X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 29 Jun 2011 07:34:46 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-galgo.atl.sa.earthlink.net ([209.86.89.61] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTP id 5036379 for lml@lancaironline.net; Tue, 28 Jun 2011 22:08:21 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.61; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=GWqW1aU4V5I5PtQHNZuP70BAF/qpFggPnIvb/JwnXDp35irV+hq6+Qnx1daGUL26; 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-galgo.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1QbkBu-0008LV-G8 for lml@lancaironline.net; Tue, 28 Jun 2011 22:07:46 -0400 From: Colyn Case Mime-Version: 1.0 (Apple Message framework v1082) Content-Type: multipart/alternative; boundary=Apple-Mail-888-293584379 Subject: Re: [LML] Ventral Strakes, do they reduce performance? X-Original-Date: Tue, 28 Jun 2011 22:07:46 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: X-Mailer: Apple Mail (2.1082) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940adddad38d027ccd1f40a92fd05b6aca9350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 64.223.166.158 --Apple-Mail-888-293584379 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Ronald, I had the Mike Custard ventrals and I have to say the plane was quite = stable in yaw. e.g. better than a Mooney Rocket. However, I also flew N409L in training which is a straight IV and didn't = notice any big problem with yaw stability. That said, I road in another IVP back seat on a bumpy (thermals ) day = and didn't like the ride at all. Not sure if it was the pilot or the airplane. I am unable to say if the Mike Custard ventrals add a lot more drag as I = never flew my plane without them. You might want to get some = aerodynamic analysis if you go that route. Mike's fins were definitely = designed to solve a real problem with the turbines so if an argument = could be made that ventrals have any use on a piston it could probably = also be made that those big dual fins are overkill. I think I agree with Bob that you don't need a ventral fin for cruise = comfort. My interest in them was somewhat speculative and in relation to stalls. = The thought was that the vstab is largely blanketed by the wing at high = angles of attack so that a ventral fin might be more effective for = avoiding a yaw departure. I will probably never know the answer to = that but I will note that the Columbia 400 has a ventral fin. As far as the yaw damper goes. I have a Sorcerer with the yaw damper. = So far i haven't got it do anything useful in turbulence. I'm still = working with Tru-Trak on that. Colyn On Jun 27, 2011, at 7:34 AM, RONALD STEVENS wrote: > 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-888-293584379 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252
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)

= --Apple-Mail-888-293584379--