Lefty on Translation

“You don’t cast any harder at 20 feet than you do at 50 feet. You just start faster over a longer stroke.“

Lefty Kreh

4 comments on “Lefty on Translation

  1. HK says:

    Shouldn’t Lefty have said you don’t cast any harder at 50 feet than you do at 20 feet? It seems to me that since 50 feet is further than 20 feet, one would naturally think 50 feet would require a “harder cast” = more effort. So 20 feet would require less effort.

    Has Lefty butchered the English language protocol or am I wrong?


    • Aitor says:

      The energy we need to propel our line in order to present our fly fifteen meters away is higher than the energy required to put our fly only six meters away. Common sense.

      However, energy and force aren’t the same thing. The amount of energy is fixed, but the force needed is variable.

      Think of a road that goes through a mountain pass. The engineers could design a road climbing up in a straight line, however that is never the case: they build a road that climbs up very progressively by means of curve, after curve, after curve. In that way they increase the distance a vehicle have to cover, so the energy needed to reach the pass is the same in any case, but wit a longer road the amount of force is much less.
      The same principle applies to gears in a car transmission or a bicycle. When you are riding your bike and reach a steep slope you change gears to the biggest sprocket. What you feel is that you need to pedal more times per minute, but with much less force.

      The Physics explanation is based in the concept of Work, which is the same as energy, that, in fly casting, translates into velocity. More work = more energy = more line velocity = more distance.

      The formula for work is: W = F.d (force times distance).

      What this means is that you can increase work (i.e. line velocity) by means of increasing distance and keeping force constant.

      That is the reason for translation within the casting stroke being more than a stylistic choice.

      So Lefty was right. He probably didn’t know the Physics but his intuition and experience served him well.


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