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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-936290@logan.com>
Subject: Re: [FlyRotary] Re: Seal Hrdness
Date: Sun, 8 May 2005 07:26:26 -0400
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Ok, Got it.  I understand now.

Well the seal I sent to Bill was  an undamaged seal (so not likely to have 
been heated by friction to that extreme) and it was  "softer" than Rusty's 
seal.  I sent both parts of the damaged seal to Tracy but uncertain whether 
he will do a hardness test.  But, you are right, likely inconclusive on the 
outcome.  But, I do believe that softer seals and sloppy slots were part of 
the damage equation.

Ed
----- Original Message ----- 
From: "BillDube@killacycle.com" <billdube@killacycle.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, May 08, 2005 12:42 AM
Subject: [FlyRotary] Re: Seal Hrdness


> At 11:17 AM 5/6/2005, you wrote:
>>Bill, not certain I am following your thought.  Are you indicating that my 
>>seals became very hot as a result of the malfunction? - please elaborate.
>
>         If your seals became cocked and jammed against the housing walls, 
> the friction might get them very hot. Perhaps red hot. If they got very 
> hot then it is possible that the hardness was reduced by this heat cycle.
>
>         My point is that unless you do a hardness test on a seal (or a 
> portion of a seal) that you are certain never became overheated, you can't 
> be sure if the lack of hardness was the cause, or the result, of the 
> engine failure.
>
>
>
>>If they did I presume you are saying that they might have had their 
>>hardness reduced by the extreme heat?   Just the failed rotor seals or 
>>both?
>
>         If the undamaged seals in the other (undamaged) rotor are soft, 
> you have found the cause of the failure. If they are all hard on the 
> undamaged rotor, you still are not 100% sure if one or more of the seals 
> on the failed rotor were soft, but it is less likely.
>
> Bill Dube <LED@Killacycle.com>
> http://www.killacycle.com/Lights.htm
>
>
>
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