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Earnest, did you test the EDIS fallback
mode by actually 'failing' the Megasquirt? Was this on a Renesis,
or a 13B with a 36-1 trigger wheel? I've been told that the EDIS
requires a 36-1 wheel, which would rule it out as a stand-alone
solution for the Renesis (different wheel).
Charlie
On 2/15/2017 4:13 PM, Bobby J. Hughes wrote:
That
make sense. Sounds like a very simple solution. I don’t
think I would be willing to give up external fuel map trim.
I like the ability to fine tune F/A in different phases of
flight. I’m sure this method would work with the MS3 unit
and “fuel table blending”
Bobby
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Wednesday, February 15, 2017 4:57 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Rotary DFI/EFI & Ign
Options
Adding
a CAS controlled EDIS-4 would just be an ignition
backup.
The
configuration I worked out was:
-for
ignition, the MegaSquirt controlled two EDIS-4. If
either EDIS-4 failed, I had backup. If the MS failed,
the EDIS-4 would continue to run on their own in
limp-home mode.
-for
fuel, the MegaSquirt controlled the normal set of 4
injectors. O2 sensor feedback helped to set the tuning,
but mixture was controlled by manifold pressure and RPM
in normal operation. A separate, needle-valve
controlled, gravity fed line was run to the throttle
body to supply fuel in the event that the MS or
injectors failed.
Would
this configuration be a single controller
for fuel and coils?
From:
Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Wednesday, February 15,
2017 4:41 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Rotary
DFI/EFI & Ign Options
Wired
up a Fueltech ECU or the Megasquirt?
I
have, in fact, had a well running
aircraft rotary engine with a
MegaSquirt, and may again in the not
to distant future.
Bobby,
for a secondary CAS, wire up a Ford
EDIS-4 ignition controller to the
trailing plugs. You don't even have
to provide it with a control input.
It's limp-home mode is 10 degrees of
advance. Set the CAS to have 15
degrees, and your set.
Gents,
There is no doubt as I
continually say that tracy's
gear and
indeed tracy was 20 years ahead
of his time. Being computer
illiterate
I rely on others to present
something like an ECU in a ready
to go
format. For that reason I have
invested in the Fueltech ECU,
but yet to
wire in. IS there any on this
forum that has already done
this? Neil.
On 2/16/2017 8:14 AM, Bobby J.
Hughes wrote:
> I did a little MegaSquirt 3
research after Tracy's post.
Charlie's been telling me for
years he though the Megasquirt
would be a good solution. It
looks very usable for our
application. The current
firmware and feature set
supports 4 rotor, 3 rotor, older
2 rotor and Renesis engines. For
the Renesis using the stock
trigger wheel, a secondary CAS
for a second ECU can be
positioned up to 20 degrees
offset from the stock location.
This is a current firmware
limitation. Using a rotary
compatible MegaSquirt wheel,
each CAS position is fully
programmable. They don't support
an overall "Fuel Map Trim"
feature using an external
potentiometer. However they have
a "Fuel Table Blending" feature
that should accomplish the same
thing. The MS3 supports two
independent Fuel Tables and you
can use an external
potentiometer to adjust a
bending of the tables. A balance
would need to be achieved
allowing either controller to
provide full rich fuel as well
as lean cruise. My range would
be 12.5:1 to 15.8:1. May be
doable.
>
> Bobby
> (love my EC3 but would like
a second CAS)
>
>
>
> -----Original Message-----
> From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net]
> Sent: Wednesday, February
15, 2017 3:21 PM
> To: Rotary motors in
aircraft
> Subject: [FlyRotary] Rotary
DFI/EFI & Ign Options
>
> Bill, Tracy and others,
>
> I should have added that I
spoke with Ross about using his
system on the rotary just last
week so, I suspect his comment
was accurate...unless he was
juiced up on his morning coffee
as I like to be! I also suspect
Tracy is making a very good
point with the MegaSquirt
system. Challenging maybe,
difficult sure, yet in no way
impossible. I worked in
combustion at GM for over a
decade and am an instrumentation
specialist from my graduate
school days in physical science
so I have a few points of
confidence to draw from. Open
source software has become a
huge advantage to the RC users
so, I suspect the same will be
true with MegaSquirt despite
that aviation is likely to
represent a small segment for
their audience.
>
> Rick
>
> --
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