I think there is a much more cost effective solution for the ECU than the M4.  When I first started development of the EC1/2/3, I looked at the Megasquirt controllers but the hardware and especially the software was not at a point where I felt it was good enough.  In the 20+ years since then, MUCH progress has been made and it has developed into a much more sophisticated system. It also has the benefit of being Open Source in both software and hardware so you can customize it to your hearts content.

I’m happy with the EC2/3s on my planes but I’m using Megasquirts on new projects (hotrods mostly).  They are dirt cheap and the tuning tools for them are way more developed than even the latest version of the EC3 too.

  Bobby’s idea of using two, one each for leading and trailing ignition is a good one.  I’d do that on my planes if I were starting today.

Tracy

Sent from Mail for Windows 10

Bill,

I for one appreciate you (and Neil’s) continuing effort to develop a reliable gearbox. New rotary installs are done without this critical piece of hardware. I like Ross’s systems and dual controller philosophy as well.  Each controller has an separate CAS and each controller actively fires a set of plugs. In our case A controller would fire leading and B controller would fire trailing. Injector can be fired from either controller with a selection switch like Tracy’s. If not for Tracy EC3 I would be bugging him for an alternative. The Motec M4 has the ability to program the location of the CAS. Crip Function I believe. This opens up the possibility for dual M4’s utilizing Ross’s dual controller philosophy and possibly is injector relay box. Each M4 runs about $2000 but I do see some used ones on eBay for less than $1000.  – Ouch!

Keep us posted on the P-port and PSRU development.

Bobby

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Thursday, February 09, 2017 10:36 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: SDS EFI