Same principle is used in SAAB Turbo - not cars - Prop Aircraft cabins.
----- Original Message -----
From: "Lincoln Yeo" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, 23 February 2001 12:13 PM
Subject: Re: exhaust noises
> yeah, ive heard of a similar principle (i saw it on beyond 2000)
> - basically it works by um... ok imagine the noise a helicopter
> makes - sort of whup whup whup etc - well basically i think it
> works by adding a whup inbetween the other whups, and it turns
> out u cant hear a constant whup because it is actually a pulse -
> so u end up with little sound...
>
> Linc
>
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