Slackline Pulley System Calculater

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You can calculate actual mechanical advantage of slackline pulley system.
Very useful calculation form to consider the pulley friction.

EXAMPLE:I’D 40%, GriGri 50%, Eddy 50%~60% , MPD/Petzl-tracxion92~95%,
EXAMPLE: 2″ball bearring=92% ,3″ball bearing=95%, 1.5″ bushing=80%~90%


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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

Maximum(starting) pulling force is calculated by decreasing the magnification.

In the above example, multiply 6 by 4.

Pulley Efficiency reference data

 

SMC 3″ Double 94~96
CAMP doubles are 2 3/8” 92
CAMP single bussing 2 3/8” 86-88
Bussing 1 3/8” 70-77
Pro Traxion 90~92
Grigiri 29-49
Edy 50?
ID 40?
MPD 95?
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 ...

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