X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 03 Aug 2014 11:29:13 -0400 Message-ID: X-Original-Return-Path: Received: from mtaz1.mailnet.ptd.net ([204.186.29.65] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTP id 7060280 for lml@lancaironline.net; Sat, 02 Aug 2014 10:00:33 -0400 Received-SPF: pass receiver=logan.com; client-ip=204.186.29.65; envelope-from=liegner@ptd.net Received: from mtaz1.mailnet.ptd.net (localhost [127.0.0.1]) by mtaz1.mailnet.ptd.net (Postfix) with ESMTP id 0F90E200D9 for ; Sat, 2 Aug 2014 09:59:59 -0400 (EDT) Received: from mtaz1.mailnet.ptd.net (localhost [127.0.0.1]) by mtaz1.mailnet.ptd.net (Postfix) with ESMTP id EDB9B200CC for ; Sat, 2 Aug 2014 09:59:58 -0400 (EDT) Received: from mb6.mailnet.ptd.net (mb6.mailnet.ptd.net [204.186.29.27]) by mtaz1.mailnet.ptd.net (Postfix) with ESMTP id DF37F200D9 for ; Sat, 2 Aug 2014 09:59:57 -0400 (EDT) X-Original-Date: Sat, 2 Aug 2014 09:59:57 -0400 (EDT) From: jeffrey liegner X-Original-To: Lancair Mailing List X-Original-Message-ID: <1758709028.45286849.1406987997086.JavaMail.zimbra@ptd.net> In-Reply-To: <1717338973.45263707.1406986936507.JavaMail.zimbra@ptd.net> Subject: N40941 (LIVP) Filed TAS 295 knots. Was this realistic at 15000' cruise and 1 AM? MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Originating-IP: [76.28.159.214] X-Mailer: Zimbra 8.0.7_GA_6029 (ZimbraWebClient - SAF7 (Mac)/8.0.7_GA_6021) Thread-Topic: N40941 (LIVP) Filed TAS 295 knots. Was this realistic at 15000' cruise and 1 AM? Thread-Index: jh3+antiSl4fTA5HtNjCmu4WOlBu7Q== When I read about Raif Bronnenmeier's fatal accident, I went to Flightaware to see the flight path, as was suggested in a posting a couple days ago. Flightaware has him descending at 1am (in the darkness of morning, possibly IMC) into his destination airport, with a groundspeed of 269 knots (310 mph) at 3600 MSL (reporting), the last transponder report before impact. That is so very fast, especially at night and 2600 AGL, especially after a long day, that this seems most unusual for the obvious reasons. But then I noted that he filed 295 TAS for most of his flights, even when planning for 12,000' cruise in this piston LIVP. I usually file 240 TAS to 250 TAS depending on altitude (16K' to FL230, respectively); and 12,000' LOP would be 230 TAS. Some of his flights never realized this in groundspeed, but some did; Flightaware only reports groundspeed measured, but the filed speed is listed. http://flightaware.com/live/flight/N40941/history/20140726/1800Z/KDUH/KBIV http://flightaware.com/live/flight/N40941/history/20140720/0110Z/KMCD/5G7 Who among us with LIVP files 295 knots TAS? Realistically, I doubt that any of us (even the turboprop Evolutions) can cruise at 295 knots true, which reminds me of the TAS calculation error caused by engine exhaust contamination and thermal effect that inflates the true airspeed presented by the onboard computers. Jeff L LIVP