BTW your recent cooling data was taken under rather benign conditions.
I want to emphasize for the new guys that liquid cooling systems are

extremely

sensitive to ambient temp. Much much more so than air cooled systems.

This is because of the temp differential. Liquid cooling systems are

limited

by the 220 degree F or so temp of the coolant so a ten degree increase

in

out

side temp makes much more of a difference than if you are dealing with
a 400 degree F air cooled cylinder head.

Paul Lamar

I certainly agree, I have noticed that I can tell when the OAT has

changed

by as little as 5F by noting the coolant and oil temps changes.  So a
relative little change in ambient temp does make a big difference to

liquid

cooled engines cooling performance.  Maybe benign by california death

valley

standards, but anytime its over 90F here with the humidity it doesn't

feel

benign {:>).  But, I'll see if any 100F days show up in the near future

and

give it another try.  So far, the data indicates I may be able to reduce

my

inlet area and still maintain adequate cooling - although I really do

not

believe I can reduce both ducts to 9 square inches inlet, but perhaps 15
square inches down from 24 for each is reasonable.

Ok, Paul in the interest of getting some data collected, I am going to
install the thermocouples and data collector and lap top and get some

data.

I normally record engine and performance data as a matter of course ever

15

minutes on every flight (going back two years), but for the data

collection,

I'll do it every 5 minutes along with any event changes (power,

altitude,

airspeed, etc.).  Besides, perhaps I can later get the GPS portion

sorted

out as well.

Ed

OK Ed thanks. When you get done send the whole works back and I will get
it working with a cheap GPS. You can leave the thermal couples in place
for future use. I can always get or make more.

All this is academic of course. IMHO the cheap and simple cooling system
is the wave of the future.

Paul Lamar

Well, shoot! Missed my chance for fame and glory {:>).  I will continue with
the project as I would like to have firmed data on what my two radiators are
doing out there.

Ed Anderson

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.