<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
I used to have a WW II aircraft altimeter (out of an Aircobra)
installed in a Diesel LandRover when I first started pump work years
ago. The instrument took all the guesswork out of sizing pumps, and let
me know when the naturally aspirated Diesel was going to be making more
smoke than horsepower. An altimeter needs to be set every time you head
out, but they are accurate to within a few feet. Over the years, I have
used GPS, shot in elevations with transit and rod, used fine elevation
topos and guessed. :-) I agree that the only really accurate method, if
available, is to use a pressure gauge on existing plumbing, but an
altimeter is a close second and a GPS third.<br>
<br>
Matt T<br>
<br>
Jason Lombard wrote:
<blockquote
cite="mid31bc5b990901271402xc17d17fge4df99b59887b4aa@mail.gmail.com"
type="cite">William,<br>
<br>
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.<br>
<br>
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.<br>
<br>
Good luck,<br>
<br>
<div class="gmail_quote">On Tue, Jan 27, 2009 at 2:34 PM, William
Miller <span dir="ltr"><<a href="mailto:wrmiller@charter.net">wrmiller@charter.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Does
anyone have a foolproof tool to measure elevation? I have researched
GPS units recently. They are notoriously inaccurate for elevation:<br>
<br>
<a href="http://wiki.motionbased.com/mb/GPS_Unit_Elevation"
target="_blank">http://wiki.motionbased.com/mb/GPS_Unit_Elevation</a><br>
<br>
Here are few more links with GPS fundamentals:<br>
<br>
<a
href="http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html"
target="_blank">http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html</a><br>
<a href="http://www.gpsreview.net/electronic-compass/"
target="_blank">http://www.gpsreview.net/electronic-compass/</a><br>
<br>
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.<br>
<br>
<br>
<br>
William<br>
<br>
_______________________________________________<br>
List sponsored by Home Power magazine<br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org"
target="_blank">RE-wrenches@lists.re-wrenches.org</a><br>
<br>
Options & settings:<br>
<a
href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org"
target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
List-Archive: <a
href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org"
target="_blank">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out participant bios:<br>
<a href="http://www.members.re-wrenches.org" target="_blank">www.members.re-wrenches.org</a><br>
<br>
</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Jason Lombard<br>
Open Hand Solar LLC.<br>
Certified Sustainable Building Adviser<br>
<a href="mailto:openhandsolar@gmail.com">openhandsolar@gmail.com</a><br>
505 795 8646<br>
<br>
"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."<br>
<br>
—Thomas Edison<br>
<pre wrap="">
<hr size="4" width="90%">
_______________________________________________
List sponsored by Home Power magazine
List Address: <a class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a>
Options & settings:
<a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a>
List-Archive: <a class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a>
List rules & etiquette:
<a class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a>
Check out participant bios:
<a class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a>
</pre>
<pre wrap="">
<hr size="4" width="90%">
No virus found in this incoming message.
Checked by AVG - <a class="moz-txt-link-freetext" href="http://www.avg.com">http://www.avg.com</a>
Version: 8.0.176 / Virus Database: 270.10.14/1918 - Release Date: 1/27/2009 7:26 AM
</pre>
</blockquote>
</body>
</html>