X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 11 Jun 2012 09:12:09 -0400 Message-ID: X-Original-Return-Path: Received: from mail-pz0-f52.google.com ([209.85.210.52] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTPS id 5591957 for lml@lancaironline.net; Sun, 10 Jun 2012 23:47:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.52; envelope-from=pjdmiller@gmail.com Received: by dano14 with SMTP id o14so4548376dan.25 for ; Sun, 10 Jun 2012 20:47:23 -0700 (PDT) Received: by 10.68.222.197 with SMTP id qo5mr4317693pbc.72.1339386443863; Sun, 10 Jun 2012 20:47:23 -0700 (PDT) X-Original-Return-Path: Received: from [192.168.15.12] (S01060017ee00b6c0.cg.shawcable.net. [174.0.115.173]) by mx.google.com with ESMTPS id oy8sm16937848pbc.52.2012.06.10.20.47.22 (version=TLSv1/SSLv3 cipher=OTHER); Sun, 10 Jun 2012 20:47:23 -0700 (PDT) From: Paul Miller Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-33-301975035 Subject: Re: [LML] Power loss during descent X-Original-Date: Sun, 10 Jun 2012 23:47:07 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <1AC37607-9D11-4ECE-81A8-212C80F4E1A1@gmail.com> X-Mailer: Apple Mail (2.1084) --Apple-Mail-33-301975035 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Interesting report Adam. I have done quite a few steep descents on low = fuel as we typically stay light on fuel during our short trips in = Florida. I've never had that issue despite reading very low fuel. I = don't know how you would test the slosh bay but all the discussion makes = me want those inexpensive low sensors in the slosh bay for each side. = That would make a nice annunciator for low fuel in the Legacy. I'm = sure someone has done it and if there was an easy way to add it, I = would. Good luck on finding the problem. Paul Calgary On 2012-06-08, at 12:02 PM, Adam Molny wrote: > Yesterday I had a brief loss of engine power. I'm 26 hours into my = Phase I testing and was doing fuel flow/airspeed tests at various = altitudes while playing around with the leaning function on my new Dynon = SkyView. The attached 'full flight log' file shows the entire 1.7 hour = flight. I was on the right tank for the first 30 minutes, then switched = to the left tank for the next hour. You can see this in the third graph = down from the top, which shows the 'Fuel R' level dropping steadily then = leveling off when I switch tanks.=20 >=20 > I have EI fuel probes with output a frequency proportional to fuel = level. They feed Princeton frequency-to-voltage converters which in turn = talk to the EFIS. The f-to-v converters have a considerable amount of = damping. When combined with the filtering in the EFIS' fuel readout, we = determined that it takes nearly 2 minutes for a fuel level change to = register on the display. As we'll see, that's good for long flights, not = so good when maneuvering.=20 >=20 --Apple-Mail-33-301975035 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii

Yesterday I had a = brief loss of engine power. I'm 26 hours into my Phase I testing and was doing fuel flow/airspeed tests at various altitudes while playing around with the leaning function on my = new Dynon SkyView. The attached 'full flight log' file shows the entire 1.7 hour flight. I was on the right tank for the first 30 minutes, then switched to the left tank for the next hour. You can see this in the = third graph down from the top, which shows the 'Fuel R' level dropping = steadily then leveling off when I switch tanks.
I have EI fuel probes with output a frequency proportional to fuel level. They feed Princeton frequency-to-voltage converters which in turn talk = to the EFIS. The f-to-v converters have a considerable amount of damping. When combined with the filtering in the EFIS' fuel readout, we = determined that it takes nearly 2 minutes for a fuel level change to register on = the display. As we'll see, that's good for long flights, not so good when maneuvering.

= --Apple-Mail-33-301975035--