Here are my numbers, please someone confirm their accuracy.
Assume base speed = 25, then speed cap = 25 * 1.7 = 42 Yammy cap = 40
Total Engy Ability needed for number of engies vs speed speed engy2 engy3 engy4 engy5 engy6 38knots 6.61 mm 8.10 mm 9.35 mm 10.46mm 11.45mm 39knots 7.63 mm 9.35 mm 10.79mm 12.07mm 13.22mm 40knots 8.65 mm 10.59mm 12.23mm 13.68mm 14.98mm 41knots 9.67 mm 11.84mm 13.67mm 15.29mm 16.75mm 42knots 10.69mm 13.09mm 15.11mm 16.90mm 18.51mm
And given the table of Total Engy Ability, here is the overheat time you would have: # of engies engy2 engy3 engy4 engy5 engy6 38 60secs 74secs 85secs 95secs 104secs 39 69secs 85secs 98secs 110secs 120secs 40 79secs 96secs 111secs 124secs 136secs 41 88secs 108secs 124secs 139secs 152secs 42 97secs 119secs 137secs 154secs 168secs
**edits: Added OH time table
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