I sent you the methodology, PaulI think the only way to determine frequency is with a frequency test. Ie locking the rod butt horizontal, pulling the tip down and measuring how many times it vibrates per second
Magnus is correct; the 10 won’t necessarily have a higher frequency than the 6. It certainly “feels” faster with a 5 line but I’m not sure what that says.
On the paper, and for a given family of rods, a 10 has a slightly higher loaded frequency (same carry of course), but this is small (a few %). The 10 being heavier it also has a slightly larger inertial effect on line speed.
This is interesting because it shows that you cannot use the full potential of a higher torque. You certainly use a higher one with the 10, but not to the point where you can keep the same arc. It is then very difficult to predict if you get a higher speed with the 10, and by how much. For sure there is an effect of the line flight on the distance you can achieve (loop size, loop morphing), but without any measurable proof, we can only speculate.and my arc is less with the HT10.