# What is the Kerosene/LOX mixture ratio of the Block 5 Falcon 9?

as the title would suggest, does anyone know a calculation or solution to finding the current mixture ratio used on the latest block 5 configuration?

This would be easier if so many people did not post a different result to the same question.

From

Kerosene tank capacity
- First stage  : 123,500 kg
- Second stage : 32,300 kg

Liquid oxygen tank capacity
- First stage  : 287,400 kg
- Second stage : 75,200 kg


I have found

Kerosene : LOX = 3 : 7 (which gives 0.428571) similar but different to below


of

123,500 / 287,400 = 0.429714


Are either of these answers even remotely in the range of current usage possibility? 0.428571 on one side and 0.429714 on the other.

• Where are your data coming from? – Russell Borogove Sep 7 '18 at 23:29
• Also, what are you actually trying to figure out, at a high level, with your recent questions? – Russell Borogove Sep 7 '18 at 23:35
• If you're comparing the ratio to what would be expected by the chemical reactions, keep in mind that the Merlin engines in Falcon 9's are designed to run fuel-rich (i.e. there is a slight excess of fuel). – DrSheldon Sep 8 '18 at 4:32
• Just casually looking through rocket calculation, Russell Borogove. – UndefinedUsername Sep 8 '18 at 7:33