From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Wednesday, June 24, 2009 6:14 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 88HP vice 130 HP. [FlyRotary] Re: 295cc vs 495 cc Renesis Test[FlyRotary]

Actually, Bill, (unless Tracy recently changed it), when the cold start it turned on OR one of the injector pair is turned off, the EC2 doubles the pulse duration to the injectors.  It also does this when you are running on primaries- before staging.

 

Here is basically what happens  - at low rpm (before staging), the primary injectors  are on with a pulse duration of X.  When the EC2 stages, it of course, brings on two more injectors.  So to maintain the same fuel flow on both sides of the staging point, as the EC2 stages it chops the pulse duration in half  X / 2 because you now have twice as many injectors.  Ergo the fuel flow remains the same on both sides of the staging point.

 

Now when you turn off either pair of injectors, the EC2 similarly tries to maintain the same fuel flow whether with 2 or 4 injectors, so when a pair are turned off, the EC2 doubles the PW to the remaining 2 injectors.  Turning off a pair manually also turns on the cold start function which is what actually causes the doubling (if you have the injectors wired per Tracy’s suggestion).  The cold start switch function on the Program Control Panel also has the duty of doubling the fuel flow for those artic cold morning starts – but in this case, its doubled for both pair of injectors. So you can very easily flood you engine using the cold start switch – one of the reasons that Tracy later incorporated the “punch the program button and squirt” prime function.

 

Don’t know enough about the EM2 to offer any suggestions as to why you might see double the fuel flow – but, I’ll bet it has to do with the above switches and functions – some combination is fooling the EM2.

 

 

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Dennis Haverlah
Sent: Wednesday, June 24, 2009 3:57 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 88HP vice 130 HP. [FlyRotary] Re: 295cc vs 495 cc Renesis Test[FlyRotary]

I agree that my Renesis engine was only producing about 70-80 HP on the small red primaries.  When I run only on the primaries with the secondaries off and the
cold start line grounded my EM-2  tach RPM doubles - 4000 RPM shows up as 8000!    My fuel flow numbers and HP numbers appear also to be doubled!!   The 140 HP probably was actually 70 HP!   However - when I operate with the primaries off and the secondaries on the RPM and other data is not doubled!!  Somewhere above 7500 RPM the RPM number on the EM-2 goes to Zero (0).    Is  this due to the rev. limiter Tracy may have included?  If so - does it control engine speed by disabling  the secondaries?

After the fatality several years ago because an apparent injector may have been disabled by foreign matter, I was determined to have duel injectors and ignition for each rotor.  This morning I replaced the Renesis red 295 cc primary injectors with blue Renesis 495 cc injectors.

When running with the secondaries on  (540  cc I believe) and the primaries off I get full static power.   Because I've changed intake and injectors I will need some time to calibrate fuel flow before I can accurately report static fuel flow numbers. 

Dennis H.

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