X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 03 Aug 2008 14:48:03 -0400 Message-ID: X-Original-Return-Path: Received: from mta10.adelphia.net ([68.168.78.202] verified) by logan.com (CommuniGate Pro SMTP 5.2.5) with ESMTP id 3053845 for lml@lancaironline.net; Sun, 03 Aug 2008 09:35:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.202; envelope-from=glcasey@adelphia.net Received: from [75.83.27.99] by mta10.adelphia.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20080803133909.YIFH20419.mta10.adelphia.net@[75.83.27.99]> for ; Sun, 3 Aug 2008 09:39:09 -0400 Mime-Version: 1.0 (Apple Message framework v753) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-11--1054851093 X-Original-Message-Id: From: Gary Casey Subject: Re: Lancair IV Strakes X-Original-Date: Sun, 3 Aug 2008 06:35:17 -0700 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.753) --Apple-Mail-11--1054851093 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes; format=flowed I performed some back-to-back tests on my ES after getting some =20 feedback from a professional test pilot. He said that the strakes(as =20= far as I know there is only one commercial source for these at the =20 moment) were "necessary" on the IVPT, "important" on the IVP and =20 "made an improvement" on the ES. I found that directional stability=20 (feet on the floor, so the rudder was free to weathervane) was =20 improved about 30%. There was an increase in the yaw natural =20 frequency and an increase in the yaw damping, both by about that =20 amount. After an aileron roll input it was also about 30% faster to =20 enter a stabilized turn. It was good enough for me to install them, =20 although there was about a 2-knot drop in speed, excessive in my =20 opinion - strakes like that should not measurable affect drag. I =20 think the problem is in the "toe-in" of the strakes. They are =20 geometrically parallel, but not with respect to the direction of =20 airflow, where they are actually toed in. Take a look at the strakes =20= on Lears or Piaggios and you can see the difference. Anyway, the =20 parts from Mike Custard were of very high quality, they worked and =20 I'm satisfied, but if I were doing it again I'd probably design my own. Gary Casey ES #157 > Following completion of my engine conversion from an IO550 to a =20 > turbine, my Lancair IV behaved very badly after take offs. The =20 > tail would be all over the place from lift off to approximately =20 > 500=92. Even with extra special attention being paid to the rudder =20= > pedals, I could not get even close to comfortable with control of =20 > the airplane. After doing some research and talking to other =20 > turbine pilots I added Mike Custard=92s strake. To say it was an =20 > improvement would be a serious understatement. The airplane =20 > behaves very well in all phases of flight. I strongly recommend it. > > > Berni > > > > I'm looking to contact Mike Custard regarding his ventral strakes =20 > for the Lancair IV. > > After readng an article from Bill Hogarty regarding a more gentle =20 > stall and better control at slow speeds prior to landing. > > Michael Giardino > > n66mg --Apple-Mail-11--1054851093 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=WINDOWS-1252 I performed some back-to-back tests on my ES after getting some feedback = from a professional test pilot. =A0He said that the strakes(as far as I = know there is only one commercial source for these at the moment) were = "necessary" on the IVPT, "important" on the IVP and "made an = improvement" on the ES. =A0I found that directional stability(feet on = the floor, so the rudder was free to weathervane) was improved about = 30%. =A0There was an increase in the yaw natural frequency and an = increase in the yaw damping, both by about that amount. =A0After an = aileron roll input it was also about 30% faster to enter a stabilized = turn. =A0It was good enough for me to install them, although there was = about a 2-knot drop in speed, excessive in my opinion - strakes like = that should not measurable affect drag. =A0I think the problem is in the = "toe-in" of the strakes. =A0They are geometrically parallel, but not = with respect to the direction of airflow, where they are actually toed = in. =A0Take a look at the strakes on Lears or Piaggios and you can see = the difference. =A0Anyway, the parts from Mike Custard were of very high = quality, they worked and I'm satisfied, but if I were doing it again I'd = probably design my own.

Gary Casey
ES = #157
Following completion of my = engine conversion from an IO550 to a turbine, my Lancair IV behaved very = badly after take offs.=A0 The tail would be all over the place from lift = off to approximately 500=92.=A0 Even with extra special attention being = paid to the rudder pedals, I could not get even close to comfortable = with control of the airplane.=A0 After doing some research and talking = to other turbine pilots I added Mike Custard=92s strake.=A0 To say it = was an improvement would be a serious understatement.=A0 The airplane = behaves very well in all phases of flight.=A0 I strongly recommend = it.

=A0

Berni

=


I'm looking to contact Mike = Custard regarding his ventral strakes for the Lancair = IV.

After readng = an article from Bill Hogarty regarding a more gentle stall and=A0better = control at slow speeds prior to landing.

Michael = Giardino

n66mg

<= /o:smarttagtype>
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