X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 07 Apr 2008 21:03:52 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 5.2.1) with ESMTP id 2835698 for lml@lancaironline.net; Mon, 07 Apr 2008 10:25:16 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.4; envelope-from=PTACKABURY@aol.com Received: from PTACKABURY@aol.com by imo-m23.mx.aol.com (mail_out_v38_r9.3.) id q.d5b.23c734bc (48552) for ; Mon, 7 Apr 2008 10:24:33 -0400 (EDT) From: PTACKABURY@aol.com X-Original-Message-ID: X-Original-Date: Mon, 7 Apr 2008 10:25:03 EDT Subject: Re: [LML] Horizontal Stabilizer Incidence Angle for IV-P X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1207578303" X-Mailer: Unknown sub 34 X-Spam-Flag: NO -------------------------------1207578303 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en Giff: I wrestled with this one and after thinking on it a bit and talking=20 to Mark Mahnke and some wizards of aero I set the horz to the wing not the=20 fuselage and in doing so the fast build horz saddle needed only a little =20 shimming. I suggest you rig the wings first and get them symmetrical at ab= out +1.0=20 degrees or whatever the book sez. Then mount the horz with a degree to a=20 degree and a half less incidence and let the fuselage be whatever it is. I= =20 mounted my horz level with respect to the wings (eg if the wings were +1.0=20= degree=20 my horz is 0.0) because my IV is not pressurized and is therefore a bit=20 lighter and of course faster and therefore might need less neg AOA on the t= ail,=20 depending on CG of course. Oh, and it all seems to work fine with little u= p=20 elevator at cruise (not much trim drag). paul, N94PT =20 =20 In a message dated 4/6/2008 9:13:52 P.M. Pacific Daylight Time, =20 GAMarr@Charter.Net writes: =20 I am in the process of installing the Horizontal Stabilizer. I have used a=20 water level to level the Fuselage, using the leveling marks molded into the= =20 structure.=20 When I place the HS in the preinstalled fixture for the HS, I find that I=20 have almost a -1.4 degrees nose down. When I adjust the HS to reflect the -= 0.6=20 degrees, the leading edge of the HS is about 3/16 above the fixture. My kit= ,=20 386, is a fast build kit, so the fixture was installed at the factory. Is i= t=20 possible that the fixture was installed slightly off the manual =20 specification???=20 I have reviewed the builder=E2=80=99s manual and it calls for -0.6 degrees,= nose=20 down incidence. I have noted in some in-flight pictures that in many cases=20= the=20 elevator is slightly down, which in my mind means either the aircraft is at= an=20 aft CG or the HS has too much nose down incidence. Has anyone noted either=20 of these problems???=20 Would it be prudent to decrease the nose down incidence, and if so, how=20 much???=20 Giff Marr=20 LIV-P/Mistral 65%=20 **************Planning your summer road trip? Check out AOL Travel Guides. =20= =20 (http://travel.aol.com/travel-guide/united-states?ncid=3Daoltrv00030000000= 016) -------------------------------1207578303 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en

Giff: I wrestled with this one and after thinking on it a bit and= =20 talking to Mark Mahnke and some wizards of aero I set the horz to the wing n= ot=20 the fuselage and in doing so the fast build horz saddle needed only a little= =20 shimming. I suggest you rig the wings first and get them symmetrical a= t=20 about +1.0 degrees or whatever the book sez. Then mount the horz with=20= a=20 degree to a degree and a half less incidence and let the fuselage be whateve= r it=20 is. I mounted my horz level with respect to the wings (eg if the wings= =20 were +1.0 degree my horz is 0.0) because my IV is not pressurized and is=20 therefore a bit lighter and of course faster and therefore might need less=20 neg AOA on the tail, depending on CG of course. Oh, and it all se= ems=20 to work fine with little up elevator at cruise (not much trim drag).

paul, N94PT

In a message dated 4/6/2008 9:13:52 P.M. Pacific Daylight Time,=20 GAMarr@Charter.Net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

I am in the process of insta= lling=20 the Horizontal Stabilizer. I have used a water level to level the Fuselage= ,=20 using the leveling marks molded into the=20 structure.

When I place the HS in the=20 preinstalled fixture for the HS, I find that I have almost a -1.4 degrees=20= nose=20 down. When I adjust the HS to reflect the -0.6 degrees, the leading edge o= f=20 the HS is about 3/16 above the fixture. My kit, 386, is a fast build kit,=20= so=20 the fixture was installed at the factory. Is it possible that the fixture=20= was=20 installed slightly off the manual=20 specification???

I have reviewed the builder= =E2=80=99s=20 manual and it calls for -0.6 degrees, nose down incidence. I have noted in= =20 some in-flight pictures that in many cases the elevator is slightly down,=20 which in my mind means either the aircraft is at an aft CG or the HS has t= oo=20 much nose down incidence. Has anyone noted either of these=20 problems???

Would it be prudent to decre= ase=20 the nose down incidence, and if so, how much???

Giff=20 Marr

LIV-P/Mistral=20 65%

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