Man ... some good stuff going on here !!!
"My problem is when I'm doing say 300, at 15k, and I have a bogie closing form my 6. I notice him at 3k out, and at the rate of closure he will be in guns range in 5 or 10 seconds.... closing fast enought that Im not going to out run him, but with not such a big differance in speed that I can force an over shot type maneuver as he'll be able to pretty much do what I can at that speed."
MDJ ...
If he is closing a 3K gap in 5 to 10 seconds, then I would think that he has much more speed than you ... IMHO
I have been flying the P-39 alot as of late, and in this situation, yes the Split-S is an option, but I hate to give away alt if not needed. I would have turned into him (much like humble describes) as soon as I sensed the rapid rate of closure.
This would cause him to try to slow down to get a decent guns solution, and if he didn't slow down, as he passed, if the rate of separation is fast, then I would break off the turn and go nose down a little to try to get some E and separation back. Now, he has to turn back to engage. If he is smart, then he zoomed to turn alt back into E and at this point is where you try to continue to equalize the E state using the same "turn into him" technique. If he flat turned, then you are getting to equal ground much sooner than he would like.
If the WT film is the one that I am thinking about (Spit V), all his attackers are faster, but not at a rate of closure of 3K in 5 to 10 seconds. If they were, I don't think that he would get the shot as we see in the film until he HAS equalized speed/E a little more due to their sheer speed at the pass. Although WT can do things that make my eyes go wide open ... hehe.
It's a great film and I have made use of that move many times since watching it ... thanks WT. Also, I have used that same move using the P-38, but again, the E states have to be closer than what MDJ describes before a good solid shot can be had.