WHY

@echo off
for /f "tokens=3" %%i in ('sed -n "/ROTOT.*ROTORMASS/{n;p;n;n;n;p}" a.txt') do (
    for /f %%j in ('mshta "javaScript:new ActiveXObject('Scripting.FileSystemObject').GetStandardStream(1).Write(4*65*%%i/15);close()"') do echo;%%j
)
pause
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gawk "{if(a){++n; if(n==1||n==4)printf \"%%0.6f\n\",4*6500*$3/1500}}; /ROTOT.*ROTORMASS/{a=1}" a.txt
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PowerShell "type a.txt|select-String 'ROTOT.*ROTORMASS' -Context 4|%%{$_.Context.PostContext[0,3]|%%{4*6500*($_.trim() -split '\s+')[2]/1500}}"
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