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Search found 1498 matches

by Walter
Mon Jul 01, 2019 8:57 pm
Forum: Flycasting Physics
Topic: Lift force acting on a fly line
Replies: 321
Views: 25199

Re: Lift force acting on a fly line

gordonjudd wrote:
Mon Jul 01, 2019 6:36 pm
the assumption is the fly leg will soon reach an equilibrium angle such that the weight of the fly leg is balanced by the upward force of form drag on that inclined length of fly leg.
Whose assumption is that?
by Walter
Mon Jul 01, 2019 2:15 pm
Forum: Flycasting Physics
Topic: engine and brakes
Replies: 50
Views: 6075

Re: engine and brakes

Graeme, I think you’ve also the hazards of hopping between inertial frames of reference without understanding the need to apply a Galilean Transformation when moving between frames. One can’t simply say that velocities in one frame are the same in another frame. A good example is the case where you ...
by Walter
Mon Jul 01, 2019 1:48 pm
Forum: Flycasting Physics
Topic: engine and brakes
Replies: 50
Views: 6075

Re: engine and brakes

Hi Graeme, Thanks for doing these plots. I think you’ve proven that the velocity profile of the line in the X direction is more like that of a rolling wheel (or in this case a rolling tank tread) than a rigid wedge shaped object. The X component of velocity of the inclined section at the bottom of t...
by Walter
Mon Jul 01, 2019 1:32 pm
Forum: Flycasting Physics
Topic: Drag and Tail Winds
Replies: 4
Views: 1142

Re: Drag and Tail Winds

If drag was lifting the loop then I think we would have shorter duration flight times when throwing with the wind. That would certainly be true if we thought the thing causing the lift was the bit of inclined line on the bottom of the loop and we thought it was it’s relative wind velocity that was ...
by Walter
Mon Jul 01, 2019 7:17 am
Forum: Flycasting Physics
Topic: Lift force acting on a fly line
Replies: 321
Views: 25199

Re: Lift force acting on a fly line

Maybe lift is caused by vortices around logs? :p :whistle:
by Walter
Mon Jul 01, 2019 7:14 am
Forum: Flycasting Physics
Topic: Drag and Tail Winds
Replies: 4
Views: 1142

Re: Drag and Tail Winds

Hi Lee,

I’m not sure what you are asking. Are you talking about how a tail wind affects drag, lift, turnover or something else?

Thanks for your videos btw.
by Walter
Mon Jul 01, 2019 7:11 am
Forum: Flycasting Physics
Topic: engine and brakes
Replies: 50
Views: 6075

Re: engine and brakes

Hi Walter, In this plot, it's Velocity magnitude. I'll change the data being plotted when I get home to show both Vx and Vy for each point shown there. I think you'd also enjoy looking at the same graphs for the Dolphin Nose casts. Some cool stuff going on in the fly leg leading into the loop. Vinc...
by Walter
Mon Jul 01, 2019 5:30 am
Forum: Flycasting Physics
Topic: engine and brakes
Replies: 50
Views: 6075

Re: engine and brakes

Thanks again Graeme, It’s refreshing to get some actual real world data presented without bias. One more question - you’ve probably said this before but, are the plots the X component of velocity only or are they raw speed? It would be interesting to to see separate X and Y components plotted for yo...
by Walter
Sun Jun 30, 2019 7:42 am
Forum: Flycasting Physics
Topic: Lift force acting on a fly line
Replies: 321
Views: 25199

Re: Lift force acting on a fly line

Thanks Graeme, I can think of other complications to add to your Ockhams Razor approach: - The lift supposedly comes from the inclined section of line between the front of the loop and the rod leg. Not all loops have this "sexy" shape but I don't see them falling any faster than the sexy ones. Are t...
by Walter
Sun Jun 30, 2019 6:30 am
Forum: Flycasting Physics
Topic: engine and brakes
Replies: 50
Views: 6075

Re: engine and brakes

Thanks Graeme!

What was the nature of that cast? Was it tethered or untethered? Asking for a friend... :D

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