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Logging eTool
 
Kinds of Notches

 
Open-faced Notch   Conventional Notch   Humbolt Notch
Open-faced Notch
Click here to learn
how to cut an Open-faced Notch

 
  Conventional Notch
Click here to learn how to cut a Conventional Notch
 
  Humbolt Notch
Click here to learn how
to cut a Humbolt Notch


 
Total angle ideally 90 degrees; at least 70 degrees   45 degrees   45 degrees

Top Cut angled downward
70 degrees
  angled downward 45
degrees
  flat horizontal

Bottom Cut angled upward 20
degrees
  flat horizontal   angled upward 45
degrees

Back Cut horizontal; at the same height as the corner of the notch   horizontal; at least 1 inch above the bottom cut   horizontal; at least 1 inch above the top cut

Depth 1/4 - 1/3 of tree diameter 1/4 - 1/3 of tree diameter 1/4 - 1/3 of tree diameter

Point of notch closure just before tree hits
ground
  middle of fall   middle of fall

Degree of safety high medium medium

Advantages greater accuracy of
felling into target area

hinge stays intact until tree hits ground

less danger of kickback and other out-of-control movement
  familiar to many loggers   saves slightly more
wood

familiar to many loggers

Disadvantages hinge may have to be
cut off
  hinge breaks early   hinge breaks early


 
   
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eTools Home : Logging  Standards | Glossary | Bibliography | User Guide | Credits