Skeena, Alaska, CF Burkheimer, Olson, Teno, Danielsson, Guideline, Nextcast.
When you are casting head like Hover/int/sink 3, a rear part of the head which forms D-loop has a lower diameter/higher density then floating head and therefore cuts via air easier. This give a rod a bit better load/feels slightly heavier vs. floating.I wondered about that. The airflo scandi that I like is a 34' but I use it with a 10 tip. I'm casting 510 in the line and 80 in the tip--so 44' length and 590 total weight. I think the 5' poly is only 40 grains so I'll be casting 43' and 560 grains--a foot shorter and 30 grains lighter. I was wondering about the impact of possibly more load created with the 3d? Not sue if that's true?
Also few things to consider:
Rio 3D 480 gr is 34' long while 520 gr is 38' and 580 gr is 39'
480 gr and 580gr have the same weight ratio rear half of head to the front half. More
on 520 gr head rear half to front half is lower.
More weight distributed in the rear half = better load.
Considering that the biggest impact on a load has rear half, 480 gr 3D will load your rod very similarly as 520gr.
Personally, for above reason I do not like 520 gr version of Rio 3D either F-H-Int or How-Int-S3.
For some rods. like CFB 8142-4 where I needed 535-540 gr, I cut from the back 580 gr; 9/10 head, re-looped using polyurethane line form old Delta ( PU welds exceptionally well to PVC) and it works beautifully.