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Date: Mon, 18 Apr 2005 18:48:28 -0500
Subject: Re: [FlyRotary] Re: Apex Seal Groove Wear and Air Filters was Re: [FlyRotary]...
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From: Jerry Hey <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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On Monday, April 18, 2005, at 05:24 PM, George Lendich wrote:

>
>> Hi Ernest,  one assumption you make that I will throttle back for
>> cruise, is probably not true.  At least I have seldom done so with my
>> Continental powered Tailwind. I plan to take off full throttle and
>> cruise right around 6000 rpm which is the sweet spot (lowest bearing
>> load) for the 13B.  But your point about the complexity of the
>> switchable intake is well taken.   I prefer the idea of filtered ram
>> air and am going to see I can fit it under the cowl. It is amazing 
>> that
>> we have been  able to talk ourselves into supplying unfiltered air at
>> all.  Lot of rationalizing on that one. I am as guilty as anyone else.
>>    BTW,  a few months ago I proposed the filtering ram air  on the 
>> other
>> list and was told that filters and ram air did not go together.  I 
>> gave
>> it up at that time but here we are again.   Jerry
>
> Jerry,
> Am I wrong in thinking that a ram intake will force air through a 
> filter?
> George ( down under)

I am betting on it George.  Seems logical,  but pressure loss across 
the filter was the concern.  PL said the pressure loss would negate the 
ram air effect. I think that is a little strong.   I imagine there will 
be some performance degradation but not too much.  On the positive side 
there is Bill Jepson's report that filtered ram air is being utilized 
on motorcycles with good results. As someone else has noted, protecting 
the engine is worth a few  hp.       Jerry
>
>
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>