Edward Klepeis wrote:
Dear Paul
If Tracy would want it. I would build a custom system
for
him instead of the system he has which doesn't work. I make the
offer he
has to say yes or no. I think Tracy's time is too
valuble
to be going round and round with a system that doesn't work
Regards Ed
Tracy Crook wrote:
Gee guys, before defining my cooling system as one which 'doesn't
work', please consider that it has been flying successfully for 11
years
and 1400+ hours. Also consider that my last Renesis
progress report was written after the first flight test (1 hour).
If
you have ever developed an aircraft engine installation, you will
appreciate that it takes a bit longer than that to optimize
things.
I haven't had a chance to update the website but I have a total of
5
hours on the Renesis and have a long list of things to do. It took
2
weeks to correct the first thing on the list (improve water
pump inlet plumbing). This has been completed and the plane is
ready
to flight test as soon as these blasted hurricanes leave. I can't
even
begin to evaluate the new intake system until all the
other squawks are addressed.
Tracy
I know how you feel Tracy, this place is a butcher block! Take your
time,
you obviously have far more experience and flight hours than anyone.
You
just continue to do it your way!
Ben Schneider
Ben Schneider
Yea Tracy... go on dribbling water all over the rads. Works like a
charm :)
Paul Lamar
yes. By all means. Keep making it look like a collection of junk
yard
parts tracy. There are too many slick outfits around selling 250 HP
subaru
engine conversion like eginfeller and crossfire. dave atkins has a
much
more professional looking installation. you don't want to
get confused with them. think how many gear boxes and computers you
would
then have to make. No time left for fooling around. J.C.
I propose a new guideline. Only those who have achieved flying rotary
installations shall be allowed the privilege of looking down from on
high and critiquing others. All in favor?
Chris Cosman
Neigh. If that was the case it would take a 100 years and untold number
of lives. During the last six and a half years we have lost two lives
in rotary powered airplane crashes by people that were not on here!
That is not good PR for rotary powered airplanes. We have a lot
of intelligent engineers (myself not included) on here who have not flown
their own airplane yet. I want to read their criticism.
Furthermore if somebody votes yes I will ignore the post.
Do I make myself completely clear?
Paul Lamar
Here is my opinion on this subject.
Tracy is doing just fine. Placing a large, heavy drag producing radiator on
an aircraft that is designed to cool at one point, a point which said
aircraft spends 1% of it's time, is a fine example of the designer being
focused on one criteria at the expense of all others. In other words, a
point design. This may be fine for a tow tug, or a STOL plane. For a cross
country capable aircraft like the RV or another fast aircraft it is a waste
of time and effort. The addition of a spray bar cooling system to get the
cooling system to work for this extreme cooling requirement is a perfectly
acceptable engineering compromise. This is not to say that it cannot be
improved. A test bed is just that, and anybody who expects a work of art or
perfection simply does not understand the development process.
Tracy, my hat is off to you,
Monty
Well in theory that is true Monty but I have been confronted several times
where I needed to climb at max angle to get over some clouds that I knew
contained rocks. One out of 100 is too often for me.
With a little more work and cowling flaps there need be no trade off
between good cooling under all conditions and low drag cruise. This newsletter
has been harping on this problem for five years or so. As I said before we
are getting there slowly. Too slowly. So far many have failed and given
up.
The thing we need to do is make sure it cools under all conditions. Then
we can add cowl flaps to reduce the drag during cruise where max cooling
is not required. I have said this probably 100 times on here so far. We are not
beyond first base yet. As far as I know only one rotary powered airplane flying
is using cowl flaps so far.
The trend is towards easier airplanes to fly. Not airplanes where
the pilot has to worry about engine cooling and whether he has to turn
on the dribble system or not. The airplane engine should be as easy to
operate as your car engine.
Our biggest problem is selling liquid cooling. I would hesitate to tell
an experienced pilot that he had to a keep a water tank full just to do
a max angle climb now and then. I think his response would be "pass".
If I were not such a rotor head and knowing what I know about liquid
cooling systems I would be one of them. Read my article on the ACRE web
site below on "How to cool your Wankel".
Paul Lamar
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