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Wrong Specific Gravity used for MOGAS Mogas 80/90


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rosdol
rosdol
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Hi,

as I noted in another thread (Aircraft Profiles) you calculate the Mogas weight by using 0,75kg/l which is wrong. The acceptable Standard for 80/90 Octane Mogas is 0,72 kg/l. This gives a diffrence of some kg in your W/B calculation.

Can you please correct this in a new release ??

thansk

Erik
Tim Dawson
Tim Dawson
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What is your source reference for this data, please?
ckurz7000
ckurz7000
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Wikipedia lists the density of automotive fuel between 0.71 - 0.77 kg/l. Avgas is 0.68 - 0.72 kg/l. Higher ethanol content raises the density. Higher grade gasoline also tends to be denser. So it is really up to you what you use. I think 0.75 kg/l is not at all unreasonable.

-- Chris.
rosdol
rosdol
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Re Tim,

in most POH's I have read the Mogas or Avgas specific Gravity used for calculating the W/B is 0.72.

Erik
ckurz7000
ckurz7000
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Well, what can I say. It is what it is, whether it's in the POH or not. I think it has legal ramifications, though. When you use the POH value your a** is covered if you use it...whether it's right or not.

-- Chris.
GO

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