X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 15 Aug 2013 08:02:00 -0400 Message-ID: X-Original-Return-Path: Received: from mail-pa0-f53.google.com ([209.85.220.53] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6418546 for lml@lancaironline.net; Wed, 14 Aug 2013 18:52:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.220.53; envelope-from=g.weeks550@gmail.com Received: by mail-pa0-f53.google.com with SMTP id lb1so176403pab.12 for ; Wed, 14 Aug 2013 15:52:06 -0700 (PDT) X-Received: by 10.66.216.129 with SMTP id oq1mr12542511pac.75.1376520726677; Wed, 14 Aug 2013 15:52:06 -0700 (PDT) X-Original-Return-Path: Received: from [192.168.0.7] (184.13.233.220.static.exetel.com.au. [220.233.13.184]) by mx.google.com with ESMTPSA id om2sm52868605pbc.30.2013.08.14.15.52.03 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 14 Aug 2013 15:52:06 -0700 (PDT) Subject: Re: [LML] Wing Cuffs for the Legacy References: From: Gary Weeks Content-Type: multipart/alternative; boundary=Apple-Mail-26D6F7A5-996D-43D4-9352-5431C78E4E72 X-Mailer: iPad Mail (10B329) In-Reply-To: X-Original-Message-Id: <57DC858D-4304-49EA-B2CE-84DBD61950FE@gmail.com> X-Original-Date: Thu, 15 Aug 2013 08:52:00 +1000 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-26D6F7A5-996D-43D4-9352-5431C78E4E72 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Hi Stan, I have flown the Legacy RG with cuffs and without. The first Legacy RG to be= fitted with the cuffs was I believe John Smiths legacy from Perth in Oz. John and I collected a lot of data from both before and after the fitting of= the wing cuffs, John will have all of that information. We found there was n= o change to high speed performance, no reduction in stall speed but a big ch= ange in the amount of buffet prior to the onset of a stall. The pre stall buffet is very pronounced and evident 2 to 3 knots prior to th= e stall (standard wing buffet happens about 1 knot prior to stall) ailerons a= re effective into the stall and the big selling point from my perspective is= the improved stability and improved roll control on final approach or at lo= w speed in any configuration. The Legacy with cuffs is a lot more solid and stable on approach at say 85kt= s than is the standard winged Legacy. I know you guys will say there is no n= eed to fly that slow (1.3 VS) on finals but there are many airports here in O= z that don't have the luxury of huge runways. As my Legacy is flying, and I am comfortable with its handling I don't plan o= n fitting cuffs. However if I was in the build stage still, I would go ahead= and install the cuffs.=20 The Legacy wing is a beautiful wing, but I must admit the low speed handling= characteristics of an already good wing are improved with the cuffs. They d= o not effect high speed numbers and I think having that little bit extra win= g may also improve high altitude handling. That's my two bobs worth. Gary Weeks Legacy RG #205 Sent from my iPad On 14/08/2013, at 5:49 AM, "Stan Fields" wrote: > I am still building my Legacy but the wings are finished and in primer. N= ow Lancair has introduced a new product to add cuff airfoils to the outboard= section of the wings. http://www.lancair.com/index.php/latest-news/335-lega= cy-cuffs > =20 > This "upgrade" addresses several of the Legacy's short comings voiced on L= ML: better roll control, reduced stall speed and enhanced stall warning buff= et, all without effecting the top speed. New Legacy kits will include the Cu= ffs at no extra charge but as an upgrade the cuffs cost $1495. > =20 > Has anyone flown a cuffed wing aircraft? How may Legacy drivers would spri= ng for the Cuff Upgrade to improve their Legacy's slow speed performance? If= new Legacy kits come with the cuffs shouldn't I buy the upgrade just to pre= vent my Legacy from being a "classic" before it's ever built? > =20 > Stan Fields > Legacy Kit 201 > Austin > =20 --Apple-Mail-26D6F7A5-996D-43D4-9352-5431C78E4E72 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Stan,

I ha= ve flown the Legacy RG with cuffs and without. The first Legacy RG to be fit= ted with the cuffs was I believe John Smiths legacy from Perth in Oz.
<= div>
John and I collected a lot of data from both before and a= fter the fitting of the wing cuffs, John will have all of that information. W= e found there was no change to high speed performance, no reduction in stall= speed but a big change in the amount of buffet prior to the onset of a stal= l.

The pre stall buffet is very pronounced and evid= ent 2 to 3 knots prior to the stall (standard wing buffet happens about 1 kn= ot prior to stall) ailerons are effective into the stall and the big selling= point from my perspective is the improved stability and improved roll contr= ol on final approach or at low speed in any configuration.

The Legacy with cuffs is a lot more solid and stable on approach at s= ay 85kts than is the standard winged Legacy. I know you guys will say there i= s no need to fly that slow (1.3 VS) on finals but there are many airports he= re in Oz that don't have the luxury of huge runways.

As my Legacy is flying, and I am comfortable with its handling I don't pla= n on fitting cuffs. However if I was in the build stage still, I would go ah= ead and install the cuffs. 

The Legacy wing is= a beautiful wing, but I must admit the low speed handling characteristics o= f an already good wing are improved with the cuffs. They do not effect high s= peed numbers and I think having that little bit extra wing may also improve h= igh altitude handling.

That's my two bobs worth.

Gary Weeks

Legacy RG #205


Sent from my iPad

On 14/08/2013, at 5:49 AM, "= Stan Fields" <sdfields68@att.net> wrote:

I am still building my Legacy but the wings are finished and in pri= mer.  Now Lancair has introduced a new product to add cuff airfoils to t= he outboard section of the wings. http://www.lancair.com/index.php/latest-news= /335-legacy-cuffs

 =

This "upgrade" addresses several of the Legacy's s= hort comings voiced on LML: better roll control, reduced stall speed and enh= anced stall warning buffet, all without effecting the top speed. New Legacy k= its will include the Cuffs at no extra charge but as an upgrade the cuffs co= st $1495.

 

Has anyone flown a cuffed wing aircraft? How may Legacy driv= ers would spring for the Cuff Upgrade to improve their Legacy's slow speed p= erformance? If new Legacy kits come with the cuffs shouldn't I buy the upgra= de just to prevent my Legacy from being a "classic" before it's ever built?<= o:p>

 

Stan Fields

Legacy Kit 201

Austin

 

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