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Speed system pulleys

by Had Robinson

Miniplane continues to promote and sell the poor quality, flimsy Viadana pulleys for PPG speed systems, including those found in the start system.  On the other hand, the Harken small blocks are superior in every way and even cost less.  They have stainless steel bearings, low friction, and will last indefinitely.  The current batch of Viadana 22m blocks have significant friction because they do not even have ball bearings!  The Viadana blocks used for the starter pulleys have plastic ball bearings which fail after a hundred pulls on the starter.  A major point of failure in the Flash starter system used in the Miniplane Polini paramotors is this nearly useless pulley which self-shreds.

On the other hand, there is the superior durable 16mm Harken small block.  It even comes with a (7) year warranty (but it should last indefinitely in the benign environment of a harness speed system).  These blocks are designed to be used in a salt water environment with extreme loading from sheets and halyards.  Cost is less than $15.  APS has the best price with free shipping for (4) pulleys.

Harken 16mm small block