Popper timing is different for every popper and every day of the year.
Because they draw in a lot of air they very susceptible to ambient temperature so a day with a 5 degree higher temperature will result in faster roasts. Add to that the fact that the exact same brand of popper side by side will roast differently and you learn quickly that don't get too hung-up on the timing... it is what it is!
Try 80g in the popper, which is about to the top of the "shark fins", it is often about the right amount.
As for the cracks, your description seems about right for second crack, on that fast a roast first crack and second crack can overlap.
First crack sounds like popcorn
Second crack sounds like cellophane rustling.
Take lots of notes what works and what doesn't, try and only change one thing at a time and pretty soon you will all over it.
Enjoy the roasting journey.
Because they draw in a lot of air they very susceptible to ambient temperature so a day with a 5 degree higher temperature will result in faster roasts. Add to that the fact that the exact same brand of popper side by side will roast differently and you learn quickly that don't get too hung-up on the timing... it is what it is!
Try 80g in the popper, which is about to the top of the "shark fins", it is often about the right amount.
As for the cracks, your description seems about right for second crack, on that fast a roast first crack and second crack can overlap.
First crack sounds like popcorn
Second crack sounds like cellophane rustling.
Take lots of notes what works and what doesn't, try and only change one thing at a time and pretty soon you will all over it.
Enjoy the roasting journey.

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