For info Christiaan - Some numbers from 747 engines...
Sorry , these are not metric units.
The dry JT9D-7F is a 48,000 lbs thrust engine, the -7FW (wet) is 50,000 lbs.
I do not have the mass airflow for the above engine.
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For the JT9D-7Q, a 52,500 lbs thrust engine, it is 1,668 lbs/second.
TSFC is indicated as .378...
Fan thrust is 41,000 lbs, core thrust is 11,500 lbs.
Bypass ratio is 4.9 to 1...
And compression ratio is 24.4...
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Hope it helps for your slide rule
Happy contrails