REFLECTOR: Back in the air.

[Chuck Jensen]

John,
 
Another good potential explanation for relationship between higher rpm
and oil temps.  I'm tempted to put a temp TC on the inlet to the oil
cooler to test your theory.
 
Chuck Jensen 
 
 -----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of John Dibble
Sent: Monday, May 28, 2007 2:12 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Back in the air.


I see higher oil temps at higher rpms also.  I think the reason is that
the oil pump is a positive displacement pump which means the amount of
oil pumped is proportional to rpm.  The cooler can not cool a greater
flow down to the same temp as a lower flow. 

John 
SERG/Franklin 

Chuck Jensen wrote: 

	 Scott,The higher oil temp may well be from more power, but I'm
wondering if I'm actually creating a significance difference in
horsepower.  With the MP and fuel flow the same, it seems the horsepower
would be the same.  What I haven't noticed is whether there is a
noticeable fuel flow difference between 2300 and 2500 rpm.  I know that
fuel flow follows MP, but rpm, I don't know.  It would stand to reason
it would increase, thus HP is also increasing resulting in more heat.
Mmmm...I'll check next time. 

	Chuck Jensen 
	-----Original Message----- 
	From: reflector-bounces at tvbf.org
[mailto:reflector-bounces at tvbf.org] On Behalf Of Scott Derrick 
	Sent: Monday, May 28, 2007 12:52 PM 
	To: Velocity Aircraft Owners and Builders list 
	Subject: Re: REFLECTOR: Back in the air. 
	 
	Chuck Jensen wrote: 

		 One thing I have noticed is oil temps go up about 5% at
2500 rpm versus 2400, which I assume if greater friction from greater
piston travel et al.  I haven't noticed a corresponding change in CHT
because the influence of leaning can overwhelm the minor temp change, if
any, from higher rpm ops. 

	probably more from the increase in horsepower at the higher RPM
than anything else.... 

	Scott 
	  
	-- 
	
	-
	    Truth : the most deadly weapon ever discovered by humanity.
Capable of destroying entire perceptual sets, cultures, and realities.
Outlawed by all governments everywhere. Possession is normally
punishable by death.
	
	    Richard Childers
	
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