ENGINE BOOSTS
- Thread starter FLYBOYJ
- Start date
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That row with input for Russian / Japanese seems a bit weird. 103 mm Hg is a reasonable manifold pressure, but 4080 Inches Hg is not.
This seems like the same discussion we had here though your subject makes a lot more sense:
http://www.ww2aircraft.net/forum/engines/ata-inches-hg-26858.html
- Ivan.
This seems like the same discussion we had here though your subject makes a lot more sense:
http://www.ww2aircraft.net/forum/engines/ata-inches-hg-26858.html
- Ivan.
GregP
Major
Hi Guys,
What I sent was an Excel file and the numbers are purely for test purposes. If you start in the first row and insert some value for "Bar" and then go across and enter the first-row value for the rest into the coral border entry area, they all get identical numbers.
For instance, if you put 9.812 Bar into cwll E7, you get (across), 98.124 kPa, 1.01 ata, 0.736 mm Hg, 28.979 in Hg, 10,005 mm H2O, and 14.232 psi boost. If you, in turn, enter those numbers into the coral border cell in the rest of the rows, then all rows match.
Mostly I use the second area anyway since I only came across mm water one time in references. It is sort of unneeded.
Hopefully the Excel file can be posted somehow so you can use it interactively.
If not, send me a PM and I could email it to you.
Best regards, - Greg
What I sent was an Excel file and the numbers are purely for test purposes. If you start in the first row and insert some value for "Bar" and then go across and enter the first-row value for the rest into the coral border entry area, they all get identical numbers.
For instance, if you put 9.812 Bar into cwll E7, you get (across), 98.124 kPa, 1.01 ata, 0.736 mm Hg, 28.979 in Hg, 10,005 mm H2O, and 14.232 psi boost. If you, in turn, enter those numbers into the coral border cell in the rest of the rows, then all rows match.
Mostly I use the second area anyway since I only came across mm water one time in references. It is sort of unneeded.
Hopefully the Excel file can be posted somehow so you can use it interactively.
If not, send me a PM and I could email it to you.
Best regards, - Greg
Thanks for the quick response GregP,
Please do send me a copy of the spreadsheet. My email address is [email protected]
I did a similar spreadsheet a few years back (screenshot in linked thread) and can send that to you also if you send your email address.
BTW, Are Russian boost settings the same as Japanese? I thought they used absolute pressure instead of pressure above STP.
Thanks.
- Ivan.
Please do send me a copy of the spreadsheet. My email address is [email protected]
I did a similar spreadsheet a few years back (screenshot in linked thread) and can send that to you also if you send your email address.
BTW, Are Russian boost settings the same as Japanese? I thought they used absolute pressure instead of pressure above STP.
Thanks.
- Ivan.
- Thread starter
- #6
FLYBOYJ
"THE GREAT GAZOO"
Tried to upload the excel sheet, no joy 
Here is where you can find my spreadsheet online:
Engine Performance Tuning Tutorial
It is called "Engine Boost Calculation" or something like that.
- Ivan.
Engine Performance Tuning Tutorial
It is called "Engine Boost Calculation" or something like that.
- Ivan.
GregP
Major
Hey Ivan ... sent.
FlyboyJ, thanks for trying!
Best regards, - Greg
FlyboyJ, thanks for trying!
Best regards, - Greg
wuzak
Captain
Yes, there are a couple of errors.
On the top line:
1 bar = 100kPa
0.987 atmospheres
750.188 mmHg
29.535 inHg
On the top line:
1 bar = 100kPa
0.987 atmospheres
750.188 mmHg
29.535 inHg
Please do not mistake at with atm. One is the technical atmosphere, 1 at = 0.981 bar, one is the physical atmosphere, 1 atm = 1.013 bar. The boost given for German engines of the time is usually given in technical atmospheres absolute, ata. Pressure given for German tires of the time is usually given in technical atmosphere relative (excess pressure, Überdruck), atü. Only physicists would use atm.
