X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 11 Dec 2013 07:40:54 -0500 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 6.0.7) with ESMTP id 6633985 for lml@lancaironline.net; Tue, 10 Dec 2013 18:27:28 -0500 Received-SPF: none receiver=logan.com; client-ip=209.86.89.61; envelope-from=douglasbrunner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=RxrPqb20zm2O5IAoS7kw0EdcRB3S++bYZ9dVlM6VyCHqVm+CBE8MofUNOq8Fxzm/; h=Received:From:To:Cc:References:In-Reply-To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:Content-Language:X-ELNK-Trace:X-Originating-IP; Received: from [67.8.30.30] (helo=DougsVAIO) by elasmtp-galgo.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1VqWhZ-0007HY-2J; Tue, 10 Dec 2013 18:26:53 -0500 From: "Douglas Brunner" X-Original-To: "'Lancair Mailing List'" X-Original-Cc: "Harry Hinckley" References: In-Reply-To: Subject: RE: [LML] Gap Seals X-Original-Date: Tue, 10 Dec 2013 18:26:51 -0500 X-Original-Message-ID: <000001cef5ff$4ece94b0$ec6bbe10$@net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01CEF5D5.65F88CB0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Ac71rW0q/Q37/Gb3SGeUYUrG7ut7kQATyMuA Content-Language: en-us X-ELNK-Trace: ad85a799c4f5de37c2eb1477c196d22294f5150ab1c16ac0eab4a5d23dc2aa858b254c80538e4b0ef06a08f2cae36010350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 67.8.30.30 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01CEF5D5.65F88CB0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Steve, =20 I have been talking to Harry Hinkley, ,who has an SX 300 that is about = 20 knots faster than the other SX 300s here at Spruce Creek (7FL6) = =E2=80=93 all due to aerodynamic improvements. =20 First of all, he emphasized that you really have to test what you do. = Some things that look like they should be significant aren=E2=80=99t and = some that don=E2=80=99t look like much turn out to be significant. We = came up with a list that Harry thought was the =E2=80=9Clow hanging = fruit=E2=80=9D =E2=80=93 and I am going to try those first. =20 We decided to put gap seals on both the upper and lower parts of the = flaps. If these work, there should be no need for the compressible foam = tape. The foam tape would stop high pressure air from the below the = wing/flaps from =E2=80=9Cleaking=E2=80=9D through the gap to the low = pressure upper surface. But they will not smooth the flow along the top = and bottom interfaces between the wings and flaps. The top and bottom = gap seals will do both. =20 I am also going to gap seal the rudder and elevator and put some RTV = =E2=80=9Cfairings=E2=80=9D around my antennas. We are going to leave = the ailerons alone. =20 I do have some rudimentary fairings on my flap hinges, but I suspect = there is a lot more that can be done with those four big =E2=80=9Cair = flow disturbers=E2=80=9D hanging below our wings. Clark Baker designed = some flap hinge fairings and he has a VERY fast Legacy. =20 Didn=E2=80=99t manage to finish all the work today so I will (hopefully) = finish tomorrow morning and fly in the afternoon. I=E2=80=99ll keep you = posted. =20 D. Brunner =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Steve Colwell Sent: Tuesday, December 10, 2013 8:40 AM To: lml@lancaironline.net Subject: [LML] Gap Seals =20 OK Doug, here=E2=80=99s another 4 for you. Put Home Depot Compressible = Foam Tape in the wing trailing edge flap pocket. I have been planning = to do this but just haven=E2=80=99t got around to it. Put in 8 more = =E2=80=9Ctricks=E2=80=9D and you are up 40 KNOTS! Don=E2=80=99t laugh = you guys, Lee Behel did it at Reno.=20 =20 Steve Colwell =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Douglas Brunner =09 =20 Any bets on the improvement with gap seals, etc? I am guessing 4 knots. =20 D. Brunner N241DB 700 hrs ------=_NextPart_000_0001_01CEF5D5.65F88CB0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Steve,

 

I have been talking to Harry Hinkley, ,who has an SX 300 that is = about 20 knots faster than the other SX 300s here at Spruce Creek (7FL6) = =E2=80=93 all due to aerodynamic improvements.

 

First of all, he emphasized that you really have to test what you = do.=C2=A0 Some things that look like they should be significant = aren=E2=80=99t and some that don=E2=80=99t look like much turn out to be = significant.=C2=A0 We came up with a list that Harry thought was the = =E2=80=9Clow hanging fruit=E2=80=9D =E2=80=93 and I am going to try = those first.

 

We decided to put gap seals on both the upper and lower parts of the = flaps.=C2=A0 If these work, there should be no need for the compressible = foam tape.=C2=A0 The foam tape would stop high pressure air from the = below the wing/flaps from =E2=80=9Cleaking=E2=80=9D through the gap to = the low pressure upper surface.=C2=A0 But they will not smooth the flow = along the top and bottom interfaces between the wings and flaps.=C2=A0 = The top and bottom gap seals will do both.

 

I am also going to gap seal the rudder and elevator and put some RTV = =E2=80=9Cfairings=E2=80=9D around my antennas.=C2=A0 We are going to = leave the ailerons alone.

 

I do have some rudimentary fairings on my flap hinges, but I suspect = there is a lot more that can be done with those four big =E2=80=9Cair = flow disturbers=E2=80=9D hanging below our wings.=C2=A0 Clark Baker = designed some flap hinge fairings and he has a VERY fast = Legacy.

 

Didn=E2=80=99t manage to finish all the work today so I will = (hopefully) finish tomorrow morning and fly in the afternoon. = I=E2=80=99ll keep you posted.

 

D. Brunner

 

From:= = Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Steve Colwell
Sent: Tuesday, December 10, 2013 8:40 = AM
To: lml@lancaironline.net
Subject: [LML] Gap = Seals

 

OK Doug, here=E2=80=99s another 4 for you.  Put Home Depot = Compressible Foam Tape in the wing trailing edge flap pocket.  I = have been planning to do this but just haven=E2=80=99t got around to = it.  Put in 8 more =E2=80=9Ctricks=E2=80=9D and you are up 40 = KNOTS!  Don=E2=80=99t laugh you guys, Lee Behel did it at Reno. =

 

Steve Colwell

 

From:= = Lancair Mailing List [mailto:lml@lancaironline.net] = On Behalf Of Douglas = Brunner

 

Any bets on the improvement with gap seals, etc?  I am guessing = 4 knots.

 

D. Brunner

N241DB 700 = hrs

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