Found this link to an interview with Chip Chase on his Whitegrass page.  It’s a bit long but gives the whole story.  It’s remarkable.  There’s about 6 1/2 minutes of lead-in before you get to the interview.

https://freeheellife.libsyn.com/42-chip-chase

Thanks for sharing the interview Denis.  Terrific.  This link provides a clip of the super old ski film Chip talks about at about the one hour point, White Ecstacy, 1931: 

https://www.youtube.com/watch?v=KOH1Mvy0nfA&feature=emb_logo