Lots of wise people gave great info in this thread. FWIW, I disagree with a couple of the "top ten survival tips"
The first one, I feel strongly about in disagreement :"Stay above the fight"
If you are above the fight, the highest or nearly highest guy, you are going to garner a lot of attention from the planes below you, and especially to those entering the area from high. A high pony is considered a real threat. This means that you will spend more time defensive than a lower plane, ponies included. I participate in a fight from lower alts than most ponies for this reason. That, and usually I'm too lazy to grab much past even 8k. A defensive pony will have to burn E in evasives and you won't be getting a lot of kills dodging high zoomers.
I tell this to people who fly with me. I "get small"( a bit different than Steve Martin's version). In other words, I have no problem lingering in a fight with high cons around because there are other friendlies above me, making bigger threats and also better targets. A 4k pony appears to be much less a threat than three 8k spixteens. So as the high guys enter a fight, they see other targets of opportunity/threats, and they usually leave me alone. As an additional deterrent, I stay fast enough that killing me would be a PITA. The zoomers are looking for easy kills. Even a very low pony is a big problem to kill if he has speed. On the occasion where a high plane singles me out and persists, I use my speed to pull him away for a 1v1. I don't mind this at all.
Another one I disagree with some: "Don't get low and slow."
Hey, get low and slow if you feel like it. With sharp SA, you can do just fine. Sure a low and slow pony is going to look cherry and thus get some attention but this also means you will be getting in fights and having fun. With even 2k of alt you can build enough speed to be hard to kill/ have plenty of E to fight. Finally, a deck pony may be at a disadvantage, but you can still outfly the other guy! You are going to die plenty... but you'll learn invaluable things along the way.
Here's the three most important things for me:
1) Sharpen your SA.
Most guys are looking for an easy kill. A pony with any speed who is also aware of the threats around him is going to be a real pain to kill. Most people will not bother with you if you are not easy to bag.
2) Learn to shoot.
Long gun solutions burn precious E and drop SA to dangerous levels. "tunnel vision". While everyone will tell you the .50's are lazers (they are), to be an assassin you need to get that quick killing burst in by putting bullets on the target at convergence. If you are saddlling up in a furball, you are an inefficient killer and will undoubtedly be a victim of the pick. Get the shot, kill the bad guy, reset your SA and get back to the hunt quickly.
3) Be aggressive:
Too often I see a pony who is trying to run just fly straight ahead til he is shot down.(or trying some feeble negative E manuever.... or that stupid, near stick stir, up and down elevator dodge. Try this on a vet and you are DEAD)
If you are getting run down, turn around and fight the guy, make him kill you. You'll be surprised at how often you catch people off guard. Remember, they are expecting a toothless runstang. Go after them. You may still die, but you were going to anyway. Even if you get in this fight and can't turn the tables, there's a good chance that your aggression will cause your opponent to make some mistake that will allow you to slip away.
If they are too close to simply reverse 180 and fight then: Everyone who is running you down is going to have the throttle cobbed; they see a runstang in front of them. A simple barrol roll or scissor with the throttle closed some will often cause these guys to wildly over shoot as they are afraid to slow down and let you get away. Force the overshoot then decide whether to fight or simply duck out and leave.
If all you want to do is survive... go ahead and stay above the fight, always in fear of the higher opponent. Do this, and you are just another runstang pilot.
There's no reason why you can't get down and dirty in the 51. Keep a little speed and you will find success and have some fun in the process. You'll die plenty, like I do, but you'll see plenty of action.