I do all my dive bombing from a 0-G dive and its very accurate, you just need to be a good judge of distance and as i stated before where you would crash if you just let go of your stick, thats where your bombs hit.
More cute angles are effective as well but IMO its more difficult.
Also VGhost make sure you cut throttle before starting down, personaly i make sure im going slow before i nose down. Another personal prefernce of mine is to fly inverted over the target to line up before starting to dive. around 3k above the target is where i like to release. closer than that and you can use the aiming point, just make sure that you have your true heading and your not making your plane stay in the aimed posistion buy letting off the stick for a second before you drop. The wind should catch you and hold the proper course.
but dropping that low is dangerous, you can either catch some of the blast or have a hell of a time pulling out.
Good luck VGhost
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