X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from aspensprings.uwyo.edu ([129.72.10.32] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTPS id 5671715 for flyrotary@lancaironline.net; Sat, 21 Jul 2012 15:29:44 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.32; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht5.uwyo.edu (extlb.uwyo.edu [172.26.4.4]) by aspensprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id q6LJT3lN006802 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Sat, 21 Jul 2012 13:29:06 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-m10.uwyo.edu ([fe80::60dd:cb9e:6f71:3d48]) by ponyexpress-ht5.uwyo.edu ([fe80::addc:5ab0:b0f8:ab9e%13]) with mapi id 14.01.0339.001; Sat, 21 Jul 2012 13:29:05 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] Voltage fluctuation. Thread-Topic: [FlyRotary] Voltage fluctuation. Thread-Index: AQHNZwgAxla5w1r+y0eR/xogks487Jc0HWsO Date: Sat, 21 Jul 2012 19:29:03 +0000 Message-ID: <3E8191F276108F4481AB0721BBA9269E05C66DF2@ponyexpress-m10.uwyo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [75.196.187.33] Content-Type: multipart/alternative; boundary="_000_3E8191F276108F4481AB0721BBA9269E05C66DF2ponyexpressm10u_" MIME-Version: 1.0 --_000_3E8191F276108F4481AB0721BBA9269E05C66DF2ponyexpressm10u_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Bill, I don't have an EM-2, but I log the bus voltage (among other things) every = 3 seconds on every flight with a data logger of my own design. On a 1.5 hr= flight today, the bus voltge slowly drifted from 13.6 to 14.0 which seems = to correlate to the under cowl temperature. The short term variation as in= dicated from one reading to the next is 0.1 volt or less. The majority of = the time, the voltage was 13.8 to 14.0. This is with a stock 1986 RX7 inte= rnally regulated alternator, a single PC680 battery, and the normal engine = support systems and strobes operating. Steve Boese RV6A, 1986 13B NA, RD1A, EC2 ________________________________ From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of = Bill Bradburry [bbradburry@bellsouth.net] Sent: Saturday, July 21, 2012 12:13 AM To: Rotary motors in aircraft Subject: [FlyRotary] Voltage fluctuation. How solid should the buss voltage reading be on the EM-2? My voltage seems= to float over about a half volt. I don=92t know if there is something wro= ng with my voltage regulator or if this is normal. What do you guys see? Bill B --_000_3E8191F276108F4481AB0721BBA9269E05C66DF2ponyexpressm10u_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable

Bill,

I don't have an EM-2, but I log the bus voltage (among other things) eve= ry 3 seconds on every flight with a data logger of my own design. On = a 1.5 hr flight today, the bus voltge slowly drifted from 13.6 to 14.0 whic= h seems to correlate to the under cowl temperature. The short term variation as indicated from one reading = to the next is 0.1 volt or less. The majority of the time, the voltag= e was 13.8 to 14.0. This is with a stock 1986 RX7 internally regulate= d alternator, a single PC680 battery, and the normal engine support systems and strobes operating.

Steve Boese

RV6A, 1986 13B NA, RD1A, EC2

From: Rotary motors in aircraft [flyrotary= @lancaironline.net] on behalf of Bill Bradburry [bbradburry@bellsouth.net]<= br> Sent: Saturday, July 21, 2012 12:13 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Voltage fluctuation.

How solid should the buss voltage reading b= e on the EM-2? My voltage seems to float over about a half volt. = ; I don=92t know if there is something wrong with my voltage regulator or if this is normal. What do you guys see?=

Bill B

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