Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Thu, 31 Mar 2005 16:49:06 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d20.mx.aol.com ([205.188.139.136] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 850534 for lml@lancaironline.net; Thu, 31 Mar 2005 15:49:05 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.139.136; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d20.mx.aol.com (mail_out_v37_r5.33.) id q.15.41dc681c (16633) for ; Thu, 31 Mar 2005 15:48:12 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <15.41dc681c.2f7dbc0c@aol.com> X-Original-Date: Thu, 31 Mar 2005 15:48:12 EST Subject: The Iceman cometh (down gently) X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1112302092" X-Mailer: 9.0 Security Edition for Windows sub 5000 -------------------------------1112302092 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en Bill =E2=80=9CIceman=E2=80=9D Harrelson, et al:=20 Whilst on the road with the wife and dog (retired, but on vacation?) I got=20= a=20 chance to think a lot about your heavy duty ice experience and those=20 mentioned by others. In the case of the devil=E2=80=99s horn, I can see wh= ere any wing=20 would not only see a tremendous increase in drag but also loss of lift beca= use of=20 the severe disruption of the flow over the wing (and the empennage also). =20= So =E2=80=A6..=20 1. Do you think that the freezing rain contained super-cooled large=20 droplets? I understand this to be the worst and almost impossible to creat= e in=20 flight tests. 1. Do you think that Lancair=E2=80=99s being equipped with excess powe= r (more=20 than minimally required in STC=E2=80=99d aircraft) contributed to the succe= ssful=20 outcome? 1. Could you report on the tail plane icing? I read the story of the=20= =20 prolonged climb with the ice locking control surfaces on the IV =E2=80=93 Ic= e buildup =20 on the under surfaces, too? I have been concerned about the tail because o= f=20 the sharp leading edges and the potential for building ice first. 4. What did the plane feel like with the initial partial extension of= =20 the flaps =E2=80=93 pitch=20 and controllability?=20 Now for the poser. This only pertains to Lancair 235/320/360s and their=20 special wings with reflexed flaps=E2=80=A6=E2=80=A6=E2=80=A6. =20 We know that these wings have certain characteristics with the flap at zero= =20 degrees. The reflex position (-7 degrees) is utilized to reduce lift and=20 drag with a change in the center of lift causing a nose up pitch (AOA chang= e=20 too). This is inherent in the design. =20 So, when slowed down by carrying ice would it be better to return the flaps= =20 to the zero degree position in order to lower the nose, reduce the angle of= =20 attack and increase the lift? =20 Scott Krueger -------------------------------1112302092 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en

Bill =E2=80=9CIceman=E2=80=9D=20= Harrelson, et=20 al:

Whilst on the road with the wi= fe and=20 dog (retired, but on vacation?) I got a chance to think a lot about your hea= vy=20 duty ice experience and those mentioned by others. In the case of the devil=E2=80=99s= horn, I can=20 see where any wing would not only see a tremendous increase in drag but also= =20 loss of lift because of the severe disruption of the flow over the wing (and= the=20 empennage also). =20 So=E2=80=A6..

Do you think that the freezi= ng=20 rain contained super-cooled large droplets? I understand this to be the wors= t and=20 almost impossible to create in flight tests.

Do you think that Lancair= =E2=80=99s being=20 equipped with excess power (more than minimally required in STC=E2=80=99d=20= aircraft)=20 contributed to the successful outcome?

Could you report on the tail= plane=20 icing? I read the story of=20= the=20 prolonged climb with the ice locking control surfaces on the IV =E2=80=93=20= Ice buildup=20 on the under surfaces, too? I=20 have been concerned about the tail because of the sharp leading edges and=20= the=20 potential for building ice first.

=20 4. What did the plane feel like with the initial partial extension of=20= the=20 flaps =E2=80=93 pitch

= =20 and controllability?

Now for the poser. This only pertains to Lancair=20 235/320/360s and their special wings with reflexed flaps=E2=80=A6=E2=80=A6= =E2=80=A6.=20

We know that these wings have=20 certain characteristics with the flap at zero degrees. The reflex position (-7 degrees) i= s=20 utilized to reduce lift and drag with a change in the center of lift causing= a=20 nose up pitch (AOA change too). =20 This is inherent in the design.

So, when slowed down by carryi= ng ice=20 would it be better to return the flaps to the zero degree position in order=20= to=20 lower the nose, reduce the angle of attack and increase the lift?

Scott=20 Krueger

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