Slackline Pulley System Calculater

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You can calculate actual mechanical advantage of slackline pulley system.

The actual mechanical advantage calculated by considering the efficiency of the pulleys.

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Brake fficiency reference data

ModelSpecefficiencySAUCE
Petzl Pro Traxionself Jamming90‐92Slack Science
Petzl Pro Traxionself Jamming95official data
Petzl micro Traxionself Jamming91official data
Petzl IDDescender20-40
Petzl GriGriBelay Device30-50Slack Science
EdyBelay Device30-50
CMC MPDMulti-Purpose
Device
95

Pulley Efficiency reference data

ModelSpecefficiencySAUCE
SMC 3″ Doublebearing94~96Slack Science
Pwtzl Partnerbearing91official data
Petzl TWINbearing97official data
Petzl RollclipCarabiner pulley
bearing
85official data
Petzl rescuebearing95official data
Petzl  MINDERbearing97official data
Petzl fixbushing71official data
Oval CarabinerCarabiner42-56Slack Science
climbingtechnology
ORBITER T
bearing96official data
Climbing Technology ORBITER Sbearing96official data
Climbing Technology ORBITER Mbushing80official data
CAMP single bussing 2 3/8”bushing86-88Slack Science
CAMP doubles are 2 3/8”bearing92Slack Science
CAMP JANUS PRObearing97official data
CAMP JANUS bushing90official data
CAMP DRYADbushing80official data
CAMP DRYAD PRObearing92official data
Pulley efficiency is critical to a high-performing tensioning system. We find that switching from a mid-grade pulley setup to the PMPs will yield a moderate to ...

Example

The brake is first pulley of the multiplier part.

Base: 600-5(100-95)-4(100-95)-3(100-95)-2(100-95)-(100-92)=522

Multiplier : 500-4(100-90)-3(100-85)-2(100-90)-(100-92MPD)=387

522%*387%=20.20

total MA 20.20:1

■5:1redirect  (2+3):1
all multiplier pulleys 90%
break 50%

200-2*(100-90)-(100-90)+(300-2*(100-90)-(100-90))*(100-50)=305

Calculating Forces in the Pulley Mechanical
Advantage Systems Used in Rescue Work

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