Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Mon, 24 Jan 2005 23:16:31 -0500 Message-ID: X-Original-Return-Path: Received: from wind.imbris.com ([216.18.130.7] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP-TLS id 620500 for lml@lancaironline.net; Mon, 24 Jan 2005 22:34:09 -0500 Received-SPF: none receiver=logan.com; client-ip=216.18.130.7; envelope-from=brent@regandesigns.com Received: from [192.168.1.100] (wireless-216-18-135-19.imbris.com [216.18.135.19]) (authenticated bits=0) by wind.imbris.com (8.12.11/8.12.11) with ESMTP id j0P3XbdO064634 for ; Mon, 24 Jan 2005 19:33:37 -0800 (PST) (envelope-from brent@regandesigns.com) X-Original-Message-ID: <41F5BE0C.4020900@regandesigns.com> Disposition-Notification-To: Brent Regan X-Original-Date: Mon, 24 Jan 2005 19:33:32 -0800 From: Brent Regan User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 X-Original-To: Lancair Subject: Re: Alert. NACA 64212 Content-Type: multipart/alternative; boundary="------------060502020804080708030602" This is a multi-part message in MIME format. --------------060502020804080708030602 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Interesting observation! Questions for Roberto. Since the IV has a blended wing, the tip section is only the tip section at the tip. As soon as you get away from the tip the section changes, and one would think the aerodynamic properties. The wing tip does not perform per the plots due to end effects (vortex generation etc.). Do you have any data or information about mid-span properties? The non linearity you point out seems to only happen at a Reynolds number of 3 E6. Does this correlate to the applicable flight parameters? Is this lift coefficient hysteresis characteristic of some, many, all laminar sections? As the section "thins" in the family 64-X12 the effect you point out becomes more pronounced. Do you think that manufacturing variances could reduce or exacerbate the effect? What effect would the various winglet designs have? Inquiring minds want to know. Regards Brent Regan --------------060502020804080708030602 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Interesting observation!
Questions for Roberto.

Since the IV has a blended wing, the tip section is only the tip section at the tip. As soon as you get away from the tip the section changes, and one would think the aerodynamic properties. The wing tip does not perform per the plots due to end effects (vortex generation etc.). Do you have any data or information about mid-span properties?

The non linearity you point out seems to only happen at a Reynolds number of 3 E6. Does this correlate to the applicable flight parameters?

Is this lift coefficient hysteresis characteristic of some, many, all laminar sections?

As the section "thins" in the family 64-X12 the effect you point out becomes more pronounced. Do you think that manufacturing variances could reduce or exacerbate the effect?

What effect would the various winglet designs have?

Inquiring minds want to know.

Regards
Brent Regan
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