Return-Path: Received: from [129.116.87.170] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 729074 for flyrotary@lancaironline.net; Mon, 14 Feb 2005 21:02:21 -0500 Received-SPF: none receiver=logan.com; client-ip=129.116.87.170; envelope-from=mark.steitle@austin.utexas.edu X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01C51302.474D43CE" Subject: RE: [FlyRotary] Re: Fuel System Design - Jet Pump Date: Mon, 14 Feb 2005 20:01:35 -0600 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E6CB5CD@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: <87DBA06C9A5CB84B80439BA09D86E69E6CB5CD@MAIL01.austin.utexas.edu> Thread-Topic: [FlyRotary] Re: Fuel System Design - Jet Pump Thread-Index: AcUS/EwRS4nMrwKcRnWZ7cUgNltGlQABNW39 From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C51302.474D43CE Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Tracy, I believe the Jet Pump works off fuel rerouted from the main pump, not = the return fuel. You may need a higher gpm pump in order to provide = enough flow for WOT operations though. If you controlled the transfer = process with a couple of sensors in the main tank, one for upper limit = and another for low limit, it could be a fully automatic system. Mark S. =20 -----Original Message----- From: Rotary motors in aircraft on behalf of Tracy Crook Sent: Mon 2/14/2005 7:17 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Fuel System Design - Jet Pump =20 Thoughts on the jet pump: Jet pump requires a restriction (jet) in the return line. ANY pressure = in the return line adds to the regulated fuel pressure which means your = regulator doesn't regulate accurately any more. Remember that return = flow will change with power setting. Fuel tank levels needs to be controlled in order to eliminate a 'heavy = wing' which is very fatiguing on a long cross country. Aileron trim can = do it but that adds drag. A valve can be used but that adds to the = complexity again. Tracy Ed,=20 Thanks for that excellent article on fuel system design. In reading = through it, on page 5, I came to the description of the jet pump and had = a thought (that alone is a scary thing). I was thinking that this could = be used to eliminate the need for the facet pump in a design such as = Tracy's which would simplify things even more than Tracy's system = already does. Of course, as in Tracy's design, this would eliminate the = need for the fuel selector valve too. As it was designed to do, the Jet = Pump would be powered by excess fuel from the main fuel pump located in = the left tank. Fuel from the other (right) wing tank would be drawn = into the main (left) tank by the Jet Pump. To prevent overfilling the = main tank, transfer could be controlled by a small solenoid valve. = Since you would be drawing fuel from the right tank pretty much all the = time, it may be possible to route the return fuel to the right tank. I = guess this idea could also be used with a sump tank. Time for a sanity = check. =20 =20 Mark S. =20 =20 ------_=_NextPart_001_01C51302.474D43CE Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: base64 eJ8+IiQCAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5NaWNy b3NvZnQgTWFpbC5Ob3RlADEIAQ2ABAACAAAAAgACAAEEgAEAMgAAAFJFOiBbRmx5Um90YXJ5XSBS ZTogRnVlbCBTeXN0ZW0gRGVzaWduIC0gSmV0IFB1bXAAgxABBYADAA4AAADVBwIADgAUAAEAIwAB ACUBASCAAwAOAAAA1QcCAA4AFAABACMAAQAlAQEJgAEAIQAAAEI4MTQ3MjBFQTI2NDk3NEVBNUY2 QzgwODFGNTEzMjg2AAgHAQOQBgC0DAAAOAAAAAMAJgAAAAAAAwA2AAAAAABAADkAzkNNRwITxQEe AD0AAQAAAAUAAABSRTogAAAAAAIBRwABAAAALgAAAGM9dXM7YT0gO3A9QVVTVElOO2w9TUFJTDAx LTA1MDIxNTAyMDEzNVotMjQzMwAAAB4ASQABAAAALgAAAFtGbHlSb3RhcnldIFJlOiBGdWVsIFN5 c3RlbSBEZXNpZ24gLSBKZXQgUHVtcAAAAEAATgAAXJwT/BLFAR4AWgABAAAAGgAAAFJvdGFyeSBt b3RvcnMgaW4gYWlyY3JhZnQAAAACAVsAAQAAAFMAAAAAAAAAgSsfpL6jEBmdbgDdAQ9UAgAAAABS b3RhcnkgbW90b3JzIGluIGFpcmNyYWZ0AFNNVFAAZmx5cm90YXJ5QGxhbmNhaXJvbmxpbmUubmV0 AAACAVwAAQAAACEAAABTTVRQOkZMWVJPVEFSWUBMQU5DQUlST05MSU5FLk5FVAAAAAAeAF0AAQAA AAwAAABUcmFjeSBDcm9vawACAV4AAQAAADgAAAAAAAAAgSsfpL6jEBmdbgDdAQ9UAgAAAABUcmFj eSBDcm9vawBTTVRQAGxvcnMwMUBtc24uY29tAAIBXwABAAAAFAAAAFNNVFA6TE9SUzAxQE1TTi5D T00AHgBmAAEAAAAFAAAAU01UUAAAAAAeAGcAAQAAABwAAABmbHlyb3RhcnlAbGFuY2Fpcm9ubGlu ZS5uZXQAHgBoAAEAAAAFAAAAU01UUAAAAAAeAGkAAQAAAA8AAABsb3JzMDFAbXNuLmNvbQAAHgBw AAEAAAAuAAAAW0ZseVJvdGFyeV0gUmU6IEZ1ZWwgU3lzdGVtIERlc2lnbiAtIEpldCBQdW1wAAAA AgFxAAEAAAAbAAAAAcUS/EwRS4nMrwKcRnWZ7cUgNltGlQABNW39AB4AdAABAAAAGgAAAFJvdGFy eSBtb3RvcnMgaW4gYWlyY3JhZnQAAAAeABoMAQAAAA8AAABNYXJrIFIgU3RlaXRsZQAAHgAdDgEA AAAuAAAAW0ZseVJvdGFyeV0gUmU6IEZ1ZWwgU3lzdGVtIERlc2lnbiAtIEpldCBQdW1wAAAAAgEJ EAEAAADgBQAA3AUAAOUJAABMWkZ1ulCeRgMACgByY3BnMTI14jIDQ3RleAVBAQMB9/8KgAKkA+QH EwKAD/MAUARWPwhVB7IRJQ5RAwECAGNo4QrAc2V0MgYABsMRJfYzBEYTtzASLBEzCO8J97Y7GB8O MDURIgxgYwBQMwsJAWQzNhZQC6YgVDJyANB5LAqiCoBJIAhiZWwIkHZlIHQKaB4wShQgIFB1bahw IHcFsGsEIG8BILwgZgpQAyAYIANgdQ6wPmQfsANhHkMAwAuAIHDhHuEsIG5vBUAeUhggDnQIcAOg H8IuICBZOwhgISF5IdAJ4CCAYSCYaGlnHmAFwGdwINC9IYIgIVEFsASBHkBvIXDpA2B2aQEAIAnw CGAkUB8fsBewB+ACEAXAV09UxR9wcASQYXRpAiAEINceUCaSIxFJH6B5I1EFoPMCMANgbGwgcR5S KZAAcfZmEoEl8WMHkAQgA/AeULskAQWgdQtQHjAfgCAUED8AgAWwBCAhUSD3AZBua78hwAIgHjAn MivwJ8EgHfD2bStwJABuI/Eh4SRiJzLfJvIu8yHALyEr0WwggB3Q7yQBH8ApwCOgYSBQA3EoAJJj LGB5cw6wbS4dVPUdVE0KwGsGACMRM1odVOotNcJPBRBnC4AHQAXQsSshYWdlNcMdVEYDYfY6B/EB kHIjoARgJcAsxPULcHIFAGEBgC4BHcET4D5sH6AsQRzzEiADYG9rLx1UBmACMDgATTnBMi8IMTQv AdAwNSA3KDoxNx7ATR1UVG/HOA85GDtFdWJqBZA70axbRjIQPfRdB/BlPdDORh/SBrAzAiBEB5Ak QF0DoC0ehx1UNJVUKHN03x9hLQRAEAVAIYI6M1oekvMk4xggcXU5QAeRJBBHQacpkA3gKAIgKEUR KSzmjyJlHfAjwCMRQU5ZJeGfKyEIcB4wSM8xoWRkKEH7JdAiJGcxUCfwIHIf0kpX7nckMBPQISBl BiIpIQXAk0zVBbFkbweQbicFQHNM1iQAY2MIcE0hMhJu/z5CGCAjEUEwB4AG0CWSE+B/UGIihCby A/ApwClQE+Bu+zbwK1RwJwASgRQRKABUkN8zS0FzLbIu4B4RbAQgI8L/TEMxkSlpJTod4S8QNmBQ 4uQgJx5gYXYjoAPwVJC2J05FBAAgHiA+MWYn8X9M8FXBObIkEBewXOEFAG/3BBEr0SmBeUniAxAg IS0BuwUQINBjA5FQADDyYiBQ+1L0TBNkHQBV4EnxXBAHQPceIV+CMZF1FBAxcWA7TGW3BaAe8CnQ eCtwMiFnC3GPM0sc8zSvQ5AgRWQhwP9mjEQQLcEEICcyUwMOwCsQ/ynBAjAkAAAgDeAsEiK0MtX/ T/BCQyjCA6AYIEwQXNIeUL8gMSaxMMI5wQqwVKE1IcD/HbBfgAeATFZrkQUDSCIsQb9E2i9DE+Aj 8ihkBUAoYGR/XWFKwUdiBPA+Ih5QVcEp2yjCHxBhKEILgGtslFMh/3NxXfMxZGJjWdseUiPDaPT/ LjEA0EZ2OQJrhSxgGtArkfsEIBzzJytBTmMfIDFSAJD/ZCEGkHNVBCAeEQOgUgJS8v8DoHpGayUH QGxSI6BQAiMR/k8foCvRFAEhwHQxIVF6Rv9rlCHAdUN7JHavd7lq4x3g70AhBbFhlCXAb0niLNEF QP90ImuUdkRQAIFCHnsxVVUj/2KCI6BpggQRH8MgrE10HuL/F7BfgCBiLPUp0DmRLbIjEfdBcyCn L7QoNiFEYEigWzL3VwSH12EBdwOgC4BMZSEz/iiMQkigVxOI4R5aIxE9sO9KQnyROaFcIWZUIWyU LUv/KlcxNylpiOFy8QDAVDEsoN1p0W8mMGGEIxFTC4ArEP8pE49rXNKJjI5TVwRKUQJA/z5BedNU MSoTB3Ew4yOCiDP9BBBpAmBukyAzIh5MV5un/3PTTPArInVDJjErszFhB0D/LKBiJytlSpAe8YyV B2InI/9y8QBwZHIT0AWQjMJmjGedFzQXpu8zWn2rQB4ANRABAAAAQgAAADw4N0RCQTA2QzlBNUNC ODRCODA0MzlCQTA5RDg2RTY5RTZDQjVDREBNQUlMMDEuYXVzdGluLnV0ZXhhcy5lZHU+AAAAHgBH EAEAAAAPAAAAbWVzc2FnZS9yZmM4MjIAAAsA8hABAAAAHwDzEAEAAAB0AAAAUgBFACUAMwBBACAA WwBGAGwAeQBSAG8AdABhAHIAeQBdACAAUgBlACUAMwBBACAARgB1AGUAbAAgAFMAeQBzAHQAZQBt ACAARABlAHMAaQBnAG4AIAAtACAASgBlAHQAIABQAHUAbQBwAC4ARQBNAEwAAAALAPYQAAAAAEAA BzAJccUhARPFAUAACDCQkVtHAhPFAQMA3j+vbwAAAwDxPwkEAAAeAPg/AQAAAA8AAABNYXJrIFIg U3RlaXRsZQAAAgH5PwEAAABFAAAAAAAAANynQMjAQhAatLkIACsv4YIBAAAAAAAAAC9PPUFVU1RJ Ti9PVT1BVVNUSU4vQ049UkVDSVBJRU5UUy9DTj1NUzIAAAAAHgD6PwEAAAAVAAAAU3lzdGVtIEFk bWluaXN0cmF0b3IAAAAAAgH7PwEAAAAeAAAAAAAAANynQMjAQhAatLkIACsv4YIBAAAAAAAAAC4A AAADAP0/5AQAAAMAGUAAAAAAAwAaQAAAAAADAB1AAAAAAAMAHkAAAAAAHgAwQAEAAAAEAAAATVMy AB4AMUABAAAABAAAAE1TMgAeADJAAQAAABwAAABmbHlyb3RhcnlAbGFuY2Fpcm9ubGluZS5uZXQA HgAzQAEAAAAPAAAAbG9yczAxQG1zbi5jb20AAB4AOEABAAAABAAAAE1TMgAeADlAAQAAAAIAAAAu AAAAAwB2QP////8LACkAAAAAAAsAIwAAAAAAAwAGED1IKBUDAAcQegYAAAMAEBAAAAAAAwAREAEA AAAeAAgQAQAAAGUAAABUUkFDWSxJQkVMSUVWRVRIRUpFVFBVTVBXT1JLU09GRkZVRUxSRVJPVVRF REZST01USEVNQUlOUFVNUCxOT1RUSEVSRVRVUk5GVUVMWU9VTUFZTkVFREFISUdIRVJHUE1QVU1Q AAAAAAIBfwABAAAAQgAAADw4N0RCQTA2QzlBNUNCODRCODA0MzlCQTA5RDg2RTY5RTZDQjVDREBN QUlMMDEuYXVzdGluLnV0ZXhhcy5lZHU+AAAA73Y= ------_=_NextPart_001_01C51302.474D43CE--