For as long as I can remember - (and it's a very long time) - the cracking whip effect was always in the stereo mix.
You might be right, I don't have a stereo copy to confirm. I do remember hearing the stereo version a lot as my brother used to play it and "Wings" all the time in his car and don't recall any whip effect. If the effect is there it must be subtle, buried in the mix. Can someone with a stereo copy confirm? In any case the stereo mix's are very dry and boring compared to the Quad.