Helix 1 or 2

RUDY

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just curious about a helix.I notice that alot of the Cats use a 1 stage helix usually a 36 degree.
Lately i've seen some guys using a 2 stage,is a 2 stage a good or bad idea for the mountians?
Also when should a 2 stage be used?
I saw on my m7 it says 6-9000ft use 36 degree and if in the 0-3000 to use a 44/40
Thanks
 
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