I’m very confused by this.
Are you saying that you got on the trainer, pedals at a flat cadence, never shifted, and that the trainer, over the course of 11min, increased reported watts by 133?
Because one, typically when they heat up, the fluid viscosity decreases (becomes thinner.) You would expect less resistance as it heats up, not more.
Two, are you saying that the increase just happened to perfectly match the ramp? That makes little sense.
I am probably just interpreting your point wrong, but I’m very confused. Thermal drift typically means the trainer becomes a little bit easier once it warms up.
EDIT: Interesting… I found this thread on Slowtwitch discussing the warmup period of the Fluid 2. For one, it does seem like that trainer gets harder as it warms, not easier. Two, people are discussing that it’s a super dramatic switch, not gradual. Thirdly, that it’s on the order of 30-45 W.
So what’s the takeaway here? I have no idea. What an odd behaving trainer.
EDIT 2: Oh but wait, there’s more. @Jonathan wrote about the Fluid 2 equation back in 2011. They were talking about virtual power (not relevant since you’re using actual PM), but the comments are really interesting:
Erwin, when I am warming up at a (zone 2) effort I can “feel” my fluid 2 trainer make that jump from not being warmed up to, yep it is warm now! To me it feels as if I were to just shift into the next gear. I would think that it would be the same for all the fluid trainer 2’s. This seems to happen right at the 5 minute mark every time no matter my speed of the warm up.