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I had fuel trim built into my throttle.
-The control had a potentiometer that the MS used to determine where it was set.
-The push-pull cable to the throttle plate was set to be fully open when the control was at 50% travel.
-The fuel map was set so that it was butting up against lean cutoff for 50% of the control travel. After that, with the plate fully open, the control just added fuel until up to 12:1 at full travel.
It wasn't a throttle control as much as it was a power control. :-)
If this Bearhawk project happens, I'll be repeating the setup with a three rotor.
On Wednesday, February 15, 2017 5:14 PM, Bobby J. Hughes <flyrotary@lancaironline.net> 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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