Slackline Load Calculator

Length of your slack/long/highline, either meters or feet

Total height of drop in middle of slackline with slacker, same units as above

Weight of slacker, either lbs or kg (both work)

For use with rope multiplier system

Estimated: 3" ball bearing=95%, 1.5" bushing=75%

I'D, GriGri, Eddy or whatever. Should be ~60-75% MPD=~95%

Should be 4-25%, unless using Spider Silk

Line Tension
 

Static force with non-moving slacker in middle of line (lbs or kg, whichever you used for slacker weight)

Line Stretch w/ Slacker (%)
 

Stretch of slackline with slacker %

Line Stretch w/ Slacker (Length)
 

Stretch of slackline with slacker length

Mechanical Advantage Efficiency
 

Efficiency of pulley system with brake

Theoretical MA
 

Highest possible mechanical advantage with system

Efficiency Loss MA
 

Actual mechanical advantage with pulley system and brake loss

Line Length (un-stretched)
 

Minimum length of slackline required for final (stretched) length

Minimum Pulley Throw (length)
 

Minimum amount of pulley length required to tension line to desired length

Minimum Pulley Rope Length
 

Minimum length of static rope required for desired tension/length

Pull Force Simple MA
 

Force required to tension system (at brake)

Pull Force Multiplied MA
 

Force required to tension system (multiplied 3:1 after brake)

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