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In a message dated 7/4/2002 5:12:09 PM Central Daylight Time, Newlan2dl@aol.com writes:
Making an aircraft quiet should address three things and in this order:
1. Keep the noise out
2. Absorb the noise that gets in
3. Control and quiet structure born noise coming in.
Dan,
Great post. LNC2s have certain noise problems only solved by ANC headsets.
Re 1 Above - There are two major uncontrollable noise sources - The cockpit ventilation NACA ducts (when open) and the enormous bubble canopy, especially if you have an older kit, one made with an eighth-inch thick material.
Re 2 - The aft face of the firewall is a good candidate for barrier and absorption; the floor carpeting, side panel foam and fabric and seat cushion material do a good job with exhaust noise.
Re 3 - Foam stuffed in the forward D-section of the stub wing holds down the "sound-box" effect of that space.
Everything else needs a good ANC headset.
Scott Krueger
N92EX
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