Even
if the electric water pump should work, what is the reason to use one?
It would have to be less efficient. You are converting mechanical energy
to electrical energy and then back to mechanical energy? There is going
to be a loss at every conversion. So in the end you will be sapping more
energy from your engine to power the water pump, power that could be going
into your prop.
No one has claimed that it will be more efficient
by converting energy forms, but by converting to a mangeable energy form.
As mechanical energy we have only one way of controlling flow.... restriction,
which adds heat as it wastes energy. Exactly what we don't want. Removing
the thermostat will eliminate this restriction, but at the expense of uncontrolled
flow of excess coolant. This in itself is a waste of energy and it causes
the engine to operate at less than ideal temperature for optimum effiecency.
A cooler engine will produce more power, but a hotter engine will be more
efficient. Many of us operate in northern climates, where the elimination
of temperature control has a very negative effect.
An EWP allows us to use only enough energy to keep
the engine cool. The rest isn't wasted in conversion because it just isn't
converted. At all. No more than is neccesary. Nada. Zip. It also alows the
pump to deliver higher flow rates if required when the engine speed is low
but load is high, as they are not mechanicly linked. Using the electronic
controller with a variable controll wired in will also allow me to control
engine temp in flight. Running it a little cooler will provide me with extra
power, but I don't expect I'll ever need it as a turbo 13B is already alot more
than the "9" requires. But as I added alot of extra fuel capacity for long
range flights, I find the idea of bumping up the temp for a little better
economy very enticing.
Another great benifit is that I got to trade
12lbs. of mechanical pump for 2lbs of EWP & controller. While it added
the challenge of designing an adapter, it allowed me alot more flexibility
in my installation, which eliminated the need for cowl bumps.
Leon has promised us some scientific
data, but it doesn't appear to be very scientific process since Leon already
has his mind made up! Sorry Leon, just a bit sceptical, waiting for some
test data....
I'm not Leon, but since were both beating the
same drum....
Have I flown yet? No. Have you flown yet? Yes.
Succeslfuly for several years now. But I expect to fly sometime in the next
2 months and am very confident in the abilities of my system, however I
will be the first to admit that it is experimental and so subject to much
testing before proving or disproving it's success. I may end up with egg
on my face yet, but I certainly will not feel bad about it. On the contrary,
I feel very satisfied with my efforts to put an end to this speculating
over whether the EWP is a valid concept. While I hope for it's success,
I will be content either way. After all, if I just wanted a proven flying
machine, I would have just bought that old, butt ugly C-150, that I was
offered just before I decided to build.
Perry, you should definitely understand the desire
to go your own way. When you first proposed a ducted fan, you must have
raised many eyebrows. As for Leon already having his mind made up, I would
say that there are many who already have their mind made up against them,
without having any practical experience. Leon has had experience with them,
albeit in a different application.
While I won't promise detailed test data like Leon
is working on, I hope to provide some real world aircraft experience within
the next 2 months.
(hint --- I need an EM2 --soon) ;-) (I hope
I'm near the top of the list)
And I promise to report the results as unbiased
facts, so that we can individually decide if it is a success or not.
S. Todd Bartrim
Turbo 13B RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm
"Whatever you vividly imagine, Ardently desire, Sincerely believe in,
Enthusiastically act upon, Must inevitably come to pass".
I'm all for what you are doing Todd, where would we be without experimentation?
I can also see now that you are using the EWP as a sort of thermostat replacement.
Looks like you will be getting us some real world data soon in an aircraft
application, so I look forward to seeing the results.