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If this has been answered later, then I apologize. (Only 205 old
messages to go.)
The EM2 gets fuel flow and rpm data from the primary injector on rotor
1. If you turn off the secondary injectors the EM2 doesn't know that,
it just knows the pulse width is wider and will give it's calculation
of fuel flow based on pulse width. Fuel flow would indicate double
actual flow. Since hp is calculated from fuel flow, that would double
also. Turning off primary injectors should make fuel flow read zero
on the EM2.
I saw the double rpm on my EM2 also, and my best guess is that when the
pulse width is doubled, there is a glitch in the middle of the pulse
that makes it look like two pulses. I think I asked Tracy about it,
but don't remember what he said. Again, turning off primaries should
make the rpm read zero.
Bob W.
On Wed, 24 Jun 2009 18:38:08 -0400
"Bill Bradburry" <bbradburry@bellsouth.net> wrote:
> 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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> database 3267 (20080714) __________
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--
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