DCT,T/O flap was used on JPs to simulate drag; airbrakes destroy the lift and you resemble a slightly streamlined brick..
Even NACA cant do the maths ..3.5 sq ft gives 56 lib drag /sq.ft ,not 5.6....engine would be about similar to Strikey or Dominie Viper....
LOM,from memory of the Hunter ,210 clean to 3nm on a 1:1,gear,to 175/180, flap about 1.5, then start heaving...as it would be all in manual of course......