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Teardrop: If its a left turn pattern, add 30 degrees to the outbound heading. Right pattern, subtract 30 degrees from the outbound heading. Once you've flown your 30 degree offset for one minute, remember it'll always be a turn back in the direction of the hold (to intercept the inboud course/radial).
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A good acronym for this is LARS: Left Add Right Subtract
I used to know a trick that involved holding a pencil up to the DG or something but honestly it's pretty easy to just draw the hold real quick on your notepad, look at your current heading and figure it out from there. Once you know what you're going to do, repeat the steps in your head a couple times as you approach the fix. "Left 300, outbound 1 minute, inbound 020..."
Another great trick for holds is the 'Plus 2, minus 2' rule. If you take any heading, for example 090, you can figure out it's reciprocal by either adding or subtracting 2 to the first number and doing the opposite of it to the second number. 090 is (0+2, 9-2) 270. 245 is 065 (2-2, 4+2). Leave the third number alone. The trick is to do what keeps the heading below 360. So since adding 2 to the first number in 245 makes it a 4, you instead subtract 2 to make it 0. Then always do the opposite to the second number, so you never add-add or subtract-subtract. Sounds complicated but if you're good at mental math it's pretty quick once you know what you're doing. Hope that makes sense.