Tracy,
Thanks for the update. I need to
make certain everything is wired correctly when I replace the switches. I
also may have had both switches fail over the last many years and just didn’t
recognize it.
Sorry about the hip, hopefully the
replacement with make your life better. My dad had both his knees
replaced and it completely changed his world. He had been in pain for
years and suddenly no pain!
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Wednesday, January 20, 2016
12:55 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
Steve’s
description of how the EC2/3 works was correct.
Many
get this bit confused but The intention with the disable switch was to
use a DPDT switch for the disables. When in the disable position,
the other pole of the switch is used to activate (switch to ground) the Cold
Start input to the EC2/3 at the same time. This eliminates having to turn
off the CS switch when disabling a set of injectors and enables the EC2 to
operate on either set over the full range of manifold pressures. The
EC2/3 is able to see when you have disabled the primaries and operate the
secondary’s even though engine is operating below stage point.
I’ve
been out of touch lately and will be for awhile. Need to have my hip
replaced (again).
Tracy
Sent from Mail for Windows 10
Steve,
I think my engine dies and has little
effect when I turn off the primary and secondary respectively. I will
have to investigate this when I get the switches replaced (I plan to replace
both) I may have something miswired??
It is cold, maybe Tracy
is back in Florida
and will chime in.
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Wednesday, January 20, 2016
12:32 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
Bill,
I have tested the
injector disable function with my EC2's. With the power interrupted to
the primary injectors and the cold switch on, the engine runs on the secondary
injectors at MAP below the staging threshold. I don't know the details of
how the controller treats the cold switch, but it is possible that with the
cold switch on, the controller increases the fuel flow by using both the
primary and secondary injectors at MAP below the staging threshold, and doubles
the injector pulse width at MAP above the staging threshold. I remember
investigating this when first using the controllers but don't remember the
exact details. My backup system does work at low MAP.
Steve
From: Rotary motors
in aircraft <flyrotary@lancaironline.net> on behalf of
Bill Bradburry <flyrotary@lancaironline.net>
Sent: Wednesday, January 20, 2016
11:15 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
Bobby,
I am sorry I was not
clear and the reason was that I was not clear myself.
The injector disable
switches are for in case you lose an injector in flight and the engine starts
to run on only one rotor. You can disable either of the primary or
secondary injectors which will take the failed injector out of the circuit.
Tracy says you should test this to make sure that it works. That
is where my question came from. You can only test the disable switches
when the engine is not staged. If the engine is staged, and you turn off
the primary injectors, the engine will die because the secondary injectors are
not running, and if you turn off the secondary injectors, the engine will run
rich because you turned on the cold start but the secondaries were not running
anyway.
I am not sure what would
happen if you lost a primary injector in flight, disabled the primary
injectors, then reduced power to the staging point in order to land??? I
suspect all would get quiet! :>(
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Wednesday, January 20, 2016
11:35 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
Bill,
I’m not sure I
understand the question. If your referring to my “center off switch
position” it’s not used in flight. Intentionally anyway J
It’s used to shut down the engine. Primary injector switch of course.
Same switch used for both primary and secondary injectors.
Bobby
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Wednesday, January 20, 2016
10:55 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: What do
you think may be happening?
Changing the subject a
minute…How do you disable the secondary’s when the engine is
staged?? They are not running anyway???
Bill