I sincerely hope folks here will not consider that I'm being too premature in my conclusions over this subject, despite it's being discussed for only about a week or so, but... It seems to me based on what I've heard so far that there is quite strong arguments in favor of Hz as a replacement for the rpm stuff.
Having said that let me propose that we approach the powers at be with an official proposal to request that they, at a minimum, consider including Hz as a measurement tool for engines' revolution characteristic. Following Pat's nice "rules of thumb" procedure, here are some interesting benchmarks for you to relate to when it comes to this aspect in cars: Idling: 10-15 Hz Gear Shifting: 40 Hz Cruise: 50-60 Hz Performance (normal cars): 100-150 Hz Performance (competition formulae): 200-300 Hz! Marcus On Wed, 17 Jul 2002 21:10:08 metric wrote: >> Of Ma Be >> I feel quite strongly that rpm is also another... "idiocy" we could do >> without > >I got my second degree in a sound and vibration institute: >http://www.human-vibration.com/HFRU_pages/hfru.htm > >Hertz was part of everyday speech. The only difference between Hz and >rpm is that the second is the base for one and the minute for the other. >Since the second is an SI unit, that puts the Hz above rpm. > >You can almost directly perceive the Hertz value for ship motion simply >by counting. I can't think of an example where an rpm value can be >directly perceived because a minute is too long. > >People are quite happy discussing 50 Hz for mains electricity. We had to >deal with it as interference with our data all the time, I can't imagine >discussing 50 Hz as an rpm value (although that is a good old conversion >issue). > >Of course, using Hz means that there is a seamless integration with high >frequency applications like radio. > >I have often thought that car rpm meters should be in Hz. > >Having said that, I think Hz is an unnecessary unit and might be better >replaced with inverse seconds i.e. s-1 (with the correct superscript). >-- >Terry Simpson >Human Factors Consultant >[EMAIL PROTECTED] >www.connected-systems.com >Phone: +44 7850 511794 > > > > Is your boss reading your email? ....Probably Keep your messages private by using Lycos Mail. Sign up today at http://mail.lycos.com
