Couple years ago I was flying my Ultra Stick 60 and a piece of covering came loose and started making a whistling noise.
Fellow flyer came over while I was still flying it and asked why it was whistling.well at this time while still flying it I had no idea what
was causing it until I landed and looked it over,so I just said I guess because it does not know the words.
Got some laughs over that one at that time.
Still flying the Ultra Stick 60 but had to replace engine.Had a Thunder Tiger 91 4 stroke on it.Flew it so much I wore the engine out.
I now have a Saito 91 Gold Knight on it.picked it up in Perry from the same guy that asked me why my plane was whistling.