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Message
I'm not out of retirement yet! These things may just
be a money hole {:>).
The simple one uses the pulse duty cycle technique - it
doesn't know (or care about staging). So the fuel flow at idle (before
staging) will be double (assuming your are using 2 injectors before staging and
4 after staging) that when all injectors are staged. However, at
idle, there is not a whole lot of interest in fuel flow and while
it will be double the actual, it will change to reflect changes in
A/F. You could divided it by 2 - provided you remembered to bring
your calculator. {:>)
The simply one does not have a fuel totalizer - just not
possible with this approach. Well, I guess you could put in a circuit to
integrate the instantaneous flow rate over some time period - but
then the simple one starts not to be so simple anymore {:>)
On the more advanced Monitor , I was working on a
circuit to detect when there were no pulses on the secondary injectors
indicating that staging had not yet occurred and to divide the fuel flow rate in
half.
However, the EC2 puts out a staging flag for the EM2 that
I can more easily use to do the same thing.
Either one would work on a Subaru set up as long as it
uses electronic fuel injection.
Ed
----- Original Message -----
Sent: Sunday, February 11, 2007 11:53
AM
Subject: [FlyRotary] Re: Fuel
Totalizer
Simple/Inexpensive
One is a simply Fuel Flow and Air/Fuel ratio (LED)
indicator in a package small enough to fit in the 2 1/4" instrument
hole. But, that is all the information it will provide - Fuel Flow
and Air/Fuel Ratio. This will be the cheaper version. This will
have a 10 segment LED bargraph for the Air/Fuel Ratio and a 3.5 digit LCD
readout for the Fuel Flow.
Hi
Ed,
Good
to see you're giving up retirement. This will give you something more
productive to do that cleaning up goose crap at the airport
:-)
I
would imagine you will be able to sell quite a few of these simple
versions to the Subaru folks that are using fuel injection. With that in
mind, I'd suggest allowing for single injector (rather than staged injector)
operation. At least I don't think the Subaru guys run staged
injectors.
Speaking of Subaru's, I have to admit that they sure run
well in the gyro world. The Subaru is running on nearly all
the two place gyros, and they just don't seem to be having any problems,
even though they run high power virtually all the time. The
gyro I'm training in has 1400 hours on it's engine! I'm not
about to convert, but I can't help but be
impressed.
Cheers,
Rusty
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