X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 30 Jun 2011 15:06:20 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-kukur.atl.sa.earthlink.net ([209.86.89.65] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTP id 5038368 for lml@lancaironline.net; Thu, 30 Jun 2011 10:42:10 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.65; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=bVTDn7Kf/Fv/Cuf9UsrD3XM6fmNUCb7H4VtUchYKDqzF9mILbFQ2lpau1t+MUQO0; h=Received:From:Mime-Version:Content-Type:Subject:Date:In-Reply-To:To:References:Message-Id:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [64.223.166.158] (helo=[192.168.1.24]) by elasmtp-kukur.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1QcIQy-00069q-I1 for lml@lancaironline.net; Thu, 30 Jun 2011 10:41:36 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1082) Content-Type: multipart/alternative; boundary=Apple-Mail-931-425214510 Subject: Re: [LML] Re: Ventral Strakes, do they reduce performance? X-Original-Date: Thu, 30 Jun 2011 10:41:36 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <7E51A3D9-F014-4727-9ED7-7D8D68B6E8D7@earthlink.net> X-Mailer: Apple Mail (2.1082) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940ef8542b0d7368244678dcd676d3c68d5350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 64.223.166.158 --Apple-Mail-931-425214510 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 A possible solution to the tie down ring problem is to leave it place. = A hole in the single strake can provide a way to get the rope through. On Jun 30, 2011, at 7:51 AM, Gary Casey wrote: > I installed the ventral strakes on my ES and as best I could tell they = reduced my cruise speed by about 2 knots (1%). 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 and then timing how long = it took to turn a give angle. I'm satisfied with the performance, but I = think it could have been better with regard to the drag increase. The = strakes are parallel and I'm sure the airflow in that area is not = 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. > Gary Casey > ES #157 >=20 > Hello guys >=20 > Me again, I just had my first lesson with the Lancair 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. >=20 > Now I was looking on the internet and found that Ventral Strakes were = used to fight against those 'yaw' effects. > It suppose to help with turbulence, go-arrounds, full power take offs = as well. >=20 > My very near future plane (we are almost closing ;) is a newer one, so = the tail section was already updated to the latest.=20 >=20 > But looking at my passengers (I fly with 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. >=20 > Does anybody have experience (before and after) with those? And would = you recommend those?=20 >=20 > Thanks =97 Ronald Stevens (Cirrus 1100 hours, Velocity 250 hours, = Lancair 4p student now with 1 hour LOL) --Apple-Mail-931-425214510 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 A possible solution to the tie down ring problem is = to leave it place.  A hole in the single strake can provide a way = to get the rope through.

On Jun 30, 2011, at 7:51 AM, = Gary Casey wrote:

I installed the ventral strakes on my ES and = as best I could tell they reduced my cruise speed by about 2 knots (1%). =  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 and then timing how long it took to turn a give angle. =  I'm satisfied with the performance, but I think it could have been = better with regard to the drag increase.  The strakes are parallel = and I'm sure the airflow in that area is not 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.
Gary = Casey
ES = #157

Hello guys
Me again, I just had my first = lesson with the Lancair 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  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 closing ;) is a newer one, so the tail = section was already updated to the latest. 

But looking = at my passengers (I fly with 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 you recommend those? 
Thanks =97 Ronald Stevens = (Cirrus 1100 hours, Velocity 250 hours, Lancair 4p student now with 1 = hour LOL)