Snipped for post brevity
Oh, awesome. So the Quora guy agrees completely as he gives 0.1 m/s^2 at the low end, and we're talking about a speed around 20% of that. The second source you link is very clear that it's talking about *vibrating* acceleration, which is not what's being discussed. Even if it were, it suggests our 0.02 m/s^2 is on the very lowest edge of human perception. Both of your sources appear to be in agreement that we should not be able to feel the acceleration due to the spin of the Earth. Even 'best case' suggests it would be likely difficult to do so, assuming a set of circumstances that aren't reality. Thank you for presenting a rather strong case against your own premise.
Ranges between 0.01 m/s^2 and 0.0221 m/s^2 are in the "probable perception" to "clear perception" range. Yet no one has perceived the rotation of the earth. Why?
The author of the quora article who wrote a thesis on the subject told us to look up vibrational perception. It makes sense. We are detecting different accelerations depending on which direction we face, and can go from minus to plus depending on one's position. Yet again, however, no one has felt this acceleration.
Those ranges are for something vibrating at speeds of 2-20Hz, and I would wager the low vibration end is towards the higher Hz end. He specifically calls out an elevator too, noting the lowest was around 0.1 m/s^2. The elevator is much closer to normal conditions on Earth.
But sure, lets go with just spinning, and we'll go with the best case scenario, looking for 0.0221 m/s^2 is detectable. But wait, we *also* have to account for the 'noise' we'll be making as we spin. That will be far more noticeable most likely. So if we go with our 80kg guy from before. The average length from hip to hip is about 3.6m. We'll cut down to 1.2m radius and 40kg. I think that should give us a rough sort of midpoint, but I'll run a few others too for fun. That gives us a speed of spin of roughly 15 m/s^2 for our 40k, generating centripetal force equal to 7500 Newtons. That's about 764 kg m/s^2 of force. Not sure anyone is gonna notice an extra 0.0221. Well let's see what we can do to get this a bit more favorable, shall we?
Hrmm, the lowest I'm getting, using the shortest person to have lived, gives me about 23.2 kg m/s^2. For whom I was being somewhat generous as well imo. Radius of 0.30m (about his 'center' using a similar method as above), gives us a velocity of 3.7 m/s^2, and a weight of 5kg. I'm not seeing what part of you is supposed to have felt this acceleration Tom, especially not feeling it over simply the force generated by spinning yourself around. Feel free to check my math if you like, I encourage it in fact. But your hypothesis that we should be able to feel it by spinning is looking dead in the water again.