at what speed do i make circles with the 109?

[Danelov]

Preferably, you aren't having to do sustained turns in the 109. BnZ tactics are more suited to this plane, you'll lose sustained turns to either the Hurri's or Spits.

Exactly, a mistake to avoid in the 109. Dont go never in turn combat with Spitfires or Hurricanes. Slats helps but is not enough and both British fighters gain advantage quickly against the 109.