X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 05 Apr 2006 21:55:41 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d05.mx.aol.com ([205.188.157.37] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1059508 for lml@lancaironline.net; Wed, 05 Apr 2006 19:31:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.37; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d05.mx.aol.com (mail_out_v38_r7.3.) id q.259.9f9f540 (39953) for ; Wed, 5 Apr 2006 19:30:22 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <259.9f9f540.3165ad0e@aol.com> X-Original-Date: Wed, 5 Apr 2006 19:30:22 EDT Subject: Re: [LML] Re: GPSS roll steering X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1144279822" X-Mailer: 9.0 Security Edition for Windows sub 2340 X-Spam-Flag: NO -------------------------------1144279822 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 4/5/2006 5:04:56 P.M. Central Daylight Time, N4ZQ@comcast.net writes: Just curious to see if there is any consensus on whether this upgrade to my Stec System 30 would be worth the $986.00 from Aircraft Spruce. As near as I can tell, as you pass each succeeding waypoint, it enables the auto pilot to intercept and track the course to the next waypoint, regardless of the size of the intercept angle. Right? Angier, Not quite. Check your GPS ARINC output specs. On a Garmin 430, a computed turn that requires more than standard rate (perhaps 1/2 standard rate), probably calculated from ground speed, will be left to the pilot with the warning "Steep Turn Ahead." At approach speeds (120 KIAS), it is a beauty to watch the A/P and GPS + GPSS work to make 90 degree turns by starting a mile from the way point and coming out precisely on the course line and correct MH (typical T shaped GPS approach). Cruise is most often accomplished "direct to" and no interesting turns are required unless you are racing a closed course with the A/P engaged. Remember that ARINC GPS turn information is converted to turn coordinator commands passed to the A/P. Just like turning the bug knob on the DG. That is, the GPSS device allows you to select heading mode on the A/P and then select whether the DG or the GPS is to provide directional control to the A/P. Is it worth it? You bet. Scott Krueger AKA Grayhawk LNC2 N92EX IO 320 SB 89/96 -------------------------------1144279822 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 4/5/2006 5:04:56 P.M. Central Daylight Time,=20 N4ZQ@comcast.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Just=20 curious to see if there is any consensus on whether this upgrade to=20 my Stec System 30 would be worth the $986.00 from Aircraft Spruce.
As n= ear=20 as I can tell, as you pass each succeeding waypoint, it
enables=20= the=20 auto pilot to intercept and track the course to the next
waypoin= t,=20 regardless of the size of the intercept angle.=20 Right?

Angier,

Not quite. Check your GPS ARINC output specs. On a Gar= min=20 430, a computed turn that requires more than standard rate (perhaps 1/2= =20 standard rate), probably calculated from ground speed, will be left to the p= ilot=20 with the warning "Steep Turn Ahead." At approach speeds (120 KIAS= ),=20 it is a beauty to watch the A/P and GPS + GPSS work to make 90 degree t= urns=20 by starting a mile from the way point and coming out precisely on the course= =20 line and correct MH (typical T shaped GPS approach). Cruise is most of= ten=20 accomplished "direct to" and no interesting turns are required unless y= ou=20 are racing a closed course with the A/P engaged.

Remember that ARINC GPS turn information is converted to turn=20 coordinator commands passed to the A/P. Just like turning the bug knob= on=20 the DG. That is, the GPSS device allows you to select heading mode on=20= the=20 A/P and then select whether the DG or the GPS is to provide directional cont= rol=20 to the A/P.

Is it worth it? You bet.=20

Scott Krueger=20 AKA Grayhawk
LNC2 N92EX IO 320 SB=20 89/96

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