Gerry van Dyk schreef:
Don't feel the least bit stupid over this, Reynolds number is a
horribly misunderstood thing.

Thanks for reassuring me Gerry, you mailed this while I was replying to
Cavelamb.

(snipped useful explanation)

Reynolds number basically puts a value on the quantity of air working
on a wing for a given unit of time. If you reduce speed or reduce
size, then less air works on it. Increasing speed or increasing size
increases the amount of air working on it.

This is a hard nut to crack, but it looks like it might be the key to my
understanding. Will sleep over it now, and let the information soak this
poor old brain...