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Date: Mon, 18 Apr 2005 13:10:51 -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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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


On Monday, April 18, 2005, at 09:17 AM, echristley@nc.rr.com wrote:

>
>  I am building my
>>> intake right now and it will have filtered air with the option of
>>> switching to ram air at altitude.  Do  you think this is a good
>> idea? > Certainly some dust exists even at 10,000 ft.     Jerry
>
>
> Jerry, can we examine the basic premise for a moment?
> You've stated that you'll use filtered air next to the dusty Earth and 
> unfiltered ram air at altitude. The contradiction that I'm seeing is 
> that near the dusty Earth is where you want the extra power that would 
> be supplied with the unfiltered air.  At altitude you'll be throttling 
> back for cruise power.
>
> How do you view the cost/benefit of the extra complexity of the 
> 'switchable' intake?
>
>
>>>  Homepage:  http://www.flyrotary.com/
>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>