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Date: Wed, 20 Apr 2005 20:59:23 -0500
From: Jim Sower <canarder@frontiernet.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Intake plenum  HELP??
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By way of perspective, at 160 kias (~174 mph) with perfect recovery - 
all of the dynamic pressure gets transferred to the intake with no 
losses - you will pick up almost exactly 1" MAP.  At 200 kias (230 mph) 
it's just over 1.5" MAP gain.
It's like having the MAP that was available 1000' below you working for 
you where you are now.
Jim S.


Jerry Hey wrote:

> Randy,  Thanks for your comments. The purpose of the ram air is to 
> pressurize the plenum, at least that is what I am trying to do with 
> it.  Moving the ram air scoop forward is not possible.  As you can see 
> from the drawing room under the cowl goes away quickly as you move 
> forward.  There would not be room for the large air filter I am trying 
> to use.  Of course we are also talking about MY limitations.  I am 
> hoping someone will engineer a better solution.  Space and weight 
> restrictions make designing anything for an airplane a lot of fun.   
> Jerry
>
>
> On Monday, April 18, 2005, at 04:11 PM, randy echtinaw wrote:
>
>> Jerry,
>>    I know very little about this stuff, in fact all I know is what 
>> you guys have taught me but . . . It seems counter productive to me 
>> to be trying to get a boost from using ram air and then making it 
>> turn 180 degrees before entering the combustion chamber. Seems like 
>> more boost is available the straighter the ram air can travel. Would 
>> it be possible to mount your "scoop" on the side of the cowling or 
>> underneath and move it ahead  so you could get some semblance of a 
>> straight shot through the filter then into intake plenum?
>> Randy
>>
>>
>> On Apr 18, 2005, at 4:43 PM, Jerry Hey wrote:
>>
>>> Here is a drawing of an intake for filtered ram air.  It will fit 
>>> inside a Tailwind Cowl.  I have not yet figured out how it goes 
>>> together and I am hoping the considerable brain power on this list 
>>> will come to my rescue. I need to be able to service 
>>> (install/remove) the air filter.  The air filter is hose clamped 
>>> over the flange.     Jerry
>>> <Plenum 4-18. JPG.JPG> Homepage:  http://www.flyrotary.com/
>>>
>>>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>>>
>>
>>
>>>>  Homepage:  http://www.flyrotary.com/
>>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>>
>>
>
>
>>>  Homepage:  http://www.flyrotary.com/
>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>
>
>