X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2080983 for flyrotary@lancaironline.net; Sat, 02 Jun 2007 21:39:46 -0400 Received-SPF: none receiver=logan.com; client-ip=205.152.59.73; envelope-from=rusty@radrotary.com Received: from ibm69aec.bellsouth.net ([65.6.194.9]) by imf25aec.mail.bellsouth.net with ESMTP id <20070603013909.ZMZ7379.imf25aec.mail.bellsouth.net@ibm69aec.bellsouth.net> for ; Sat, 2 Jun 2007 21:39:09 -0400 Received: from rd ([65.6.194.9]) by ibm69aec.bellsouth.net with ESMTP id <20070603013909.IPAT22414.ibm69aec.bellsouth.net@rd> for ; Sat, 2 Jun 2007 21:39:09 -0400 From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Rotary for RANS S--16? Date: Sat, 2 Jun 2007 20:39:09 -0500 Message-ID: <002a01c7a57f$fb6701d0$6e01a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002B_01C7A556.1290F9D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6822 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 Importance: Normal Thread-Index: AcelM8RhPAl+bxAQS8qWofs8h9adUwASh2YA In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_002B_01C7A556.1290F9D0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable I'm looking for a powerplant in the 130-140 hp range. Most of the = rotary conversions I've read about are higher power than that.=20 =20 Hi George, =20 You see a lot of people shooting for the 200 HP mark on typical 13B = engines, and if everything is right, they make it. I'd guess that lots of = engines start out at more like 150 HP, and only go up as the builder figures out = how to fix his original mistakes :-) =20 =20 For example, it's easy to install a short, straight intake. You can buy = it off the shelf, it's light, it fits in the cowl, BUT it won't make the = magic 200 HP, so along comes the long curved tubing and shoe horn to make it = all fit. If you read the archives, you will note that most people make = multiple intakes before they get it "right". =20 =20 In your case, you can save lots of headaches by not worrying about the = extra power that's in there. If you're really happy with 140-150 HP, then you = can take the easy road when it comes to packaging your intake and exhaust. = This power level is just loafing for the rotary, so reliability should be a given. Lower power means smaller radiators, oil coolers, etc, so the = weight can be reduced as well. =20 =20 So, it's plenty doable, but it's still a lot of work, and something you = have to really want to do. =20 =20 Cheers, Rusty =20 ------=_NextPart_000_002B_01C7A556.1290F9D0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

I'm looking for a powerplant in the 130-140 hp = range.  Most=20 of the rotary conversions I've read about are higher power than=20 that. 

 
Hi=20 George,
 
You see = a lot of people=20 shooting for the 200 HP mark on typical 13B engines, and if everything = is right,=20 they make it.  I'd guess that lots of engines start out at more = like 150=20 HP, and only go up as the builder figures out how to fix his original = mistakes=20 :-) 
 
For = example, it's easy=20 to install a short, straight intake.  You can buy it off the shelf, = it's=20 light, it fits in the cowl, BUT it won't make the magic 200 HP, so = along=20 comes the long curved tubing and shoe horn to make it all fit.  If = you read=20 the archives, you will note that most people make multiple intakes = before they=20 get it "right".    
 
In your = case, you can=20 save lots of headaches by not worrying about the extra power that's in=20 there.  If you're really happy with 140-150 HP, then you can take = the easy=20 road when it comes to packaging your intake and exhaust.  This = power=20 level is just loafing for the rotary, so reliability should be a=20 given.  Lower power means smaller radiators, oil coolers, etc, so = the=20 weight can be reduced as well.  
 
So, it's = plenty doable,=20 but it's still a lot of work, and something you have to really want = to=20 do.  
 
Cheers,
Rusty
  =



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