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I've been browsing Encyclopedia Astronautica, specifically looking at LOX/LH2 engines and am curious about the mix ratios.

Looking at the Ottobrunn lox/lh2 rocket engine, the Vulcain2 for example, the Oxidizer to Fuel Ratio: 6.7.

The Pratt and Whitney Cobra has a Oxidizer to Fuel Ratio: 6.

The Ottobrunn HM-7-A has an Oxidizer to Fuel Ratio: 5.15

Is the difference in these ratios based on the engines themselves? In other words, does the HM-7-A use less LOX than the Vulcain2 because the latter's engine is more efficient at burning the mixture?

And does anyone have any links for calculating both LH2 and LOX mass per m^3 handy?

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Found the answer to the second part of my question here http://www.orbiter-forum.com/showthread.php?t=23809

Looking at the Ottobrunn lox/lh2 rocket engine, the Vulcain2 for example, the Oxidizer to Fuel Ratio: 6.7.

The Pratt and Whitney Cobra has a Oxidizer to Fuel Ratio: 6.

The Ottobrunn HM-7-A has an Oxidizer to Fuel Ratio: 5.15

Is the difference in these ratios based on the engines themselves? In other words, does the HM-7-A use less LOX than the Vulcain2 because the latter's engine is more efficient at burning the mixture?

And does anyone have any links for calculating both LH2 and LOX mass per m^3 handy?

-----------------------------------------------------------------------------------

Found the answer to the second part of my question here http://www.orbiter-forum.com/showthread.php?t=23809

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