If you mean your video, yes .. I don't know what I should look for, I've found a blog entry:Personally, I believe it to be a huge, big, red herring
https://thelimpcobra.com/2012/11/20/ben ... mechanics/
The author writes there:
Well, I can see both differences of loop shapes and velocities, in that video sometimes a loop leads - I'm guessing "very similar" is a subjective term. One problem of such experiments is to replicate same initial conditions, in this case the rods have a different length and I'm sure that the rod grip has already an influence on the cast.as we’ll see below, Lasse Karlsson has taped two very different rods together to cast them at the same time with two identical lines of the same weight rating. simultaneous loop formation, loop shape and loop speed are very-very similar with both rods.
I suppose the statement should be that the rod action does not have the greatest effect on distance, there is a study about this subject:
As you can see, the average distance is very similar, although there is a great variance of the stiffness.
It would be very interesting to compare though, if these observations are still valid today, e.g. I've seen most guys have used 8wt rods and above in Tallinn.
I don't know if we can say that always, AFAIK Grand's record with a greenheard rod stood for a long time and I know same happened with salmon distance T120 in casting sport, one German had the world record for some time with a GDR Kuckuck salmon rod (very heavy weighting over 1kg).The Casting competitions suggest a light stiff rod is the best option for maximum line speed. Regardless of the mathematical models.