X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2917392 for flyrotary@lancaironline.net; Sun, 11 May 2008 09:05:17 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([75.191.186.236]) by cdptpa-omta02.mail.rr.com with SMTP id <20080511130437.CTSS15993.cdptpa-omta02.mail.rr.com@edward2> for ; Sun, 11 May 2008 13:04:37 +0000 Message-ID: <003801c8b367$96d51710$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Hairy Chested Heroes Date: Sun, 11 May 2008 09:04:46 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0035_01C8B346.0F7975C0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0035_01C8B346.0F7975C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I agree Lynn. Of the two essential elements - fuel and fire. It = appears that the fuel side of the equation is more likely to be the = culprit than the fire - redundant spark plugs and igniters probably help = on the fire side. =20 Harking to your mention of full-power fuel flow, one of the old time = checks that experimenters made was to elevate the aircraft nose ( or = more likely lower the tail into a hole) to reach a climb attitude and = then run the engine at full power for a period of time sufficient to = show that the fuel system could provide the required fuel flow at that = attitude. But, I think with the advent of electric boost and fuel pumps few folks = do that any more. Ed ----- Original Message -----=20 From: Lehanover@aol.com=20 To: Rotary motors in aircraft=20 Sent: Sunday, May 11, 2008 8:31 AM Subject: [FlyRotary] Re: Hairy Chested Heroes In a message dated 5/11/2008 4:22:41 AM Eastern Daylight Time, = bartrim@gmail.com writes: may well come in the form of an engine failure just after takeoff.=20 Actually the most likely cause of power loss after takeoff will be = fuel management related in all cases. Even for piston engines. The large = displacement piston engines require huge amounts of fuel for take off at = sea level just to avoid detonation. Turbocharged engines even more. So, = if your fuel system has never been set up to provide the excess fuel, = you may be in the red on every take off. This is the Bendix style = dribble fuel injection.=20 The rotary will run with gusto well over rich, as well as well over = lean. Much longer life available at over rich at full throttle best = power, However, that is an EGT problem for the apex seals, and leaning = past best power reduces EGT, so overlean operation is not a problem at = all. Over lean to the point of cutoff may be a bit crisper than a piston = engine, but does no damage.=20 So even a fuel fault would probably get you further along behind (or = ahead of) a rotary than a piston engine. And, if you get the fuel back on in time, there will still be an = engine out there to use it. In so many cases, the difference between an = embarrassing call to the insurance company or two funerals has come down = to another second of power, or less than 24 inches of altitude.=20 Peter was kind enough to leave out "Insane and Lemmings." Lynn E. Hanover=20 -------------------------------------------------------------------------= ----- Wondering what's for Dinner Tonight? Get new twists on family = favorites at AOL Food. ------=_NextPart_000_0035_01C8B346.0F7975C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I agree Lynn.  Of the two = essential=20 elements - fuel and fire.  It appears that the fuel side of the = equation is=20 more likely to be the culprit than the fire - redundant spark plugs and = igniters=20 probably help on the fire side. 
 
Harking to your mention of = full-power fuel=20 flow, one of the old time checks that experimenters made was to elevate = the=20 aircraft nose ( or more likely lower the tail into a hole) to reach a = climb=20 attitude and then run the engine at full power for a period of time = sufficient=20 to show that the fuel system could provide the required fuel flow at = that=20 attitude.
But, I think with the advent = of electric=20 boost and fuel pumps few folks do that any more.
 
Ed
----- Original Message -----
From:=20 Lehanover@aol.com
Sent: Sunday, May 11, 2008 8:31 = AM
Subject: [FlyRotary] Re: Hairy = Chested=20 Heroes

In a message dated 5/11/2008 4:22:41 AM Eastern Daylight Time, bartrim@gmail.com writes:
may well come in the form of an engine failure = just after=20 takeoff.
Actually the most likely cause of power loss after takeoff will = be fuel=20 management related in all cases. Even for piston engines. The large=20 displacement piston engines require huge amounts of fuel for take off = at sea=20 level just to avoid detonation. Turbocharged engines even more. So, if = your=20 fuel system has never been set up to provide the excess fuel, you may = be in=20 the red on every take off. This is the Bendix style dribble fuel = injection.=20
 
The rotary will run with gusto well over rich, as well as well = over lean.=20 Much longer life available at over rich at full throttle best power, = However,=20 that is an EGT problem for the apex seals, and leaning past best power = reduces=20 EGT, so overlean operation is not a problem at all. Over lean to the = point of=20 cutoff may be a bit crisper than a piston engine, but does no damage. =
 
So even a fuel fault would probably get you further along behind = (or=20 ahead of) a rotary than a piston engine.
And, if you get the fuel back on in time, there will still be an = engine=20 out there to use it. In so many cases, the difference between an = embarrassing=20 call to the insurance company or two funerals has come down to another = second=20 of power, or less than 24 inches of altitude.
 
Peter was kind enough to leave out "Insane and = Lemmings."
 
Lynn E. Hanover 



Wondering what's for Dinner Tonight? Get new twists on family favorites at AOL=20 Food.
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