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Search found 1858 matches

by gordonjudd
Tue Feb 23, 2016 2:44 pm
Forum: Flycasting Physics
Topic: Counterflex in relation to max rod bend
Replies: 13
Views: 8815

Counterflex in relation to max rod bend

I am not sure about the angle measured, we cannot see exactly where the tip goes, Merlin, I don't think that the deflection in the rod should be measured by angle as that has nothing to do with the spring constant of the rod. As Grunde has shown the way to measure deflection is the perpendicular di...
by gordonjudd
Sun Feb 21, 2016 8:32 pm
Forum: Flycasting Physics
Topic: Dolphin nose
Replies: 424
Views: 137569

Dolphin nose

Which does not give the same result! One cannot override the sign of the Vloop in the rho_l*Vloop just because we know it's a mass gain? Dirk, Technically, I don't understand which sign convention to apply to the momentum flux to get the direction of the force. But here is how I see the relative dm...
by gordonjudd
Sun Feb 21, 2016 3:08 pm
Forum: Flycasting Physics
Topic: Dolphin nose
Replies: 424
Views: 137569

Dolphin nose

The dot product of two vectors is a scalar. V and V are both vectors... Walter, The calculation of the magnitude (and direction) of the rho_l*v_loop.^2 momentum flux value does not involve two vectors. It involves the product of dm/dt (a scalar) and V (a vector). I would think that since mass is a ...
by gordonjudd
Sat Feb 20, 2016 9:33 pm
Forum: Flycasting Physics
Topic: Dolphin nose
Replies: 424
Views: 137569

Dolphin nose

Dirk,
I don't think that is the case. The magnitude of the squared +v or squared -v values would be the same but the unit direction vector for the velocity would still be in the plus direction for the top leg and in the -x direction for the bottom leg in your moving frame.
Gordy
by gordonjudd
Sat Feb 20, 2016 12:30 am
Forum: Flycasting Physics
Topic: Dolphin nose
Replies: 424
Views: 137569

Dolphin nose

Was your picture of the loop accelerating on a dropped loop? Steve, No, as shown in the video, It was propagating along the tar paper on the ground in the x direction. Gravity was into the paper. The speed of the loop in that picture was around 2.6 m/s at the start and 5.6 m/s as the loop was going...
by gordonjudd
Fri Feb 19, 2016 4:44 pm
Forum: Flycasting Physics
Topic: Dolphin nose
Replies: 424
Views: 137569

Dolphin nose

I asked him for video hoping to see during what stage of the cast the slack arose. Dirk, I don't think the flutter that is going down the fly leg means there is slack (i.e. no tension) in the fly leg. If there was no tension there would be no propagation of the flutter down the line. You can see si...
by gordonjudd
Wed Feb 17, 2016 2:00 am
Forum: Flycasting Physics
Topic: Dolphin nose
Replies: 424
Views: 137569

Dolphin nose

Momentum change doesn't generate a force to keep accelerating the fly leg and increasing tension. Vince, Why not? If there is a relative velocity change in the two legs (say you used an external force at the end of the loop before t=0 and then let go of the free leg to get it going. At some later p...
by gordonjudd
Wed Feb 17, 2016 1:26 am
Forum: Flycasting Physics
Topic: Dolphin nose
Replies: 424
Views: 137569

Dolphin nose

If you are referring to acceleration due to gravity it stays the same regardless of the direction you fire the cannon. Walter, You are correct that for a cannon ball the component of acceleration in the y direction stays the same so that was not a good example. However for the the line the directio...
by gordonjudd
Tue Feb 16, 2016 6:35 pm
Forum: Flycasting Physics
Topic: Dolphin nose
Replies: 424
Views: 137569

Dolphin nose

fly leg just before the wall is showing a definite buckle.
Walter,
What is the size of the dip in that buckle compared to the dip in a DN? I don't think they are in the same ball park, but then we see what we want to see.
Gordy
by gordonjudd
Tue Feb 16, 2016 5:01 pm
Forum: Flycasting Physics
Topic: Dolphin nose
Replies: 424
Views: 137569

Dolphin nose

Surely fly line can go through a 90 degree bend? Just the bend radius may be wider? Dirk, Of course. It is even happy making a 180 bend but it can't do it with a near zero bending radius. By the same token, I think the viscoelastic properties of the line is the reason we see DN loop shapes on narro...

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