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Search found 1372 matches

by gordonjudd
Sat Aug 15, 2020 1:47 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

But it does come into play for the angular momentum of the the distributed mass of the line going around a semi-circular loop. and I don't think it does. Dirk, Sorry for the detour, but this should be quick. In that case, what do you get for the angular momentum of the distributed mass having a lin...
by gordonjudd
Fri Aug 14, 2020 9:09 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

From 7 years ago, fluffy mpr line throw into the wind Lasse, And would you say the loop propagation going down the red portion of that line stalled and did not roll out before it hit the ground in that cast against the wind? https://imagizer.imageshack.com/img923/4007/lRBFxs.jpg Did you try it with...
by gordonjudd
Fri Aug 14, 2020 4:23 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

but rather an answer that is formulated and hopefully agreed on by everyone!
Paul,
That is a big ask, and in my experience would be a first for technical discussions on Sexyloops.
Gordy
by gordonjudd
Fri Aug 14, 2020 4:20 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

Horrible conditions for distance James, Were you casting with or against the wind when you released your running line? Drag will have a big impact on the resulting line flight. It would be interesting to cast in both directions to see the impact that drag has on the loop propagation of a flying loo...
by gordonjudd
Fri Aug 14, 2020 4:16 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

we have seen that loop radius makes no difference regarding tension. Dirk, But it does come into play for the angular momentum of the the distributed mass of the line going around a semi-circular loop. You should work this out as a check but I get the angular momentum to be equal to: L=\pi*\rho_l*r...
by gordonjudd
Thu Aug 13, 2020 2:34 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

For laymen my recommendation is: no equation, no internal force, no change in momentum over time, no subsystem. Merlin, Doesn't that view support Paul's A2 answer that "momentum of the fly leg is the driving force of the loop"? To me that concept (though widely accepted) is wrong on two counts. Mom...
by gordonjudd
Wed Aug 12, 2020 1:49 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

Here is a trace of a released hand hauled cast,
Dirk,
Now we are getting somewhere.
Could you use tracker to get similar data for one of your thrown dud casts as well.

Thanks,
Gordy
by gordonjudd
Wed Aug 12, 2020 1:44 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

I did not mention “conservation” Gordy, but in fact the calculation was neglecting the loop and also air drag for easiness. Merlin, With no outside force would momentum be conserved in an un-tethered cast? I would think that drag must enter into what happens as there has to be something to explain ...
by gordonjudd
Wed Aug 12, 2020 2:51 am
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

I agree with Merlin about the loop size having no influence on tension. Dirk, That is true as there is no radius term in the rho_l*V_tangential.^2 tension equation. Dr. Biggins has noted it also does not depend on the shape of the loop. I leave it to the beholder to decide if any rod leg was presen...
by gordonjudd
Tue Aug 11, 2020 7:24 pm
Forum: Flycasting Physics
Topic: Covered topics /how it works
Replies: 130
Views: 8846

Re: Covered topics /how it works

For an untethered cast, you have 2 unknowns (legs speed) and two equations (energy, momentum). Merlin, Does the drag on the two legs and the loop not enter into your analysis? I would not expect momentum to stay the same since the line has outside drag forces acting on it. As I said before, the rul...

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