X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3321393 for flyrotary@lancaironline.net; Fri, 28 Nov 2008 13:34:17 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from computername ([75.191.186.236]) by cdptpa-omta06.mail.rr.com with ESMTP id <20081128183340.LLDY4332.cdptpa-omta06.mail.rr.com@computername> for ; Fri, 28 Nov 2008 18:33:40 +0000 From: "Ed Anderson" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Renesis fuel burn Date: Fri, 28 Nov 2008 13:33:41 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0000_01C9515D.ED9E6940" X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: AclQ6HtqBWZ6mOokTG67uw2yPiKU/QAnFgoQ In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Message-Id: <20081128183340.LLDY4332.cdptpa-omta06.mail.rr.com@computername> This is a multi-part message in MIME format. ------=_NextPart_000_0000_01C9515D.ED9E6940 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi Rino, I don't have a Renesis but, I am surprised that you could only get 11.7 GPH burn at 6400 rpm. In fact, I am surprised that you could achieve 6400 rpm at that fuel burn in a Glass Goose and still get off the water (or are you only doing land takes at the moment) - but, then that of course depends on the prop load and other factors. If fact at only 6000 rpm, 11.7 GPH would only give you an air/fuel ratio of roughly 21:1 - a very, very lean mixture especially for take off, especially from water and approx 124 HP. Are there any other indicators of performance, rate of climb, top speed? In comparison with other Glass Goose? Do you have an air/fuel ratio indicator?? My first suggested would be to calibrate your EM2. It would appear to me that its unlikely you are only producing 124 HP. What is the nominal HP one finds in a Glass Goose? What size Lycoming for example? I would hate to see you doing a lot of work only to find out that the fuel burn rate being reported by the EM2 is erroneous due to lack of calibration. Its tough know where to look for a problem or to make decisions, if you are not certain of the data. My 13B will nominally show 17-18 gph at 6000 -6200 rpm on take off roll and on a cold <40F morning has shown as much as 19-20 gph. I am using a 2.85:1 redrive - swinging a 74x88 two blade wooden prop. How much manifold pressure? What type of prop? How many blades, pitch? Adjustable in flight?? You mention 17" of runners - what distance does that measure? I always measure from the block entrance to the center of the Throttle body and then I add 2.5" for the distance from the face of the block to the actually opening to the combustion chamber. Based on that I have runners that are 22" long, but that length was my calculation for best power at around 6000 rpm. Best power at higher rpm would, of course, not need as long a runner. More details on your installation would help us try to help you. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.dmack.net/mazda/index.html _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Rino Sent: Thursday, November 27, 2008 6:32 PM To: Rotary motors in aircraft Subject: [FlyRotary] Renesis fuel burn Where can I get information on fuel burn and power for the renesis? The maximum fuel burn I can get on takeoff is 11.7 gph (reading on the EM2) at 64 00 rpm. The EM2 is not fully calibrated yet! I think I should be able to get a higher fuel burn than that. The other part of the problem. What should be the intake manifold runner length on the Renesis. Best power has to be between 6000 and 6500 rpm limited by the propeller and redrive configuration. I cannot use more than 65" dia. prop. The present runner length is 17" and I think it is not enough. Rino Lacombe Renesis powered Glass Goose __________ Information from ESET NOD32 Antivirus, version of virus signature database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ------=_NextPart_000_0000_01C9515D.ED9E6940 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi = Rino,

 

I don’t have a Renesis but, I = am surprised that you could only get 11.7 GPH burn at 6400 rpm.  In fact, I am =   surprised that you could achieve 6400 rpm at that fuel burn in a Glass Goose and = still get off the water (or are you only doing land takes at the moment) =  – but, then that of course depends on the prop load and other factors. =

 

If fact at only 6000 rpm, 11.7 GPH = would only give you an air/fuel ratio of roughly 21:1 – a  very, = very lean mixture especially for take off, especially from water and approx 124 = HP.  Are there any other indicators of performance, rate of climb, top speed? = In comparison with other Glass Goose?      Do you have an = air/fuel ratio indicator??

 

 

My first suggested would be to = calibrate your EM2.  It would appear to me that its unlikely you are only = producing 124 HP.  What is the nominal HP one finds in a Glass Goose? What size = Lycoming for example?

 

 I would hate to see you doing = a lot of work only to find out that the fuel burn rate being reported by the = EM2 is erroneous due to lack of calibration.  Its tough know where to look = for a problem or to make decisions, if you are not certain of the data.  =

 

 

My 13B will nominally show 17-18 = gph at 6000 -6200 rpm on take off roll and on a cold <40F morning has shown = as much as 19-20 gph. I am using a 2.85:1 redrive -  swinging a 74x88 two = blade wooden prop. 

 

How much manifold pressure?  = What type of prop? How many blades, pitch?  Adjustable in = flight??

 

You mention 17” of runners = – what distance does that measure?  I always measure from the block = entrance to the center of the Throttle body and then I add 2.5” for the = distance from the face of the block to the actually opening to the combustion chamber.  Based on that I have runners  that are 22” = long, but that length was my calculation for best power at around 6000 rpm.  = Best power at higher rpm would, of course, not need as long a runner. =

 

More details on your installation = would help us try to help you. 

 

Ed

Ed Anderson

Rv-6A N494BW Rotary = Powered

Matthews, NC

eanderson@carolina.rr.com=

http://www.andersonee.com

http://members.cox.net/rogersda/rotary/configs.htm#N494BW

http://www.dmack.net/mazda/index.html<= font size=3D2 face=3DArial>

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Rino
Sent: Thursday, November = 27, 2008 6:32 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] = Renesis fuel burn

 

Where can I get information on fuel burn and power = for the renesis?

The maximum fuel burn I can get on takeoff is 11.7 = gph (reading on the EM2) at 64 00 rpm.   The EM2 is not fully = calibrated yet!   I think I should be able to get a higher fuel burn than = that.

 

The other part of the problem.  What should be = the intake manifold runner length on the Renesis.  Best power has = to be between 6000 and 6500 rpm limited by the propeller and redrive configuration.   I cannot use more than 65" dia. = prop.

 

The present runner length is 17" and I think it = is not enough.

 

Rino Lacombe

Renesis powered Glass = Goose



__________ Information from ESET NOD32 Antivirus, version of virus = signature database 3267 (20080714) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

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