Return-Path: Received: from [65.33.85.194] (account ) by logan.com (CommuniGate Pro WebUser 4.1b9) with HTTP id 2470284 for lml@lancaironline.net; Wed, 09 Jul 2003 21:34:31 -0400 From: "Marvin Kaye" Subject: Re: [LML] Mounting the Crossbow 500 AHRS To: lml X-Mailer: CommuniGate Pro WebUser Interface v.4.1b9 Date: Wed, 09 Jul 2003 21:34:31 -0400 Message-ID: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format="flowed" Content-Transfer-Encoding: 8bit Posted for "glong2" : Marvin: My Crossbow 500 AHRS has the 4 mounting bolts plus two high tolerance .25 inch holes for locating pins. I planned to mount my AHRS 500 on a mounting plate using the sloppy fit .29 holes with 1/4 inch bolts. I will fly the plane and make sure the AHRS is mounted correct, then match drill the .25 holes and install locating pins to serve as realignment pins when/if I have to remove the AHRS unit. It seems as though the high precision holes were meant for this. Eugene Long Lancair Super ES glong2@netzero.net [Thanks for the tidbit... after I sent the original post and got back to the project I started leaning along similar lines, but was hoping for a confirmation from someone about this approach. Makes perfect sense, so I'll get the job done tomorrow. While we're on the subject of Crossbows and EFISes, I fired up the panel today after putting the AHRS into position, just to make sure that we had communications and that the EFIS would display properly. I noticed that when I rotated the AHRS in the roll axis the little airplane in the center 9of the EFIS) would remain aligned with the airframe, and the horizon would roll as expected. When I rotated the AHRS in the pitch axis, though, the little airplane remained centered on the rising or falling horizon until I got to about 15-20 degrees, at which time a little ghost circle appeared in the center of the screen that looked to correspond with the nose up or nose down attitude relative to the displayed horizon. Is this normal? I was expecting the EFIS display to react similarly to what I'd see on a gyro horizon, with the airplane remaining in the middle of the display and the horizon moving around it. Movements around the yaw axis appeared normal. I confess that I haven't read the manual yet, but it'd be nice to know whether what I'm seeing is correct for an airplane sitting in the hangar (garage) or if there is a malfunction going on. Any comments would be appreciated. ]