I believe the saran wrap is for engine start-up, (they start the night before and wrap the engine to prepare for this) I guess on the 47 when the saran wrap is ingested into the engine during start up it prevents fod and other junk from being taken in..- Acts kinda like a lubricant and seal all in one, I hear this is quite popular in some countries.
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- do make sure u wer ear plugs since I hear it is quite loud when the paper and metal portion is sucked through the engine (s)