X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp2.uwyo.edu ([129.72.10.37] verified) by logan.com (CommuniGate Pro SMTP 6.0.4) with ESMTPS id 6221647 for flyrotary@lancaironline.net; Tue, 23 Apr 2013 14:12:05 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.37; envelope-from=SBoese@uwyo.edu Received: from smtp2.uwyo.edu (localhost [127.0.0.1]) by localhost (Postfix) with SMTP id 74D03390EA9 for ; Tue, 23 Apr 2013 12:11:31 -0600 (MDT) Received: from ponyexpress-ht4.uwyo.edu (extlb.uwyo.edu [172.26.4.4]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp2.uwyo.edu (Postfix) with ESMTPS id 3BA01390EB0 for ; Tue, 23 Apr 2013 12:11:31 -0600 (MDT) Received: from ponyexpress-m10.uwyo.edu ([fe80::60dd:cb9e:6f71:3d48]) by ponyexpress-ht4.uwyo.edu ([fe80::8de7:b225:a85b:d0ee%13]) with mapi id 14.02.0318.001; Tue, 23 Apr 2013 12:11:31 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] Re: Fuel injector pulse frequency Thread-Topic: [FlyRotary] Re: Fuel injector pulse frequency Thread-Index: AQHOQCLA6ndfOM25+kOSRO4iffIPXpjkGXGa Date: Tue, 23 Apr 2013 18:11:31 +0000 Message-ID: <3E8191F276108F4481AB0721BBA9269E05FA16E7@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: [70.196.198.32] Content-Type: multipart/alternative; boundary="_000_3E8191F276108F4481AB0721BBA9269E05FA16E7ponyexpressm10u_" MIME-Version: 1.0 --_000_3E8191F276108F4481AB0721BBA9269E05FA16E7ponyexpressm10u_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Gordon, The injector pulse duration will generally range betwen 2 and 8 millisecond= s, primarily determined by manifold pressure rather than RPM. Discounting = volumetric efficiency changes, the engine uses more fuel at high RPM not be= cause the pulses are longer, but rather because they happen more often. Steve ________________________________ From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of = Gordon Alling [gordon@acumen-ea.com] Sent: Tuesday, April 23, 2013 7:01 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Fuel injector pulse frequency Thanks, Steve. This is really great info. Do you have any info on the ran= ge of the injector pulse duration over the RPM range, i.e. min and max puls= e duration I can expect? Thanks. Gordon C. Alling, Jr., PE President acumen Engineering/Analysis, Inc. 540-786-2200 www.acumen-ea.com --_000_3E8191F276108F4481AB0721BBA9269E05FA16E7ponyexpressm10u_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Gordon,

The injector pulse duration will generally range betwen 2 and 8 millisec= onds, primarily determined by manifold pressure rather than RPM. Disc= ounting volumetric efficiency changes, the engine uses more fuel at high RP= M not because the pulses are longer, but rather because they happen more often.

Steve

From: Rotary motors in aircraft [flyrotary= @lancaironline.net] on behalf of Gordon Alling [gordon@acumen-ea.com]
Sent: Tuesday, April 23, 2013 7:01 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Fuel injector pulse frequency

Thanks, Steve. = This is really great info. Do you have any info on the range of the i= njector pulse duration over the RPM range, i.e. min and max pulse duration = I can expect?

Thanks.

Gordon C. Alling, Jr.= , PE

President

acumen <= /span>

540-786-2200
www.acumen-ea.com

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