Received-SPF: none
 receiver=logan.com; client-ip=66.180.170.33; envelope-from=crj@lucubration.com
Message-ID: <43E55D57.2030302@lucubration.com>
Date: Sat, 04 Feb 2006 21:05:11 -0500
From: Chad Robinson <crj@lucubration.com>
User-Agent: Mozilla Thunderbird 1.0.7 (X11/20050923)
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] NPG Coolant Temperature vs 50/50
References: <list-970498@logan.com>
In-Reply-To: <list-970498@logan.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Ed Anderson wrote:
> Delta T = Q/cM, now if the combined effects of c and m  provide 13% less 
> heat transfer capability than the 50/50 mixture that would indicated 
> that to carry away the same Q at the same flow rate, the delta T of NPG+ 
> would need to increase by 13%.  So if I were getting 180F with the 50/50 
> for the same Q load (and flow rate) then with NPG+,  I would expect 180 
> *1.13 = 203F.  Yet, if I understood correct we have reports  that lesser 
> temperatures results noted by users of NPG - this leaves me a bit puzzled.

I don't have the answer, but how about a hypothesis? Suppose they have a 
cavitation problem. A more viscous fluid tends to reduce the onset of 
cavitation, no? And is there any data on what pressure their system is being 
run at?

Regards,
Chad