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From: david mccandless <daval@iprimus.com.au>
Subject: Re: [FlyRotary] Re: Renesis oil pan
Date: Thu, 2 Jun 2005 04:44:53 +0800
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>


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>>
>> Oil (or water) capacity has NOTHING to do with cooling ability. It 
>> only increases the "inertia" of the cooling system... if you dont 
>> have enough heat dissipation through the rad or cooler, you will 
>> still overheat. A larger capacity will simply mean it takes longer 
>> for that to happen, but it WILL happen.

***** David, I agree with every word. However, it is that "inertia" 
that you refer to, that will get you to top of climb into the cooler 
air at , say, 5000 feet, and hence higher speed and lower power, 
without hitting the red line. I have noticed this effect in high 
ambient temps in summer as compared to cooler times of the year.  Most 
of the year I can fly with as little 2/3 oil capacity no problem; but 
on a hot day,say, 90 - 100F ambient, I must have a full sump to avoid 
hitting the red line at 230F, in the climb. FWIW, Dave McC
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<excerpt><excerpt>

<fontfamily><param>Verdana</param><x-tad-bigger>Oil (or water)
capacity has NOTHING to do with cooling ability. It only increases the
"inertia" of the cooling system... if you dont have enough heat
dissipation through the rad or cooler, you will still overheat. A
larger capacity will simply mean it takes longer for that to happen,
but it WILL happen.

</x-tad-bigger></fontfamily></excerpt></excerpt>

***** David, I agree with every word. However, it is that "inertia"
that you refer to, that will get you to top of climb into the cooler
air at , say, 5000 feet, and hence higher speed and lower power,
without hitting the red line. I have noticed this effect in high
ambient temps in summer as compared to cooler times of the year.  Most
of the year I can fly with as little 2/3 oil capacity no problem; but
on a hot day,say, 90 - 100F ambient, I must have a full sump to avoid
hitting the red line at 230F, in the climb. FWIW, Dave McC
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