Return-Path: Sender: (Marvin Kaye) To: lml Date: Sat, 08 Mar 2003 16:18:25 -0500 Message-ID: X-Original-Return-Path: Received: from mailhost.det2.ameritech.net ([206.141.193.105] verified) by logan.com (CommuniGate Pro SMTP 4.0.6) with ESMTP id 2047013 for lml@lancaironline.net; Sat, 08 Mar 2003 09:00:10 -0500 Received: from dynacomm.ws ([66.72.181.103]) by mailhost.det2.ameritech.net (InterMail vM.4.01.02.17 201-229-119) with ESMTP id <20030308140009.OAXX8853.mailhost.det2.ameritech.net@dynacomm.ws>; Sat, 8 Mar 2003 09:00:09 -0500 X-Original-Date: Sat, 8 Mar 2003 09:00:09 -0500 Subject: Re: Lancair acoustic testing Content-Type: text/plain; charset=ISO-8859-1; format=flowed Mime-Version: 1.0 (Apple Message framework v551) From: Lorn H. Olsen X-Original-To: Lancair List Content-Transfer-Encoding: quoted-printable X-Original-Message-Id: <45D61D00-516E-11D7-BEAF-000393C2C1A6@dynacomm.ws> X-Mailer: Apple Mail (2.551) > From: Scott Krueger , N92EX > . > . > 1. After the soundproofing described later, cruise flight (defined as=20= > 25 inches, 2500 rpm, 180 KIAS, Hartzell 70 inch CS prop) would yield=20= > between 101 and 103 Db (slow response scale, Radio Shack noise meter). > 2. The greater noise reading is obtained by opening the cockpit=20 > cooling vents (air rush plus prop/engine).=A0 These are NACA ducts on=20= > the fuselage sides at about 2 feet aft of the firewall that feed air=20= > at "calf" level and thru an instrument panel "eyeball" vent just in=20 > front of each stick (face air). > 3. The measurements were taken near the pilot's right ear. > 4. For comparison, my 96 Corvette yields a reading of 98 Db at 70 mph=20= > traveling on asphalt pavement with 20,000 miles on the tires and not=20= > counting the screams coming from the passenger. > . > . Scott, Do you have any idea what the Db reading was before the the=20 soundproofing? Could you take a quess? Does anyone else? -- Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp. 248-478-4301, mailto:lorn@dynacomm.ws LNC2, O-320-D1F, N31161, Y47, SE Michigan=