5xRig and 3xRig = ???

[TreeSpyder]

Pulley systems have been called "flexible levers" (even though they are inline devices that increase powers arithmetically, not geometrically). But, we can get more out of them like non-flexible levers) by compounding them (for a more geometric increase) and by making them more of a closed system (in some of the parts). The Spanish Burton 'Family' does this with separate lines, but shared sheaves. So isn't so much like one whole system compounding on another, for the separate systems aren't necessarily discernible as fully separate systems on their own.

 

This (below) goes on to show more than 21xEffort; so that a 100#Man with a 50#ArmPull has the potential to pull 3700#(for edumacational and discussion purposes only-Do Not Try this at Home-okay, who's 1st?)

 

MyTreeLessons.Com/Flash/pulley21xRig.Swf

 

As any potential thus, it will not be reached, for as the multipliers of the full efficiencies of the pulleys compounds, so does the their reciprocal inefficiencies become compounded. Like 7 sheaves in series will drop you down to about 75% of potential, even if the sheaves are a fairly high efficiency like 95% each.

 

For, there is no 100% efficiency at a point of conversion(pulley, pivot etc.), or there would be perpetual motion. So, at a conversion point, everything is broken into it's efficiency and it's reciprocal inefficiency (as cost of the conversion).

Edited February 28, 2009 by TreeSpyder

[bob]

nice one thank you

[Ben]

Very good, I believe Petzl used to have a Pulley demo bit on there website

[Sciadopitys]

Interesting stuff mate!

[TreeSpyder]

Thanx, meant to include this Spanish Burton 'Family'