X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 920938 for flyrotary@lancaironline.net; Sat, 30 Apr 2005 21:06:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-189-178.carolina.res.rr.com [24.74.189.178]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j4116CLw011818 for ; Sat, 30 Apr 2005 21:06:13 -0400 (EDT) Message-ID: <000f01c54dea$19a44850$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: NA vs Turbo Re: Ed's new rotor housings Date: Sat, 30 Apr 2005 21:07:09 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01C54DC8.925E2AD0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_000C_01C54DC8.925E2AD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message I know I'm d---- well not taking them off at this point - even = if they cost HP {:>). Notice Tracy says "IF" there is no significant = difference in power then blah blah". Well, I don't have any better = comparison, I changed from my first 86 NA with a poor induction design = to the turbo block with a different intake - so apples and oranges. = However, you'll not convince me a device (the splitter) that perturbs = the exhaust gas sufficiently to knock 8 DB off of a powerful exhaust = spectrum is not taking away some power by restricting the exhaust = outlet. Also, if the splitters don't restrict the flow and therefore = power, why are there so many racers who have the exhaust ported to = increase the area? Seems like if it did no good removing material and = restrictions that they wouldn't be doing it. But, then not being a = racers what do I know about it. But, like you said, short of a side by side comparison with NA and Turbo = Housings on a Dyno don't know how we would really tell. Looks like tomorrow is "go for Launch" Ed A ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Saturday, April 30, 2005 8:32 PM Subject: [FlyRotary] Re: NA vs Turbo Re: Ed's new rotor housings I couldn't remember what the decision was on these splitters, so I did = some research, and pasted the quotes I found below. Unfortunately, I = still don't know the answer. Lynn, Leon, what say you? Rusty (shopping for sandbags) The following quote is from Tracy's squawk_muffler page, and would = tend to suggest that there isn't much HP to be gained with the turbo = housings, though he isn't making a definitive statement to that effect. = March 3, 2001 Mufflers.. the Saga Continues=20 ... Now the question is, If all other things are equal, is = there any significant power difference between the turbo and non turbo = rotor housings? Ever done an A/B comparison on this? I did have a small = increase in power when I changed to turbo housings but that was = comparing an old junkyard dog engine with lower compression rotors to a = freshly blue printed engine with high compression rotors. If it turns = out that there is no significant difference in power, we've been going = down the wrong path with the turbo housings. And here I am with a brand = new 20B with turbo housings..........=20 The following quote is from the archives, about 6 weeks later. This = would suggest (second hand) that Bruce thinks there is significant HP to = be gained by using the turbo housings. =20 Date Wed, 18 Apr 2001 103007 -0700 From "Mike Wills" Subject Re Engine Selection for 13B Bob, I discussed this with Bruce Turrentine who is currently assembling = an NA engine for me. It just so happened that Tracy mentioned his = conclusions about using the splitter equipped housings when Bruce was buying the = parts to build my engine. Bruce told me the NA housings would likely cost as much as 15-20HP. = After discussing the options with him I decided to go ahead with the turbo housings.=20 (the rest snipped) ------=_NextPart_000_000C_01C54DC8.925E2AD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
 I know I'm  d---- well not = taking them=20 off at this point - even if they cost HP {:>).  Notice Tracy = says=20  "IF" there is no significant difference in power then blah = blah". =20 Well, I don't have any better comparison, I changed from my first 86 NA = with a=20 poor induction design to the turbo block with a different intake - so = apples and=20 oranges.  However, you'll not convince me a device (the splitter)=20  that perturbs the exhaust gas sufficiently to knock 8 DB off = of a=20 powerful exhaust spectrum is not taking away some power by restricting = the=20 exhaust outlet.  Also, if the splitters don't restrict the flow and = therefore power, why are there so many racers who have the exhaust = ported to=20 increase the area?  Seems like if it did no good removing material = and=20 restrictions that they wouldn't be doing it.  But, then not being a = racers=20 what do I know about it.
 
 
But, like you said, short of a side by = side=20 comparison with NA and Turbo Housings on a Dyno don't know how we would = really=20 tell.
 
Looks like tomorrow is "go for = Launch"
 
Ed A
 
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Saturday, April 30, 2005 = 8:32=20 PM
Subject: [FlyRotary] Re: NA vs = Turbo Re:=20 Ed's new rotor housings

I = couldn't remember what=20 the decision was on these splitters, so I did some research, and = pasted the=20 quotes I found below.  Unfortunately, I still don't know the = answer.=20 Lynn, Leon, what say you?

Rusty (shopping for = sandbags)

 

The following quote is from Tracy's squawk_muffler = page, and=20 would tend to suggest that there isn't much HP to be gained with the = turbo=20 housings, though he isn't making a definitive statement to that=20 effect.  

March 3, = 2001 =20 Mufflers.. the Saga Continues
... Now the question  = is,  If all=20 other things are equal, is there any significant power = difference=20 between the turbo and non turbo rotor housings? Ever done an A/B = comparison on this?  I did have a small increase in power = when I=20 changed to turbo housings but  that was comparing an old = junkyard=20 dog engine with lower compression rotors to a freshly blue = printed=20 engine with high compression rotors.   If it turns out = that=20 there is no significant difference in power,  we've been = going down=20 the wrong path with the turbo housings.  And here I am with = a brand=20 new 20B with turbo=20 = housings..........

The = following quote is=20 from the archives, about 6 weeks later.  This would suggest = (second=20 hand) that Bruce thinks there is significant HP to be gained by = using the=20 turbo housings.   


Date=20 Wed, 18 Apr 2001 103007 -0700
From "Mike Wills"=20 <willsm@spawar.navy.mil>
Subject Re Engine Selection for=20 13B

Bob,

  I discussed this with Bruce Turrentine = who is=20 currently assembling an NA
engine for me. It just so happened that = Tracy=20 mentioned his conclusions
about using the splitter equipped = housings when=20 Bruce was buying the parts
to build my engine.
  Bruce told = me the=20 NA housings would likely cost as much as 15-20HP. After
discussing = the=20 options with him I decided to go ahead with the turbo
housings. =

(the rest snipped)

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