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Date: Thu, 04 Jan 2007 20:50:12 -0600
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Ideal cooling
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al p wick wrote:

> On Thu, 4 Jan 2007 13:49:13 -0500 "Tracy Crook" <lors01@msn.com 
> <mailto:lors01@msn.com>> writes:
>
>      
>
>         Paul has done a lot to perpetuate the idea that my cooling
>         system is "marginal at best".  I still can't figure out where
>         he gets this from.  You do not fly an aircraft for 12 years
>         and 1600+ hours in Florida, fly it to the desert southwest
>         over 10,000+ foot mountains and win air races with a
>         "marginal" cooling system.  Much has been made of the 'spray
>         bar' cooling system I used when racing. 
>
> I don't know the details about your cooling system, so can't say if 
> it's marginal or not. A marginal cooling system is one that can be 
> affected by outside factors. It's a relatively new concept we learned 
> from the Japanese. If you find yourself throttling back on hot day, or 
> watching your climb rate for fear of overheating, then you have 
> marginal system. The irony is that you can fly for years with a 
> marginal system and still live to tell about it. It's also ironic that 
> you can manage a marginal system and get by. So it's real easy to 
> discount the concept.
>  
> But when you look at crashes, sure enough, you will find that suddenly 
> the odds caught up to the pilot. Distracted by the marginal system, he 
> didn't notice.... That forced landing last year was excellent 
> example. Statistically, we want robust systems that handle 
> uncontrollable outside factors. This provides a measurable drop in 
> risk. This is a new concept. It has profound effect. But you can live 
> your whole life and never appreciate the significance.
>  
> My comment on spraybar was wrong. It can be an asset, particularly for 
> initial testing. It's highly effective method and can bring extra 
> safety margin.
>
> -al wick
> Cozy IV powered by Turbo Subaru 3.0R with variable valve lift and cam 
> timing.
> Artificial intelligence in cockpit, N9032U 240+ hours from Portland, 
> Oregon
> Prop construct, Subaru install, Risk assessment, Glass panel design info:
> http://www.maddyhome.com/canardpages/pages/alwick/index.html


Virtually every type certificated aircooled aircraft that has speed 
capability beyond bush plane category has a marginal cooling system, by 
that definition.

Just a data point...

Charlie