Both these brews have entered the next phase in their fermentation as I post this update following a night out on a steam train stargazing experience. Long story.
Summer Turbo is fermenting furiously if steadily; no yeast carpet at all left on top of the foam, which is made up up very small bubbles that disperse immediately, leaving no layer at all on top of the brew. There’s a strong fizzing sound from this FV, like Coke poured into a microphone, like acid dissolving part of a crime scene. The flakes of yeast which were seen earlier falling and rising are now gone, just a mist of bubbles rising through the murk and then popping at the surface, leaving nothing behind but a furiously popping airlock.
Farting Thrush is a different story. There’s not as much gas being produced but the visuals are better, with large clumps of yeast mimicking the rise-and-fall performance of Summer Turbo’s individual yeast flakes from yesterday. I’m still seeing a good carpet of yeasty gunk on the surface, so maybe Thrush will prove to be more of a long-term performer, though it’s certainly spectacular now. Time will tell.