Originally Posted by
jimmuller
At the risk of sounding like a four-year-old, I hafta' ask: But why?
I assume there must be a difference between the drag vs. speed behavior of mag and fluid. what is it?
You can go on line to the Cycleops site and view a comparison of "power curve" of the different trainers they sell. The power curve of the fluid trainer will be a curve where the the effort is compounded by how fast the rider goes. The mag trainer has a straight line increase of force needed to go faster. In real life riding somewhere around 17-19 mph the wind force will compound the effort needed to ride faster and that is reflected in the fluid power curve.
http://www.cycleops.cz/files/trainers.pdf