Robert,

 

Upper rpm is really limited by prop selection. I have an electric MT constant speed prop and I use 7000 rpm as a maximum rpm. I can reach 7500 + rpm but that’s out of my comfort zone.

 

Bobby

 

 

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, September 21, 2018 1:16 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: ECU - Megasquirt geared towards planes

 

I apologize for this dumb question, but what engine RPM are you guys turning for say takeoff? Max power situations?

 

Thanks, 

 

On Thu, Sep 20, 2018, 6:27 PM Ernest Christley echristley@att.net <flyrotary@lancaironline.net> wrote:

For those that don't know what we're talking about, the MS provides multiple ways to determine how much fuel to add at any particular time.  MAP and throttle position sensor is used mostly, but throttle position and RPM is better for low RPM/low power operations.  Even slight perturbations in manifold pressure, mostly resulting from sensor noise, have large effects and works against a smooth idle.  So, it gives you two tables, and a way to transition from one to the other as power increases.

 

I used the blending feature and it worked well.  I will say that initially working my mind around what was going on was difficult, but that was more of dealing with the engine complexity than the software complexity.  Maybe it is just hindsight, and things looking rosy after you've been through the fire, but this is actually no more confusing than saying that you have to get both ignition timing and mixture correct.  Trying to fix one while ignoring the other will also result in "confusion and failure"  :-)

 

On Thursday, September 20, 2018 3:11 PM, "Bobby J. Hughes bhughes@qnsi.net" <flyrotary@lancaironline.net> wrote:

 

Ernest,

 

See below. I like the confusion and failure statement in the instructions. J

 

 

 

Bobby

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Thursday, September 20, 2018 12:42 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: ECU - Megasquirt geared towards planes

 

 

On Thursday, September 20, 2018 7:25 AM, "Bobby J. Hughes bhughes@qnsi.net" <flyrotary@lancaironline.net> wrote:

 

MS3 does not support a manual mixture control directly but it appears possible using the table blending feature. Not much information available about that feature but should be easy to test. 

 

 

The manual mixture is not supported directly, but can be added.  As I've noted before, put a potentiometer in the throttle control, and configure the cable to open the throttle fully at half travel.  The second half of travel controls mixture. 

 

I found the documentation for  the table blending feature to be adequate.  I don't see how the table blending would be useful for mixture control (not saying it isn't, just that I don't see how).  Its intended purpose is to change the type of control between low and high RPM mixture control.

 

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