How tight is your bow?

[Richard Prowse]

I was practising the other day and working on tone. I suddenly got back into investigating something I had overlooked for quite a while - how tight my bow hair was. Now, I'm no scientist but, it makes sense that hair on a looser bow will make contact with more of the surface area of the string. I loosened my bow until I could easily push it onto the string and make the middle of the stick touch the hair - probably not a good test for German bows, but mine is an ex-French bow and the luthier designed the frog a little differently to keep the balance of the bow pretty much the same as it was as a French bow.
I was just wondering if anyone out there had thoughts on bow tightness, or had a system (eg. 3 complete winds) to keep the tightness of their bow regular.