It's very hard to find previous discussions on this using the search, but it seems like something that would have come up. I'm looking at a variety of speed charts all over the web, and they disagree with each other. Sometimes by 2x or more. I made a spreadsheet using Irwin's SFM formula and SFM charts, which comes up with wildly different numbers compared to several pre-calculated charts I could find. Do you have a chart you really like? Link?
Any reason to disbelieve the Irwin formula and SFM recommendations here? http://www.irwin.com/uploads/documen...ents_Guide.pdf
Any reason to disbelieve the Irwin formula and SFM recommendations here? http://www.irwin.com/uploads/documen...ents_Guide.pdf
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