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From: <cardmarc@charter.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: To Lynn Hanover re: windage trays
Date: Mon, 9 May 2005 9:36:44 -0400
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I believe all the FD pans (1993+) have the anti-slosh/foaming shield built in as stock.
Marc
> From: Lehanover@aol.com
> Date: 2005/05/06 Fri PM 10:07:24 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: To Lynn Hanover re: windage trays
> 
>  
> In a message dated 05/06/2005 06:44 Central Daylight Time,  
> jerryhey@earthlink.net writes:
> 
> Lynn, I  would appreciate your advice.  I am starting out to build 
> wedge oil  pans and wonder about the advisability of having a windage 
> tray at all  since they are not used stock 13-B or Renesis.   The 
> Renesis oil  pan has a sub floor about .75 inches above the actual real 
> bottom where  oil can be trapped and presumably de-frothed.   This 
> might only  be necessary because the pan is so shallow.  I don't know 
> and am  looking forward to hearing your comments.   The wedge oil pans  
> would be much deeper toward rear and that is where I hope to place the  
> pick up.    Thanks,  Jerry
> 
> 
> 
> 
> 
> The primary reason for the windage tray in rotary racing with the internal  
> pump, is to keep the entire oil supply from filling up the front cover  and 
> uncovering the pickup under hard braking. 
>  
> I have thought about the problem of keeping the pickup covered during climb  
> and descent. 
> How much of a climb angle would be tolerated before a problem develops.  
> Riding down to Sun&Fun in the Bonanza I decided the angles involved were  just too 
> shallow to be a factor.
>  
> That only leaves the defoaming as a benefit. We were racing without a tray  
> for years before adding one. During a race (40 minutes) the oil pressure would  
> drop from 85-90 PSI to 70 PSI.
>  
> Some of that from oil temps going up, and some from oil foaming. We were  
> putting it up into the front cover under braking and foaming the crap out of it  
> with the front counter weight. This is with a stock pan with a quart of oil  
> extra added.
>  
> A conical shaped pan with the pickup at the inverted apex would seem close  
> to the ideal if you maintain the internal pump. If you want the tray for  
> defoaming I would suggest a flat plate with a 5/8" gap around the edges the full  
> size of the pan. Or try the deep pan without any tray at all. If you don't use  
> steep climb angles the oil will stay off of the front counter weight and  
> little foaming will occur. Most foaming in the straight line is cooling oil  from 
> the rotors, and that exits at an angle before it gets to the pan and is  just 
> below the breather port.
>  
> Lynn E. Hanover 
>  
> 
>