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Date: Wed, 9 Feb 2005 08:15:25 -0800 (PST)
From: Tom <tomtugan@yahoo.com>
Subject: Re: [FlyRotary] Ellison, the missing piece
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-721360@logan.com>
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I'm under the impression I have an answer.
 
Isn't there a law of motor performance that says that two motors putting out the same horsepower are consuming the same amount of air&fuel, assuming efficiency differences were not significant?
 
So if you had a 13b and a O-360 putting out the same horsepower for a single given 1 revolution of the propeller, they should be consuming the same amount of air and fuel during that 1 propeller revolution. (I THINK chosing 1 propeller rpm is a correct standard)
 
Bill pointed out that the 13b operates at a higher rpm, and we know that there's more combustion charges consumed by the 13b to make that 1 prop rpm.  
 
The difference, the missing piece, each 13b combustion charge consumes a SMALLER amount of fuel/air than the piston powerplants less frequent combustion charge.   ???   So the 13b burns a smaller amount more frequently.   ???
 
If this is all true, then the Ellison isn't on the trash heap yet. 
 
Tom

WRJJRS@aol.com wrote:
Group,
 I want to remind everyone about how much a priority the large volume inlets are to us. I believe Ed Anderson was mentioning in one of his posts how difficult it can be to get a MAP signal in the airbox of one of our PP engines. This is a perfect indication of why the smaller throttle bodies used on some of the slow turning engines will kill our HP. 

		
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<DIV>I'm under the impression I have an answer.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Isn't there a law of motor performance that says that two motors putting out the same horsepower are consuming the same amount of air&amp;fuel, assuming efficiency differences were not significant?</DIV>
<DIV>&nbsp;</DIV>
<DIV>So if you had a 13b and a O-360 putting out the same horsepower for a single given 1 revolution of the propeller, they should be consuming the same amount of air and fuel during that 1 propeller revolution. (I THINK chosing 1 propeller rpm is a correct standard)</DIV>
<DIV>&nbsp;</DIV>
<DIV>Bill pointed out that the 13b operates at a higher rpm, and we know that there's more combustion charges consumed by the 13b to make that 1 prop rpm.&nbsp; </DIV>
<DIV>&nbsp;</DIV>
<DIV>The difference, the missing piece, each 13b combustion charge consumes a SMALLER amount of fuel/air than the piston powerplants less frequent combustion charge.&nbsp;&nbsp; ???&nbsp;&nbsp; So the 13b burns a smaller amount more frequently.&nbsp;&nbsp; ???</DIV>
<DIV>&nbsp;</DIV>
<DIV>If this is all true, then the Ellison isn't on the trash heap yet. </DIV>
<DIV>&nbsp;</DIV>
<DIV>Tom<BR><BR><B><I>WRJJRS@aol.com</I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">
<META content="MSHTML 6.00.2900.2180" name=GENERATOR><FONT id=role_document face=Arial color=#000000 size=2>
<DIV>Group,</DIV>
<DIV>&nbsp;I want to remind everyone about how much a priority the large volume inlets are to us. I believe Ed Anderson was mentioning in one of his posts how difficult it can be to get a MAP signal in the airbox of one of our PP engines. This is a perfect indication of why the smaller throttle bodies used on some of the slow turning engines will kill our HP. </DIV></FONT></BLOCKQUOTE><p>
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