If you know someone who either paraglides or hanglides or is a sailplane pilot; today's pilots fly with electronic flight log & variometers that are +/- 3 to 6 feet. If you measure the low and then proceed to the high point next, These units work off of barometric pressure and are quite reliable, just do not measure the low one day and then the high a day or week later. I have used mine a number of times and been right on so far 100% of the time when we have measure the standing static pressure down the road.
Thanks - Dana Orzel Great Solar Works, Inc www.solarwork.com E - d...@solarwork.com V - 970.626.5253 F - 970.626.4140 C - 970.209.4076 "I'd put my money on solar energy. I hope we don't have to wait 'til oil and coal run out before we tackle that." -Thomas Edison, in conversation with Henry Ford and Harvey Firestone, March 1931 From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Jason Lombard Sent: Tuesday, January 27, 2009 3:02 PM To: RE-wrenches Subject: Re: [RE-wrenches] GPS units William, Topographic maps are great if your familiar with them. A laser if you can afford it or the best I have heard of is fill a tube or pipe with water from the pump to your tank and measure the psi at the base of it. The calculation is 2.31 feet of lift for every psi. Not everyone has their piping rolled out or on site yet so this could be a challenge and again is very accurate. BTW - GPS units are inaccurate to the extent that they are 40 feet off horizontally and 90 feet vertically. This means you could be up to 130 feet off. Big difference when your sizing for particular pump out put. Good luck, On Tue, Jan 27, 2009 at 2:34 PM, William Miller <wrmil...@charter.net> wrote: Does anyone have a foolproof tool to measure elevation? I have researched GPS units recently. They are notoriously inaccurate for elevation: http://wiki.motionbased.com/mb/GPS_Unit_Elevation Here are few more links with GPS fundamentals: http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html http://www.gpsreview.net/electronic-compass/ I have a Suunto Observer watch with an altimeter. I think I can get relatively accurate measurements of DIFFERENCE in elevation if I measure the two elevations in quick succession. I will be trying it. William _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org -- Jason Lombard Open Hand Solar LLC. Certified Sustainable Building Adviser openhandso...@gmail.com 505 795 8646 "I'd put my money on solar energy. I hope we don't have to wait 'til oil and coal run out before we tackle that." -Thomas Edison
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