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".
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