[lpmcgrath]

hi, driving my UP today I noticed that when I roll the window down by about 1/3 there is a sound - its like a fluttering sound, as if there was a piece of paper stuck in the window. I've checked and there isn't anything stuck. The sound isn't there when it's only open a little or when it's about about 2/3 but it seems the 1/3 opening is the trigger for this noise!Anyone else experienced this?

 

[spud]

I will try this tomorrow and post my finding

What speed was this at or is it all speeds?

 

[lpmcgrath]

Hi, think I was going about 60 but it seemed to be at anything over 40 to be honest.

 

[vwild1]

My seat belts whistle when all the glass is wide open, maybe your fluttering noise is coming from them as well.

http://www.upownersclub.co.uk/forum/whistling-seat-belts_topic1259.html

 

[Collas]

It could be the seat belt vibrating in sympathy with the wind flowing over it.

Nick

 

[Privatedoc]

Its resonance, bit like blowing over an empty bottle....the car is sealed except for the window opening....simple solution is just a tiny bit open on the other window and it will stop.

often happens with sunroofs etc ...looks like you found the right sized opening to set this up....fluttering feeling/sound is due to setting up a pressure standing wave (for our physics friends) just vent the chamber (ie other window and it will magically go away.

 

[lpmcgrath]

Thanks folks! I thought I was imagining it and it was driving me mad!!