Yeah, Ed when I said doubling the fuel flow thru the other set of injectors,
what I should have said is doubling the pulse width, but I don't think all
that other stuff is supposed to be happening.  He is getting a doubling of
his rpm, hp, fuel flow number, etc.  and that on only the one set.
Something is cockeyed??

 

Bill B   

  _____  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.

 

Ed Anderson

Rv-6A N494BW Rotary Powered

Matthews, NC

eanderson@carolina.rr.com

 <http://www.andersonee.com> http://www.andersonee.com

 <http://www.dmack.net/mazda/index.html>
http://www.dmack.net/mazda/index.html

http://www.flyrotary.com/

 <http://members.cox.net/rogersda/rotary/configs.htm>
http://members.cox.net/rogersda/rotary/configs.htm#N494BW

http://www.rotaryaviation.com/Rotorhead%20Truth.htm
<http://www.dmack.net/mazda/index.html>   _____  From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bill Bradburry
Sent: Wednesday, June 24, 2009 4:35 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 88HP vice 130 HP. [FlyRotary] Re: 295cc vs 495 cc
Renesis Test[FlyRotary]

 

Dennis,

I don't think that doubling thing is supposed to happen except for the fuel
flow thru the other set of injectors.  I certainly could be wrong tho.  I
don't know what would happen to mine above 7500 rpm because I couldn't get
there if I threw it off a cliff!  :>)

 

You lost me with the 540 CC secondaries thing at the bottom.  Did you mean
840 CC??  Your intake was similar to mine.  What did you do to change it?

 

What is full static power?

 

Bill B  

  _____  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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