Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2585820 for flyrotary@lancaironline.net; Fri, 19 Sep 2003 12:09:51 -0400 Received: from rad ([68.212.12.251]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030919160946.GUHK10992.imf25aec.mail.bellsouth.net@rad> for ; Fri, 19 Sep 2003 12:09:46 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Not sure how many horses really came back Date: Fri, 19 Sep 2003 11:09:46 -0500 Message-ID: <01aa01c37ec8$720476c0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01AB_01C37E9E.892E6EC0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_01AB_01C37E9E.892E6EC0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Don't even think about removing that turbo. You keep thinking in terms = of boost, but you should be thinking in terms of h.p. (and RPM) What I = mean is that I have never heard of a 13b blowing itself up that was producing = less than 250 hp. Let alone less than 200. If you are not making the h.p., = then you are not stressing the engine.=20 =20 I agree with this logic. =20 =20 Same argument goes for normalizing. So what if it takes 11 psi of boost = at altitude?=20 =20 This "may" be fine for the engine, but it could be pushing the stock = turbo pretty hard. Guys run these things on the street at higher levels, but that's for maybe 15 seconds at a time. Sure wish I had a compressor map = for the stock turbo. =20 =20 What do you have to loose. Worst case, its really not that hard to re = build an engine (compared to re-doing the intake and exhaust systems).=20 =20 Of course if you're turbo system blows the engine, you won't run it that = way again, so you'll be re-doing the intake, exhaust AND rebuilding an = engine :-) I can pretty much say that the rotary has a one engine chance of success. If it blows, I'll be shopping for a Lycoming. =20 I'm going to try to go to the airport this afternoon, and stuff a thermocouple inside the hose from the turbo to the intake. I want to = tie the plane down, and run the engine at various boost settings, to see = what the intake temp is. Hopefully, it won't be too high, but we'll see. As I've stated a few times already, there's no way I'm installing an intercooler. There's just no available space, or weight for it. As = long as the temps don't seem dangerously high at 5 psi, I'll fly it again this weekend, and see what it will do with a bit more boost. =20 =20 Cheers, Rusty=20 =20 =20 ------=_NextPart_000_01AB_01C37E9E.892E6EC0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Don’t = even think about=20 removing that turbo.  You keep thinking in terms of boost, but you = should=20 be thinking in terms of h.p. (and RPM)  What I mean is that I have = never=20 heard of a 13b blowing itself up that was producing less than 250 hp. = Let alone=20 less than 200.  If you are not making the h.p., then you are not = stressing=20 the engine. 
 
I agree = with this=20 logic.  
 
Same argument = goes for=20 normalizing.  So what if it takes 11 psi of boost at altitude? 
 
This "may" be=20 fine for the engine, but it could be pushing the stock turbo = pretty=20 hard.  Guys run these things on the street at higher levels, but = that's for=20 maybe 15 seconds at a time.  Sure wish I had a compressor map for = the stock=20 turbo. 
 
What do you = have to=20 loose.  Worst case, its really not that hard to re build an engine=20 (compared to re-doing the intake and exhaust systems). 
 
Of course if = you're turbo=20 system blows the engine, you won't run it that way again, so you'll = be=20 re-doing the intake, exhaust AND rebuilding an engine = :-)   I can=20 pretty much say that the rotary has a one engine chance of = success.  If=20 it blows, I'll be shopping for a=20 Lycoming.
 
I'm going to = try to go to=20 the airport this afternoon, and stuff a thermocouple inside the = hose from=20 the turbo to the intake.  I want to tie the plane down, = and run=20 the engine at various boost settings, to see what the = intake=20 temp is.  Hopefully, it won't be too high, but we'll = see.  As=20 I've stated a few times already, there's no way I'm installing an=20 intercooler.  There's just no available space, or weight for=20 it.  As long as the temps don't seem dangerously high at 5 = psi, I'll=20 fly it again this weekend, and see what it will do with a bit=20 more boost.   
 
Cheers,
Rusty 

 

 
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