Return-Path: Received: from ms-smtp-03.southeast.rr.com ([24.93.67.84] verified) by logan.com (CommuniGate Pro SMTP 4.1.4) with ESMTP id 2603511 for flyrotary@lancaironline.net; Thu, 25 Sep 2003 13:04:03 -0400 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-03.southeast.rr.com (8.12.5/8.12.2) with SMTP id h8PH1j4S007534 for ; Thu, 25 Sep 2003 13:01:47 -0400 (EDT) Message-ID: <001301c38386$bc27ff20$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: DIE the short Answer Date: Thu, 25 Sep 2003 13:01:59 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0010_01C38365.34C272C0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0010_01C38365.34C272C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Jim Sower=20 To: Rotary motors in aircraft=20 Sent: Thursday, September 25, 2003 9:13 AM Subject: [FlyRotary] Re: DIE the short Answer <... Hey, hey, Jim. Watch who's work you are calling an "remarkably = extended brain fart.."{:>) ....>=20 The brain fart I was referring to was my tongue-in-cheek notion of = variable length runners would fix our life and make 200 kts effortless. = It suddenly (with my assistance too) took on a life of it's own. Sort = of a "brain fart blossom".=20 <... vibration of large amplitude produced by a relatively small = vibration near the same ...>=20 I was using the term loosly. EDDIE does have some attributes of = resonance, notably resonant frequency.=20 Well, if you are refering to RPM then I will go along with that. = But, not resonance in the "pump" sense where energy is pumped into a = wave because the frequency of the wave is at the resonance frequency of = a tube. etc. =20 Varying boost and perhaps intercooler efficiency might go a long way = toward stabilizing intake temps (and might qualitatively influence your = secret ingredient). Absent that, how much decrease in RPM does a 50F = drop in intake temp require? A CS prop would achieve that at WOT and = would go a long way toward compensating for temp variations due to = boost.=20 <... review it at SERFI next weekend ...> What and where is SERFI = next weekend ? =20 SERFI =3D South East Region Fly in at Evergreen, Al (KGZH) EAA = chapter spounsered first weekend in October. They have created an "Auto = Conversion" award to be awarded this year. I contributed a few = suggestions as a criteria as did Richard Shone? and perhaps some others = on the list. Heres the URL if you want more info: http://www.serfi.org/ know impact EDDIE are Intake Temp, Runner Length, RPM and your = secret ingredient (let's call it "Pixie Dust" at least until it's better = defined at Shady Bend. Runner Length seems, at this juncture, to be the = toughest one to adjust real time (even though one might construct = "summer" and "winter" intakes (sort of like sneakers and boots :o) and = swap them at Sun-Fun and Shady Bend times :o) If the rpm and air temp = variations are manageable, we might come up with an engine performance = computer that knows Runner Length and outputs EDDIE Intake Temp for = current rpm and EDDIE rpm for current Intake Temp. A display like that = could keep us adjusting rpm and boost and intercooler doors to where = we'd be assured that we're flying at the best possible speed when we run = into the Moony or mountain we didn't see with our head up our "engine = monitor".=20 Nice idea, maybe Tracy would incorporate it into his EM2 {:>) Where else could we have this much fun ... ONLY in America !! .... = Jim S.=20 And it's free! Well, for us anyhow, since Marv pays for the server = {:>) Ed=20 =20 ------=_NextPart_000_0010_01C38365.34C272C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 Jim=20 Sower
Sent: Thursday, September 25, = 2003 9:13=20 AM
Subject: [FlyRotary] Re: DIE = the short=20 Answer

<... = Hey, hey,=20 Jim. Watch who's work you are calling an "remarkably extended brain=20 fart.."{:>) ....>
The=20 brain fart I was referring to was my tongue-in-cheek notion of = variable=20 length runners would fix our life and make 200 kts effortless.  = It=20 suddenly (with my assistance too) took on a life of it's own.  = Sort of=20 a "brain fart blossom".=20

<... vibration of = large amplitude=20 produced by a relatively small vibration near the same =20 ...>
I was using=20 the term loosly.  EDDIE does have some attributes of resonance, = notably=20 resonant frequency.=20

 Well, if you are=20 refering to RPM then I will go along with that.  But, not = resonance in=20 the "pump" sense  where energy is pumped into a wave because = the=20 frequency of the wave is at the resonance frequency of a tube. = etc. =20

Varying boost and perhaps = intercooler=20 efficiency might go a long way toward stabilizing intake temps (and = might=20 qualitatively influence your secret ingredient).  Absent that, = how much=20 decrease in RPM does a 50F drop in intake temp require?  A CS = prop=20 would achieve that at WOT and would go a long way toward = compensating for=20 temp variations due to boost.
 <... review it=20 at SERFI next weekend ...> What and where is SERFI next weekend=20 ? 

SERFI =3D South = East Region Fly in=20 at Evergreen, Al (KGZH) EAA chapter spounsered first weekend in=20 October.  They have created an "Auto Conversion" award to = be=20 awarded this year.  I contributed a few suggestions as a = criteria as=20 did Richard Shone? and perhaps some others on the list.  =  Heres=20 the URL if you want more info:
 
http://www.serfi.org/

 know impact EDDIE are Intake = Temp, Runner=20 Length, RPM and your secret ingredient (let's call it "Pixie Dust" = at least=20 until it's better defined at Shady Bend.  Runner Length seems, = at this=20 juncture, to be the toughest one to adjust real time (even though = one might=20 construct "summer" and "winter" intakes (sort of like sneakers and = boots :o)=20 and swap them at Sun-Fun and Shady Bend times :o)  If the rpm = and air=20 temp variations are manageable, we might come up with an engine = performance=20 computer that knows Runner Length and outputs EDDIE Intake Temp for = current=20 rpm and EDDIE rpm for current Intake Temp.  A display like that = could=20 keep us adjusting rpm and boost and intercooler doors to where we'd = be=20 assured that we're flying at the best possible speed when we run = into the=20 Moony or mountain we didn't see with our head up our "engine=20 monitor".

Nice idea, maybe = Tracy would=20 incorporate it into his EM2 {:>)

Where else could we have this = much fun ...=20 ONLY in America !! ....  Jim S.

And it's = free!  Well, for us=20 anyhow, since Marv pays for the server {:>)
 
Ed


 

------=_NextPart_000_0010_01C38365.34C272C0--