This is not a whine.
Many who read this post may already know what I am talking about. If so, no need to tell the world that you already know - keep the reply #s down please so informative replies are not lost in 'clutter' and cannot be seen by the (new, newer) people who could learn something by reading this thread.
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So you are on the deck (~100' altitude), kind of slow (~250 MPH), being forced to use evasive maneuvers vs. an enemy who is 500-650 away from you and firing in short, well aimed bursts. Behind that enemy are 3 other enemy aircraft who are flying straight and level and heading for you at max. power. (For realisms/simplicitys sake) We'll say that we are in the MA and you and all 4 bad guys are flying Spitfire IXs. 8)
4000' above you, diving towards you at high speed from your high '3', is a friendly Fw 190D-9. There are numerous other bad guys around also, all at about 6000' altitude and within visual range your side is outnumbered roughly 2:1.
The Fw 190 gives you an 'auto check 6 call' (duh), then you get a message on 'channel 3'. "xxxxxx im otw drag" (with 'xxxxxx' = your handle).
When that Fw 190D-9 gets to about 2.0 from you, at your not so high '3' anymore, turn to your '9' and enter a shallow dive. If you use evasives make them very very slight. Your heading should not change more than 5 degrees at a time. No excessive roll.
Remember this: any evasive maneuver you make is going to be mirrored by the bad guy 600 behind you. If you can keep your speed up and your course roughly the same, the closest bad guy is going to get shot down and you will be at around 300 MPH (so the next 3 bad guys coming will have a reduced rate of closure) when that nearest bad guy explodes.
If that bad guy doesn't explode, it's because he made a 'break turn' to avoid being shot, and you now have some good separation.
Better yet, if that Fw 190D-9 (or P-51, or La, or F4U, or P-47) didn't have to use alot of elevator input on the gun pass and/or the kill, he still has alot of speed. He's probably looping, doing a half roll at the top of the loop to look for the biggest threat and/or line up the congo line of 3 closing bad guy Spitfire IXs, so he can drop in behind them as they try to chase you and make them make a decision - continue chasing you and get shot at, or break off the chase and don't get shot at.
The cliff notes version - if someone is coming to help you and they are very fast, don't perform an evasive maneuver (e.g. break turn, split s, etc.) that will force them to maneuver heavily to get set up a gun pass on the enemy who is shooting at/chasing you. Maneuver to put the enemy behind you flying with his bellybutton towards your potential saviour, flying in a straight line with roughly the same heading as your potential savior.
'FYI'.
Mike/wulfie