Also the trainers are in relative high demand. If you can't manage to pin down a time with one, you can also work with experienced pilots who spend time in the training room. There are a handful of relatively experienced flyer's who spend a decent amount of time in the training room sharing what they know, and generally just relaxing.
If you have found a plane you really feel you would like to learn, try asking in general if anyone is decent with that plane and wouldn't mind showing you a bit. Simply talk with the crowd in the TA can sometimes buy you a lot of useful information. (Not always as much useful information during the summer.
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I suggest asking around in there to get some one on one time with one of these experienced flyer's, then later on when none of them are around get in some one on one time with another new pilot closer to your level to see if you can get what you learned to work on them.
for instance say one day you are practicing with a vet nd he shows you a good angle for performing a good break turn, or split-ess. Later on when you're working with another new pilot see if you can get it to work against them. Share the knowledge though. You'll find that you really have something down when you're able to teach it to someone else.
Just the process of
trying to teach it to someone else will help you improve. As you go through and explain it, you tend to figure out just which aspect of it you yourself were doing wrong.
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My advice though will vary. shaking someone from your 6 has a lot to do with what you're flying and what they're flying, as well as how much air you have under you to work with, and the closure rate of the two aircraft. It's a lot easier to shake someone at 20,000 feet than it is at 2,000 feet.
I can't really think of one clean piece of advice that will work in all cases other than don't let them saddle up on your 6 in the first place. That may sound overly simplified but it's true. You need to be aware of your planes strength and weaknesses and avoid situation which will get you into trouble.
For example, if you're flying a high speed energy plane like a P51, or 109, you don't get into tight low altitude slow speed turn fights with planes like Spitfires, Yak's or A6M's. If you're in a poor climber like the A6M don't chase a BnZ plane into the vert after you jink and they zoom past you. These are very easy and simple ways to get dead fast. And as a new pilot you won't always know why you just ended up dead.