Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 742153 for flyrotary@lancaironline.net; Wed, 16 Feb 2005 19:08:42 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.rr.com [24.74.185.127]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j1H07rkd013225 for ; Wed, 16 Feb 2005 19:07:55 -0500 (EST) Message-ID: <002601c51484$bc322a50$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] I found the power Date: Wed, 16 Feb 2005 19:07:55 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0021_01C5145A.D1D7A530" 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 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0021_01C5145A.D1D7A530 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Paul, If you are not routing outside air to your engine intake, you are giving = up power. The less dense, hot air underneath the cowling will take = 200-400 rpm away from your rotary. The NACA ducts should work well for = this application. Ed A ----- Original Message -----=20 From: Paul=20 To: Rotary motors in aircraft=20 Sent: Wednesday, February 16, 2005 6:26 PM Subject: [FlyRotary] I found the power Today I finished installing the firesleeve on the remaing fuel lines, = made some stand-offs so that the fuel lines would not be right up = against the engine, and finished hooking up and securing a few other = items. With the top cowling off, I ran the pumps for a minute, then = checked for leaks...none found. Then I started the engine and ran it = for 20 or so seconds and shut it down and reinspected for fuel leaks. = None found. I restarted and taxiied away from the hangar a bit so as to = not be as loud for others in and near the hangar and did a full power = runup. I hit 5600 static rpm's. In the past, the best I could hope for = was 5200, most of the time settling for 5100 rpm's. I taxiied back in = and installed the top cowling....max rpm's 5100. Took the top cowling = back off....max rpm's 5600. One more try....5100 with the cowling back = on. It is beginning to become more clear to me, that one of two things = are affecting rpm's. Option one is that with the top cowling on the = engine is ingesting heated air and just cannot develop the same power as = when it ingests outside unheated air. Option two is the muffler bearing = may be worn. I'm kinda leaning toward option one. I was thinking of installing two small NACA ducts on the bottom = of my cowling with two hoses coming up to feed air to my TWM = throttlebody. The NACA ducts I purchased from Van's RV (made for = cowling ventilation) already have a male outlet already molded in the = assembly, so you just slide a hose over it and secure with a clamp. Very = simple installation.(Works well for my cabin ventillation) If I recall = correctly, they are about the same size as my throttle body bore. I = wonder if I will loose much efficiency as the air goes through the = corregated hose, and if the Van's RV ventillation NACA ducts will = provide a sufficient volume of air. Of course while flying, I would have = the advantage of a little bit of ram effect as well as the ability to = suck in fresh outside air that has not been heated inside the cowling = during taxi/takeoff run. Any opinions/suggestions would of course be = much appreciated. I will discuss the vapor lock issue in the next post, = so as to not complicate responses, etc. Thanks to all who reply. Paul = Conner =20 -------------------------------------------------------------------------= ----- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.8 - Release Date: 2/14/2005 -------------------------------------------------------------------------= ----- >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0021_01C5145A.D1D7A530 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Paul,
 
If you are not routing outside air to = your engine=20 intake, you are giving up power.  The less dense, hot air = underneath the=20 cowling will take 200-400 rpm away from your rotary.  The NACA = ducts should=20 work well for this application.
 
Ed A
----- Original Message -----
From:=20 Paul=20
Sent: Wednesday, February 16, = 2005 6:26=20 PM
Subject: [FlyRotary] I found = the=20 power

Today I finished installing the = firesleeve on the=20 remaing fuel lines, made some stand-offs so that the fuel lines would = not be=20 right up against the engine, and finished hooking up and securing a = few other=20 items. With the top cowling off,  I ran the pumps for a = minute, then=20 checked for leaks...none found.  Then I started the engine and = ran it for=20 20 or so seconds and shut it down and reinspected for fuel leaks. None = found.  I restarted and taxiied away from the hangar a bit so as = to not=20 be as loud for others in and near the hangar and did a full power = runup. =20 I hit 5600 static rpm's. In the past, the best I could hope for was = 5200, most=20 of the time settling for 5100 rpm's.  I taxiied back in and = installed the=20 top cowling....max rpm's 5100.  Took the top cowling back = off....max=20 rpm's 5600.  One more try....5100 with the cowling back on.  = It is=20 beginning to become more clear to me, that one of two things are = affecting=20 rpm's.  Option one is that with the top cowling on the engine is=20 ingesting heated air and just cannot develop the same power as when it = ingests=20 outside unheated air.  Option two is the muffler bearing may be=20 worn.  I'm kinda leaning toward option one.
     I was = thinking of=20 installing two small NACA ducts on the bottom of my cowling with two = hoses=20 coming up to feed air to my TWM throttlebody.  The NACA ducts I = purchased=20 from Van's RV (made for cowling ventilation) already have a male = outlet=20 already molded in the assembly, so you just slide a hose over it and = secure=20 with a clamp. Very simple installation.(Works well for my cabin=20 ventillation) If I recall correctly, they are about the same size = as my=20 throttle body bore. I wonder if I will loose much efficiency as the = air goes=20 through the corregated hose, and if the Van's RV ventillation NACA = ducts will=20 provide a sufficient volume of air. Of course while flying, I would = have the=20 advantage of a little bit of ram effect as well as the ability to suck = in=20 fresh outside air that has not been heated inside the cowling during=20 taxi/takeoff run.  Any opinions/suggestions would of course be = much=20 appreciated.  I will discuss the vapor lock issue in the next = post, so as=20 to not complicate responses, etc.  Thanks to all who reply.  = Paul=20 Conner
   

No virus found in this outgoing message.
Checked by AVG=20 Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.8 - Release = Date:=20 2/14/2005

>>  Homepage: =20 http://www.flyrotary.com/
>>  Archive:  =20 = http://lancaironline.net/lists/flyrotary/List.html
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