X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.245] (HELO mail.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4365109 for flyrotary@lancaironline.net; Mon, 21 Jun 2010 13:10:57 -0400 Received-SPF: none receiver=logan.com; client-ip=66.219.56.245; envelope-from=bhughes@qnsi.net Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CB116D.3DAFA0FE" Subject: RE: [FlyRotary] Re: 13B rotary engines Disposition-Notification-To: "Bobby J. Hughes" Date: Mon, 21 Jun 2010 12:11:59 -0600 X-MimeOLE: Produced By Microsoft Exchange V6.5 Message-ID: <74120FDE88CAFE4DBDA8814BCE20A3F3208670@qnsi-mail.qnsi.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: 13B rotary engines Thread-Index: AcsRauQGA5Mxtw+rT8WYpzP3SfChAgABm9PA References: From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01CB116D.3DAFA0FE Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Steve, =20 What's the condition of the engine? Is the shaft and center iron is good condition?=20 =20 Bobby Hughes ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Steve Parkins Sent: Monday, June 21, 2010 11:53 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: 13B rotary engines lynn, my 20b is for sale with intake and coolers 2,500.00 could you pass it along thx steve parkins =20 ________________________________ To: flyrotary@lancaironline.net Date: Mon, 21 Jun 2010 12:14:46 -0400 From: lehanover@gmail.com Subject: [FlyRotary] Re: 13B rotary engines In a message dated 6/21/2010 11:03:01 A.M. Eastern Standard Time, rv-4mike@cox.net writes: =09 Thanks for the feedback Lynn. Unusual to see a "poor port design" actually aid performance. =20 Mike Wills =20 It is not obvious until you start graphing the open and close events, but the side port which uses the side of the rotor as a shutter to open and close the port, offers Mazda great latitude in port timing. In the periphery ported engine (both ports) it is impossible to arrive at zero overlap, and have an engine that will produce any power at all. The apex seal does not close off either port at all, it just valves gasses in one direction or another.=20 =20 In addition, the overlap of the periphery ported engine is far more effective flow wise than overlap in the side ported engine. One apex seal is above the intake port when the opposing apex seal is below the exhaust port. Flow between the two is unobstructed. =20 So, at low RPM you get fresh mixture leaving through the exhaust port, and combinations of burned and unburned fuel and exhaust gasses flowing partway back into the intake runners. =20 This reduces the low RPM output to the point that the engine seems quit docile, and is easy to drive around in the car, slowly, or possibly taxi in an aircraft. This would make off idle tuning data useless as there will be fuel burning right on top of the EGT probes, and unburned fuel reaching the F/A sensor. =20 =20 The engine will act along the lines of a piston engine with a long duration cam. When the engine reaches its happy RPM where all of the mixture is burning inside the engine, it will step up on the "CAM" and you will see what a good idea this was. Use slow throttle inputs until you find the "WOW" RPM, and be ready with all available rudder.=20 =20 When we first ran a factory periphery port engine, we found that there were places on the track that would not allow full throttle. This with 11" wide slicks. Thank Heaven for rev limiters. The driver reported the rear end getting real loose cresting hills and bumps. =20 Why yes it was.......... =20 Lynn E. Hanover=20 ________________________________ Hotmail has tools for the New Busy. Search, chat and e-mail from your inbox. Learn more. =20 ------_=_NextPart_001_01CB116D.3DAFA0FE Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Steve,
 
What's the condition of the engine? Is the shaft and center = iron is=20 good condition?
 
Bobby Hughes

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Steve=20 Parkins
Sent: Monday, June 21, 2010 11:53 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: 13B rotary=20 engines

lynn, my 20b is for sale with intake and coolers =20 2,500.00
could you pass it along  thx


steve parkins



  =
To: flyrotary@lancaironline.net
Date: Mon, 21 Jun 2010 12:14:46=20 -0400
From: lehanover@gmail.com
Subject: [FlyRotary] Re: 13B = rotary=20 engines

In a message dated 6/21/2010 11:03:01 A.M. Eastern Standard Time, = rv-4mike@cox.net writes:
Thanks for the feedback Lynn. Unusual to see = a "poor=20 port design" actually aid performance.
 
Mike Wills

 
It is not obvious until you start graphing the open and close = events, but=20 the side port which uses the side of the rotor as a shutter to open and = close=20 the port, offers Mazda great latitude in port timing.  In the = periphery=20 ported engine (both ports) it is impossible to arrive at zero overlap, = and have=20 an engine that will produce any power at all. The apex seal does not = close off=20 either port at all, it just valves gasses in one direction or another. =
 
In addition, the overlap of the periphery ported engine is far more = effective flow wise than overlap in the side ported engine. One apex = seal is=20 above the intake port when the opposing apex seal is below the exhaust = port.=20 Flow between the two is unobstructed.
 
So, at low RPM you get fresh mixture leaving through the exhaust = port, and=20 combinations of burned and unburned fuel and exhaust gasses flowing = partway back=20 into the intake runners.
 
This reduces the low RPM output to the point that the engine seems = quit=20 docile, and is easy to drive around in the car, slowly, or possibly taxi = in an=20 aircraft.  This would make off idle tuning data useless as there = will be=20 fuel burning right on top of the EGT probes, and unburned fuel reaching = the F/A=20 sensor. 
 
The engine will act along the lines of a piston engine with a = long=20 duration cam. When the engine reaches its happy RPM where all of the = mixture is=20 burning inside the engine, it will step up on the "CAM" and you will see = what a=20 good idea this was. Use slow throttle inputs until you find the "WOW" = RPM, and=20 be ready with all available rudder.
 
When we first ran a factory periphery port engine, we found that = there were=20 places on the track that would not allow full throttle. This with 11" = wide=20 slicks. Thank Heaven for rev limiters. The driver reported the rear end = getting=20 real loose cresting hills and bumps.
 
Why yes it was..........
 
Lynn E. Hanover 

Hotmail has tools for the New Busy. Search, chat and e-mail from your = inbox. Learn more. ------_=_NextPart_001_01CB116D.3DAFA0FE--