X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [206.46.252.42] (HELO vms042pub.verizon.net) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 938672 for flyrotary@lancaironline.net; Tue, 10 May 2005 10:32:08 -0400 Received: from verizon.net ([71.99.150.193]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IGA0021J3148XQ7@vms042.mailsrvcs.net> for flyrotary@lancaironline.net; Tue, 10 May 2005 09:31:53 -0500 (CDT) Date: Tue, 10 May 2005 10:31:48 -0400 From: Finn Lassen Subject: Re: [FlyRotary] Re: center rotor OFF In-reply-to: To: Rotary motors in aircraft Message-id: <4280C5D4.4050603@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary=------------050409080309040806000607 X-Accept-Language: en-us, en References: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) This is a multi-part message in MIME format. --------------050409080309040806000607 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Hmm... maybe we could use the skins of our metal airplanes as static speakers... Charlie, how do static speakers work anyway? I'd have to carry a High Voltage supply that could do double-duty to keep finger poking onlookers at bay at fly-ins :) Finn Mark R Steitle wrote: > Here is the answer to the muffler problem. Active Noise Control. No > big, heavy, draggy muffler needed. > > > > > > ...Active Noise Control is unique to this vehicle. Active Noise > Control (ANC) uses sound waves generated from the audio speakers to > cancel out any booming noise from the powertrain. The ANC controller > uses a microphone to detect any noise and then generates a signal 180 > degrees out of phase to cancel out the original noise. > > > > > > Mark S. > > > --------------050409080309040806000607 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Hmm... maybe we could use the skins of our metal airplanes as static speakers...
Charlie, how do static speakers work anyway?
I'd have to carry a High Voltage supply that could do double-duty to keep finger poking onlookers at bay at fly-ins :)

Finn

Mark R Steitle wrote:
Message

Here is the answer to the muffler problem.  Active Noise Control.  No big, heavy, draggy muffler needed.   

 

<snip from “Canadian Driver” article>

…Active Noise Control is unique to this vehicle. Active Noise Control (ANC) uses sound waves generated from the audio speakers to cancel out any booming noise from the powertrain. The ANC controller uses a microphone to detect any noise and then generates a signal 180 degrees out of phase to cancel out the original noise.

<snip>

 

Mark S.

 

--------------050409080309040806000607--