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Date: Mon, 19 Dec 2005 09:34:47 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Cooling systems
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Monty Roberts wrote:

> To put some numbers to this: A typical car airconditioner has a 5Ton 
> rating. Smaller cars may get as low as 2 to 3 tons. This is the same 
> size AC unit as your typical house.Think about sitting in a metal box 
> with a greenhouse on it with a black leather interior, black paint, a 
> huge V8 pumping out the heat and a nitwit who wants it cool NOW after 
> it's been in the parking lot in Phoenix all day at 125 deg and you 
> will understand why they are so big.
>  
> A ton is the amount of heat a */TON/* of ice can absorb (typically in 
> an hour). I think I'll stick with a 30lb Vintage air A/C unit and 
> spray bar water.
>  
> If you want an effective cooling system with ice use dry ice and a 
> cool vest like the race car guys. Don't try to cool the whole airplane.
>  
> Monty
>
Aah!  The beauty of compromising.
No, I'm not really looking for an 'effective' cooling system as 
described above.  That would require carrying around the extra 30lbs all 
year long, when there are only a few times in the summer that it would 
be absolutely necessary.  SOP on the extremely hot days will be to fly 
in the evening or wait till morning.  Get up into the cool air ASAP in 
either case.  In the corner case where it is very hot and I must go 
immediately, the few pounds of ice will only knock the worst of the edge 
off the heat.  No expectation of an office environment in the cockpit, 
just want to avoid heatstroke until I can reach the cool air up high.  
No dark interior and the canopy will probably have a slight tint, or at 
least equipped with partial sunshades; though, this is dependant upon 
not reducing visibility significantly.  (Maybe I should consider 
building a 'summer canopy'? Hmmm...)  I'm trying not to be a nitwit, but 
that may be unavoidable 8*)

Likewise, the slow drip won't be enough to see a significant drop in the 
radiator temps as soon as the water starts flowing.  But if I can spread 
it out so that I can get the evaportation phase change before it passes 
through the radiator, then I will be buying myself a small amount of 
margin for very little cost.

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