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Richard Cullip (RichardCullip) - BPL Premium Member

My Locale San Diego County
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All Forum Posts by Richard Cullip

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Re: Re: Re: Re: Artificial but useful
Glenn - I forgot to mention that those equations expect elevation in feet, relative air pressure in inHg and yield boiling temperature in Fahrenheit. These are the units I'm used to working in.

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 26, 11:07pm

Re: Re: Artificial but useful
Glenn - you convinced me a few pages ago. I've found some ugly, but once coded up, nice equations that use Elevation and Relative Air Pressure to calculate, first Absolute Air Pressure and then...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 26, 10:45pm

Re: You bet I'm confused
Barometric pressure as reported in weather reports and as measured by barometers are relative pressures not absolute pressures. Local atmospheric pressures are adjusted for elevation to reflect wha...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 26, 10:10pm

Re: Got it & another question
Galen - Is it possible the prior spreadsheet is showing the fuel used in ml while the new spreadsheet is reporting it in grams? 10.2/13 yields 0.785 which is remarkably close to the density (g/...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 26, 10:21am

Re: ml
Delmar - you're right. I mis-wrote grams when I should have said ml. I went back and edited my other post to clarify the oops I made. It's hard not to get sloppy with units since there&...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 25, 10:11pm

Re: Good Catch, Indeed.
Delmar - the .78x is the density of alcohol expressed in g/ml. Set B8 to g/ml if you are entering the fuel amount in ml. (edited to correct my original which errantly said grams)

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 25, 9:23pm

Glenn - we are both right .... LOL
Glenn - We are both right. Density of alcohol is temperature dependent. Density of ethanol is .785 @25C and .789 @20C. Methanol comes in at .7865 @ 25C and .791 @20C

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 25, 5:55pm

Why the Big difference
Okay guys, my head is officially spinning but, no worries, I've wrapped it duct tape to make sure it doesn't explode. I now know way much more then I ever cared to about barometric pressure...

In Make Your Own Gear » Improved Stove Efficiency Calculator/Spreadsheet
April 25, 5:06pm

Re: Don't know if this is right
Galen - did you adjust the heating value to match your fuel? Canister gas, typically a mixture of propane and butane, has almost twice the heating value as the fuel used in alcohol stoves. If you d...

In Make Your Own Gear » The Alcohol Stove “Efficiency Percentage” Test Thread
April 24, 2:37pm

Re: Some comments
Glenn - I like working in BTUs as it eliminates the need to convert temperature from Fahrenheit to Celsius. It takes 1 BTU to raise a lb of water one degree F. All you need to do is convert lbs to ...

In Make Your Own Gear » The Alcohol Stove “Efficiency Percentage” Test Thread
April 22, 7:27pm

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