stuck because I don't know the time the lead was in flight.

 

[DaveH]

That's interesting. You could look at some of the championship casts on YouTube to obtain a flight time.

I can tell you (personal experience, and also bloody obvious) that a short rod will not allow the same distance as a long rod - also a stiff (cheap) beach caster is less efficient than a through-action.

 

[flappy]

Will also depend on wether you are right or left handed.

 

[The Third Earl]

And if you have a following wind.

Dave

 

[Valleyboy]

Prompted by a joke on a shooting forum, has anyone ever worked out the physics of a cast ?
As an example if the world record is 313m with 125g (339yds - 4oz) what sort of velocity & initial energy did that lead have ??
Google has failed me as have my shooting ballistic programs so I wondered if someone in the casting world had worked it out ?
the shore section seemed the place to ask.

Use your ballistics program. Newtonian physics is universal. You'd have to factor in additional drag and the inertia the line causes

 

[Kine262]

distance unit measured bias + angle slope squared / quantitive unit equation sum + time in order numeration

 

[flappy]

And if you have a following wind.

Dave

Sounds like concrete.

 

[chesilpete]

how would you calculate the drag.... it's not a linear calculation.... the rest I am sure is quite Googleable but the variable drag I have not a clue.
I suspect you may be able to make some assumptions working backwards.

 

[Bigfish]

how would you calculate the drag.... it's not a linear calculation.... the rest I am sure is quite Googleable but the variable drag I have not a clue.
I suspect you may be able to make some assumptions working backwards.

Count it as friction "maybe"

 

[chesilpete]

There's some much smarter people on here than me but I think this is one of those things where you can get close but never capture all the variables...

Count it as friction "maybe"

 

[Valleyboy]

how would you calculate the drag.... it's not a linear calculation.... the rest I am sure is quite Googleable but the variable drag I have not a clue.
I suspect you may be able to make some assumptions working backwards.

The fact that all the line is in motion from the beginning of the cast and benefits from the flywheel effect of the spool is going to factor in as will spool mass, wind strength and direction loads of things. I'd ask my daughter but she'd probably tell me to piss off

 

[crablante]

...I think this is one of those things where you can get close but never capture all the variables...

I totally agree - this is inherently complex - you'll have to make reasonable assumptions in order to simplify the problem like "...drag due to main line is negligible because using 5lb braid..." etc etc

A "simple" calculation should give you a ballpark answer if you know the initial angle and speed of the casted sinker, it's surface area, and air density...

 

[Valleyboy]

I totally agree - this is inherently complex - you'll have to make reasonable assumptions in order to simplify the problem like "...drag due to main line is negligible because using 5lb braid..." etc etc

A "simple" calculation should give you a ballpark answer if you know the initial angle and speed of the casted sinker, it's surface area, and air density...

If you include air density you will need to include windspeed and direction

 

[crablante]

If you include air density you will need to include windspeed and direction

You could - you don't have to - it comes down to how much you wanna simplify the "maths", for example you could assume factors like like wind, main line drag, etc are having a negligible impact.

 

[Valleyboy]

You could - you don't have to - it comes down to how much you wanna simplify the "maths", for example you could assume factors like like wind, main line drag, etc are having a negligible impact.

Have you ever fished? Wind has a negligible impact but "air density" does? On yer bike

 

[Angrybear]

Use your ballistics program. Newtonian physics is universal. You'd have to factor in additional drag and the inertia the line causes

I can't because the program needs the "muzzle velocity".
I hoped I could use the program & work backwards using the flight time to find the rough initial velocity

 

[crablante]

Have you ever fished? Wind has a negligible impact but "air density" does? On yer bike

I think you're missing my point - you can simplify the maths by assuming certain factors are having a negligible impact.

For example - assume it's a non-windy day.

 

[Valleyboy]

I can't because the program needs the "muzzle velocity".
I hoped I could use the program & work backwards using the flight time to find the rough initial velocity

Tough one to calculate that without the equations.