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Date: Wed, 16 Mar 2005 20:42:54 -0600
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Electric water pump
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Russell Duffy wrote:

>     Another point that I'd like to bring up right now is hose sizes. I 
> often hear the statement that a car is only run on 30% power on 
> average and yet the auto manufactures use a minimum of 1 1/4" hoses 
> for coolant. But in our airplanes builders commonly use much smaller 
> hoses & fittings usually in order to use AN fittings of which I 
> believe AN16 is the largest (correct me if I'm wrong) and is only 
> 3/4". I don't understand this reasoning. I used 1 1/4" hoses up to the 
> "T" where the rads are plumbed in parallel, where I step it down to 2 
> -1"hoses. Even the "T's" were made with minimum restriction in mind. 
> If we have a higher power demand from the engine (which is always used 
> as a reason not to use EWP's), then why restrict it's coolant flow?
>  
>  Hi Todd,
>  
> If I'm not mistaken, Tracy is using 3/4" hoses???  I've been using 
> AN12 hoses, with two evap cores in series, and there has never been a 
> question of cooling the water on the RV-3, even in severe climb 
> tests.  The antique mechanical pump does have a lot of muscle, and 
> might be making up for it though, and I still haven't found a way to 
> test the EWP by itself in flight.
>  
> Cheers,
> Rusty (wondering where my font appeared) 
>  
>   

Local glitch. As I type, I get your font but in blue. When I got the 
message back from the list server, it was my normal drab black font. I'm 
pretty sure it's Bill Gates' fault.

Charlie