X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 30 Jun 2011 07:51:17 -0400 Message-ID: X-Original-Return-Path: Received: from nm19-vm1.bullet.mail.ne1.yahoo.com ([98.138.91.56] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with SMTP id 5038135 for lml@lancaironline.net; Thu, 30 Jun 2011 07:14:30 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.91.56; envelope-from=casey.gary@yahoo.com Received: from [98.138.90.56] by nm19.bullet.mail.ne1.yahoo.com with NNFMP; 30 Jun 2011 11:13:55 -0000 Received: from [98.138.89.254] by tm9.bullet.mail.ne1.yahoo.com with NNFMP; 30 Jun 2011 11:13:55 -0000 Received: from [127.0.0.1] by omp1046.mail.ne1.yahoo.com with NNFMP; 30 Jun 2011 11:13:55 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 221705.64900.bm@omp1046.mail.ne1.yahoo.com Received: (qmail 18236 invoked by uid 60001); 30 Jun 2011 11:13:55 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=1nlXIXqW3kaft1LhCslIPkCNdRjZV/RqwL2Arw2vzUUG8IFzor1yVd2ax7jEb/d9vz1YHW0Wl6Sgmhcbq1TyqQxeW7MgCL4+u+GhhnM3o75RsIwFCGVKFdgXlrOjItaeoZXp4clyZbZCO0eQni7KcBfT40sJWMN7aGRymfl2j4s=; X-YMail-OSG: ms6vxKgVM1mYAoUOdQNIussSjUkSAPI5M6Ec6jbHzuFN8.m J8S0.STjmSiIOb3bd1YUxfl3VAbyrINzfkEaofoQ.l0UhmHKeJn4Prx_YdiT cnVPnUMd3GfQlNhsNPvb74ADjcXIXim5sXGTkP9ocBqnC9P2cVRNxjI.0mee vjK26w2JESrJXMA36yj94Xt5QZLZsd_9Vf0aZFYlh7eB0A4WPFoQU4.1YKvW c6RwsqevCJDuHchM1V3MTlAxoQGEmsxHWohb7N5Caz4iY8y7ZtzvIDUACzLG jEsiBqP6cKETfcaJ4WCfoqUvvaOZe._d21wQn0ZjKjIkOoKcCJ2bILlBpYWz ..g0owEL35zkUTmtdCMut93qxzNc- Received: from [97.122.158.199] by web125608.mail.ne1.yahoo.com via HTTP; Thu, 30 Jun 2011 04:13:54 PDT X-Mailer: YahooMailRC/572 YahooMailWebService/0.8.112.307740 References: X-Original-Message-ID: <1309432434.16590.YahooMailRC@web125608.mail.ne1.yahoo.com> X-Original-Date: Thu, 30 Jun 2011 04:13:54 -0700 (PDT) From: Gary Casey Subject: Re: Ventral Strakes, do they reduce performance? X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1210433301-1309432434=:16590" --0-1210433301-1309432434=:16590 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable I installed the ventral strakes on my ES and as best I could tell they redu= ced =0Amy cruise speed by about 2 knots (1%). I'm sure it was no more than= that, but =0Acould have been less. I also tested lateral stability and fo= und(feet off the =0Apedals) it increased 30%. I did this by using ailerons= only to put it into a =0Afixed bank angle and then timing how long it took= to turn a give angle. I'm =0Asatisfied with the performance, but I think = it could have been better with =0Aregard to the drag increase. The strakes= are parallel and I'm sure the airflow =0Ain that area is not parallel. I = think that is what causes the "excessive" drag. =0A I thought about buildin= g my own single ventral fin, but the tie-down anchor is =0Aright where the = fin needs to be.=0AGary Casey=0AES #157=0A=0AHello guys=0A=0AMe again, I ju= st had my first lesson with the Lancair 4p (with JC) and when I =0Atook off= the plane was wiggling its tail like a happy dog LOL Nothing scary, but = =0Athis I can imagine could be annoying for passengers.=0A=0ANow I was look= ing on the internet and found that Ventral Strakes were used to =0Afight a= gainst those 'yaw' effects.=0AIt suppose to help with turbulence, go-arroun= ds, full power take offs as well.=0A=0AMy very near future plane (we are al= most closing ;) is a newer one, so the tail =0Asection was already updated = to the latest. =0A=0ABut looking at my passengers (I fly with my Son and Gi= rlfriend a lot) this could =0Abe disturbing for them and I was already thin= king of installing the Yaw damper =0A(I have the tru-trak sorcerer) and per= haps also installing those Ventral =0Astrakes.=0A=0ADoes anybody have exper= ience (before and after) with those? And would you =0Arecommend those? =0A= =0AThanks =E2=80=94 Ronald Stevens (Cirrus 1100 hours, Velocity 250 hours, = Lancair 4p =0Astudent now with 1 hour LOL) --0-1210433301-1309432434=:16590 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
I installed the ventral strakes on my ES and as= best I could tell they reduced my cruise speed by about 2 knots (1%). &nbs= p;I'm sure it was no more than that, but could have been less.  I also= tested lateral stability and found(feet off the pedals) it increased 30%. =  I did this by using ailerons only to put it into a fixed bank angle a= nd then timing how long it took to turn a give angle.  I'm satisfied w= ith the performance, but I think it could have been better with regard to t= he drag increase.  The strakes are parallel and I'm sure the airflow in that area is no= t parallel.  I think that is what causes the "excessive" drag.  I= thought about building my own single ventral fin, but the tie-down anchor = is right where the fin needs to be.
<= font class=3D"Apple-style-span" face=3D"arial, helvetica, sans-serif" size= =3D"3">Gary Casey
ES #157
Hello guy= s

Me again, I just had my first lesson with the La= ncair 4p (with JC) and when I took off the plane was wiggling its tail like a happy dog LOL Nothing scary, but this I= can imagine could be annoying for passengers.

Now= I was looking on the internet and found that Ventral Strakes&= nbsp; were used to fight against those 'yaw' effects.
It suppose to help with turbulence, go-arrounds, full power take offs as= well.

My very near future plane (we are almost cl= osing ;) is a newer one, so the tail section was already updated to the lat= est. 

But looking at my passengers (I fly wit= h my Son and Girlfriend a lot) this could be disturbing for them and I was = already thinking of installing the Yaw damper (I have the tru-trak sorcerer= ) and perhaps also installing those Ventral strakes.

Does anybody have experience (before and after) with those? And would yo= u recommend those? 

Thanks =E2=80=94 Ronald Stevens (Cirrus 1100 hours, Velocity 250 hours, Lancair 4p student now wit= h 1 hour LOL)
=0A=0A=0A --0-1210433301-1309432434=:16590--