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Date: Mon, 28 May 2012 13:17:00 -0400
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From: Gary Casey <casey.gary@yahoo.com>
Reply-To: Gary Casey <casey.gary@yahoo.com>
Subject: Re: 360 still surging
In-Reply-To: <listdigest-5562542@logan.com>
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Berni,=0AIn my opinion, you've got it. =A0Certainly some cooling air flow t=
o the gascolator will help some more. =A0Carefully-designed shrouds over bo=
th the fuel pump and gascolator will reduce the amount of air required for =
cooling and that might be the "final answer." =A0I wouldn't go to extreme m=
easures to totally eliminate the surging after a hot start, as there is pro=
bably no way to do that. =A0But the surging should go away during taxi and =
should be gone during the run-up. =A0The design of the system is such that =
total elimination of vapor generation is just not feasible. =A0Note that th=
ere is a "return system" commercially available that allows fuel to be reci=
rculated before starting, and some operators report good results. =A0But pe=
rsonally, I don't think it is necessary and it introduces more potential fa=
ilure modes.=0AGary=0A=0AI am not ready to celebrate yet but I definitely s=
ee a marked reduction in the severity of the surge and the ability, at leas=
t today, to eliminate any surge by simply taxiing and or a bit of an extend=
ed run up. =A0I believe the blast air is the reason for the improvement. =
=A0I believe I should also add a second blast tube with the air directed at=
 the gascolator.=0A>=0A>=0A>Does this make sense? =A0Any and all comments w=
elcome!=0A>=0A>=0A>Berni
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:bo=
okman old style, new york, times, serif;font-size:12pt"><div>Berni,</div><d=
iv>In my opinion, you've got it. &nbsp;Certainly some cooling air flow to t=
he gascolator will help some more. &nbsp;Carefully-designed shrouds over bo=
th the fuel pump and gascolator will reduce the amount of air required for =
cooling and that might be the "final answer." &nbsp;I wouldn't go to extrem=
e measures to totally eliminate the surging after a hot start, as there is =
probably no way to do that. &nbsp;But the surging should go away during tax=
i and should be gone during the run-up. &nbsp;The design of the system is s=
uch that total elimination of vapor generation is just not feasible. &nbsp;=
Note that there is a "return system" commercially available that allows fue=
l to be recirculated before starting, and some operators report good result=
s. &nbsp;But personally, I don't think it is necessary and it
 introduces more potential failure modes.</div><div>Gary</div><div><br></di=
v><div><span class=3D"Apple-style-span" style=3D"color: rgb(69, 69, 69); fo=
nt-family: arial, helvetica, sans-serif; font-size: 13px; "><blockquote typ=
e=3D"cite" style=3D"display: block; margin-top: 1em; margin-right: 1em; mar=
gin-bottom: 1em; margin-left: 1em; "><div><font color=3D"black" size=3D"2" =
face=3D"arial"><div style=3D"font-family: arial, helvetica; color: black; f=
ont-size: 10pt; "><div id=3D"yiv820375805AOLMsgPart_1_58c19a0a-ca2d-4bde-9b=
5b-1b999a1bd568"><div>I am not ready to celebrate yet but I definitely see =
a marked reduction in the severity of the surge and the ability, at least t=
oday, to eliminate any surge by simply taxiing and or a bit of an extended =
run up. &nbsp;I believe the blast air is the reason for the improvement. &n=
bsp;I believe I should also add a second blast tube with the air directed a=
t the gascolator.</div><div><br></div><div>Does this make sense? &nbsp;Any =
and all
 comments welcome!</div><div><br></div><div>Berni</div></div></div></font><=
/div></blockquote></span></div>  </div></body></html>
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