X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1010427 for flyrotary@lancaironline.net; Wed, 22 Jun 2005 16:09:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=13brv3@bellsouth.net Received: from ibm58aec.bellsouth.net ([65.6.194.9]) by imf16aec.mail.bellsouth.net with ESMTP id <20050622200817.IABA885.imf16aec.mail.bellsouth.net@ibm58aec.bellsouth.net> for ; Wed, 22 Jun 2005 16:08:17 -0400 Received: from rd ([65.6.194.9]) by ibm58aec.bellsouth.net with ESMTP id <20050622200816.WAXT1856.ibm58aec.bellsouth.net@rd> for ; Wed, 22 Jun 2005 16:08:16 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: PP debate was Re: Single PP HP? Date: Wed, 22 Jun 2005 15:08:17 -0500 Message-ID: <000001c57766$217b5eb0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C5773C.38A7A0A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C5773C.38A7A0A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I would really like to hear the logic on that one! (Why RB or Leon = recomend against.)=20 =20 Racing Beat is easy. Here's their number- 714-779-8677 (8-5 PST) =20 If Leon gets a chance, maybe he will pass along his thoughts as well. =20 =20 Aircraft need HP! There are two RV's flying now with the Powersport conversion. (Which is PP) Van's is doing comparison flying against the lycomings, or may have finished already. To be published in the RVator newsletter. They posted that they loved the performance. Powersports conversion is expensive, and they need to work on the radiator layout. = The performance IS good however.=20 =20 The article was published a couple months ago. Sadly, they only barely = beat the 180 HP factory RV-8 in climb to 8000 ft. One beat it by 15 seconds, = the other by 8 seconds. For top speed, the PS engines ran 183 and 180 kts, = and the 180 HP factory plane ran 179 kts. The PS engines burned = considerably more fuel, and were quite a bit louder. =20 =20 I'd bet Tracy's Renesis, with an MT C/S prop (since they had them), in = an RV-8 would kick there ass. I would also bet that Lynn, Leon, or Bruce = could easily build a mildly ported 13B that would run just as strong as the = "215 HP" powersports engines. =20 =20 If your timing on the PP isn't super radical you shouldn't have any = idle problems. =20 =20 I guess this would be true, but when you eliminate timing overlap, don't = you also eliminate most of the power advantage? It just seems like a mild mannered PP is a waste of time, UNLESS it's the only means to an end, = such as in Richard and George's custom side plated production. =20 =20 Remember all the early rotary engines were PP!=20 =20 I've heard the stories. Interesting how they quickly went away from = that configuration :-) =20 As I mentioned earlier, I'm NOT a rotary engine expert, and I've never = even seen a PP run. At my level of experience, the smartest thing I can do = is listen to the people who have years of experience. There are a lot of = new, impressionable folks lurking on this list, and I don't want them to get = the idea that a homemade PP engine is automatically going to be better than = the stock side port. It "might" be, but there's no evidence of it that I've seen yet. =20 =20 Cheers, Rusty (someone has to play the villain) =20 =20 =20 =20 ------=_NextPart_000_0001_01C5773C.38A7A0A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
I would really like to = hear the=20 logic on that one! (Why RB or Leon recomend against.) 
 
Racing Beat=20 is easy.  Here's their number- 714-779-8677  (8-5=20 PST)
 
If Leon gets=20 a chance, maybe he will pass along his thoughts as well. =20  
 
Aircraft need HP! There = are=20 two RV's flying now with the Powersport conversion. (Which is = PP)=20 Van's is doing comparison flying against the lycomings, or may have = finished=20 already. To be published in the RVator newsletter. They posted that they = loved=20 the performance. Powersports conversion is expensive, and they need = to work=20 on the radiator layout. The performance IS good however. 
 
The = article was=20 published a couple months ago.  Sadly, they only barely beat = the 180=20 HP factory RV-8 in climb to 8000 ft.  One beat it by 15 = seconds, the=20 other by 8 seconds.   For top speed, the PS = engines ran 183=20 and 180 kts, and the 180 HP factory plane ran 179 kts.  The PS=20 engines burned considerably more fuel, and were quite a bit=20 louder.  
 
I'd bet = Tracy's Renesis,=20 with an MT C/S prop (since they had them), in an RV-8 would kick there=20 ass.  I would also bet that Lynn, Leon, or Bruce could easily build = a=20 mildly ported 13B that would run just as strong as the "215 HP" = powersports=20 engines. 
 
 If your timing on the PP isn't super radical you = shouldn't have=20 any idle problems.  
 
I guess this would be true, but when you = eliminate=20 timing overlap, don't you also eliminate most of the power = advantage?  It=20 just seems like a mild mannered PP is a waste of time, UNLESS it's = the only=20 means to an end, such as in Richard and George's custom side plated=20 production.   
 
Remember all the early = rotary=20 engines were PP! 
 
I've heard = the=20 stories.  Interesting how they quickly went away from that=20 configuration  :-)
 
As I = mentioned earlier,=20 I'm NOT a rotary engine expert, and I've never even seen a PP run.  = At my=20 level of experience, the smartest thing I can do is listen to the people = who=20 have years of experience.   There are a lot of new, = impressionable=20 folks lurking on this list, and I don't want them to get the idea that a = homemade PP engine is automatically going to be better than the stock = side=20 port.  It "might" be, but there's no evidence of it that I've seen=20 yet.   
 
Cheers,
Rusty = (someone has to=20 play the villain)   
  
 
 
------=_NextPart_000_0001_01C5773C.38A7A0A0--