[ray sowers]

Originally Posted by Mike Schwartz

LGT a amazing video of a 5-axis milling machine carving a full-size helmet out of a solid block of aluminum. How soon before NHRA requires one of these?

http://singularityhub.com/2010/04/05...-butter-video/

Being an old geezer I remember Clymer brand racing helmets in A.M.A.motorcycle 1/2 mile dirt track racing around 1949 and later. They were also used by Indianapolis U.S.A.C. drivers. I personally wore one in drag racing in 1958 and 1960
in my N.H.R.A. Altered Roadster.
The helmets were lined with cork inside the aluminium cup and had leather straps for around the neck. They also had a small bill on them.