Just one thing to add, and it's not really a "drag" per se.
You are on the deck in a Spit, in a turnfight with a 190a5 as for example as the first fellow mentioned. Now he took a shot, and still has an advantage in angles, but you are slowly winning out and gaining angles. Maybe you are hurt and need to RTB right away, or maybe there are other bad guys around and prolonged contact will make you easy meat. Either way you want to help set up your buddies and get cleared so you can get the hell out of there ASAP! In this situation, you can likely keep turning and you will eventually win. The key if you want to stay defensive and make it easier for a friendly to help, is not to switch directions. If you are in a hard turn to the left and you are winning, your friends will anticipate where you (and hence your enemy) will be when they engage and can set up a shot. If you suddenly change directions, that snapshot they set up to clear you just went away. If they are in an E fighter or have a speed/E advantage, they will not be able or willing to drop into the turnfight easily. You need to make the enemy as predictable as possible to help them setup snapshots and deflection shots.
Now granted, first you have to survive. BUT, if you are in a situation where you are likely to survive for a while and can drag, BE PREDICTABLE!. If you are predictable, then so is your attacker, making it easy for your buddies to set up a snapshot pass to clear you. Of course, this is only going to work so long as you can keep his guns off of you. Survive first, worry about the rest later.
What if he is in guns range and parameters? Then you must evade, which means you can't be predictable! The only way to help get your six cleared if you are in guns defensives is to communicate to your friends what you are doing. This works best with voice coms, where you can say "I'm going to hit a hard break to the right in 3 - 2 - 1 - NOW!" over the radio so your buddies can predict what you will do and when, while you stay alive. It's not a drag really, but it's increasing the enemy's predictability making it easier for friendlies to set up and clear you.