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From: Hans Conser <conserreceipts@earthlink.net>
Subject: Re: [FlyRotary] Re: Fire extinguishers
Date: Fri, 26 Aug 2005 08:29:50 -0600
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>


On Aug 26, 2005, at 12:55 AM, Michael Burke wrote:

> Hi Brad, Welcome to the list.
>     I'm a newbie here myself. I just chime in when I feel strongly 
> about
> something, as in this case. Fighting fires was something I sometimes I 
> did
> for a living.
>     Yes you are correct about putting the aircraft into a dive to blow 
> the
> fire out. But you are dealing with AIR COLLED engines, so they have to 
> have
> large holes in the cowling to cool them in the first place. Several 
> problems
> I see with this, not much good if you are flying VFR at 2000ft under 
> the
> weather, or flying at 2000ft VFR under controlled airspace in a built 
> up
> area. Secondly, even if you did manage to put the fire out in a dive, 
> how do
> you prevent it from re-igniting when you level out. Not mentioning all 
> the
> inherent problems of diving earth bound at speeds excedeing the VNE.
>     The point I'm making is this. The rotary is NOT air cooled, 
> (directly
> anyway)therefore we can take a different approach in designing the 
> cowl. We
> do not need a large volume of air blasting into the cowl, because the 
> the
> radiators can be set up so that they are ducted from the outside 
> seperately.
> Granted it is much harder to acheive in a pusher.
>     The one thing you must remember about a fire in a confined area is 
> this,
> if you block the air from getting in, the fire WILL go out. With that 
> in
> mind we design our rotary powered aircraft. Everything is imposible 
> until it
> is achieved. Nothing is achived until it is attempted.
> Michael Burke.
>

Actually liquid cooled engines need a great volume of air than air 
cooled engines.  This is because the temperature differential (Delta T) 
of the aircooled engine is much greater.  In other words it takes less 
air to cool 400 degree cooling fins vs 220 degree coolant.

Hans Conser