Thank you, @jluc14 I assume that the measure in the third, fifth and seventh column is a consumption rate (millilitres of fuel consumed per minute), but what from operating pressure are these numbers derived? Tony
That is a nice table and it made me have the idea of working out the approximate equations using excel. It shows jet dia is nearly proportional to square root of CP. ie double the jet diameter increases CP ~4x which might be useful sometimes. Not too surprising since it is also the difference in area and so rate fuel is supplied. Like Tony I'm also wondering about the mil columns. I expected them to be thousandths of an inch but it doesn't seem to work out... dividing mil by mm gives a result very close to 40 in every case but there are 25.47mm in an inch. What unit is ~40mm?
That is definitely the orifice size in 1/1000th of an inch (the unit is called "mil"). The formula is: x [mm] / 25.4 [mm/inch] * 1000 [mil/inch] = y [mil]. This gives as an example: 25.4 mm / 25.4 mm/inch = 1 inch; 1 inch * 1000 mil/inch = 1000 mil, or: 0.09 mm / 25.4 mm/inch = 0.00354 inch; 0.00354 inch * 1000 mil/inch = 3.54 mil 0.086614 mm / 25.4 mm/inch = 0.00341 inch; 0.00341 inch * 1000 mil/inch = 3.41 mil The 3.41 instead 3.54 on the sheet in the initial post obviously comes from some rounding errors in the mm column. I have done this before and have gained the same results like on the sheet in the initial post, but I don't know whether this is a copy of a table (or this one) that I have uploaded here a few years ago with the stoichiometric calculations for different fuels...
Thanks, @Martin K. I was not familiar with the “mil” as an abbreviation of 1/1000” so my question above is irrelevant. Cheers Tony
