If you fly a 190 or 109(except G6, that is slow as hell) having somebody on your 6 in gunrange means you f***ed up pretty bad. Stay high, stay fast and do not let enemy get on your in gunrange. Utilise your shallow climb rate and you should be OK.
Now, if you are already in this situation, learning how to properly execute scissors is crucial to surviving this encounter. Working with flaps, throttle, elevator trim and most importantly, utilizing your P:W ratio is crucial as well. My advice is: Go to Berloga, hop into the G6, prepare to be handed your ass on silver plate and enjoy close quarter knife fights. Be careful, since most reds can helicopter on you like AH-64D. I will post few tips below.
Rule of the thumb is: The later 109, the less turning you want to do and the more vertical you want to fight. Later 109s require a lot more discipline as well. Lose discipline, you die, stay disciplined, club every enemy in sight. Utilise your power:weight ratio. Dont forget that speed is your friend. Heavy engine torque as well, it can be used to do some sick maneuvers that enemy cannot follow. Tail slip for example.
For dive use -85% to -95%
For cruise use -75%
For maneuver fights around 450kph IAS use -55%
For stallfight use -10%, that thing turns like crazy
5% for light turning
10% for continuous turning
15% up to 25% for slow speed maneuver fight - care, here you are really slow and even though flaps generate some lift, they are draggy as hell
35% up to 55% for hammerheads etc. basically for any maneuver that consists of prophang
basically the same as with F-4. However I recommend staying as fast as possible, because this plane is not that nimble and lacks automatic WEP. It has manual WEP where you can overrev your engine to maximum of 2800RPM using manual pitch and it will last you around 3 minutes. It gives really great power boost. It has better E retention though. I personally like it more.
Dont own, dont know, I guess similar to earlier, except it has WEP so it can do tighter turn when in close quarter knife fight.
The ultimate teacher of E fighting. Do you want to know how to conserve your energy? Fly this plane. Do you want to know how to work with drag of your airframe? Use this plane. Do you want to be frustrated as hell and emerge victorious? Use this plane. It is slower than G2, climbs a tad worse, maneuvers a tad worse. But man, when you start consistently shooting down LA5FNs and Mk IXs, man that feeling is addictive. After you master G6. You will be unbeatable in any other 109. You do not want to use that much flaps, because of the drag and it's weak engine. Learn how to fight in G6 and you will learn how to fight in every energy fighter, including 190s, Ponys, Jugs etc.
G6 on steroids. More nimble, faster, better climber. Stay below 5km, your engine chokes above that quickly.
The ultimate high alt 109. It is heavy as hell, but that power! Use left hand turns to use that heavy torque, roll counterclockwise, abuse your insane power:weight ratio. After flying G6 that plane feels like a homesick angel who wants to get home. Care though, Spitfire Mk. IX can and will outclimb you in low IAS climbs. Stay fast, use your status of fastest aircraft ingame. That mk108 is deadly as well. Hard to aim, but man, when you hit, they evaporate. I love that plane.