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Yes to both. I think that the EC-2 can be tuned to accept the slight
difference between the two colors of injectors. If it can not, I still have
the option of installing all 4 yellow. That would mean that I would have to
increase the fuel pressure to 57 psi which I would like to avoid.
I am really interested in hearing what other Renesis fliers are using for
fuel pressure and what fuel flow they are getting on takeoff or WOT. They
should be getting a fuel flow of around 20 GPM and I am curious to know if
they are. Bill B -----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of George Lendich
Sent: Monday, June 22, 2009 7:23 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 295cc vs 495 cc was [FlyRotary] responses to
responses, not developing full power
Bill,
I guess that's yellow primary at an average of 380cc/m and blue secondary
502cc/m = 882cc/m = 441cc/m each injector.
Can you get 440cc/m injectors? (as Tracy suggests) if you can, you will have
2 injectors the same, as Ed suggests. Might make things simpler to manage.
I guess you might be saying you have the yellow and blue injectors to hand,
and wish to use what you have.
George (down under)
Here is the plan I am considering. Please feel free to comment.
In light of the fact that the fuel pressure on the Renesis should be 57 lbs in order to get the spec flow from the injectors.
I will replace the red injectors with the yellow injectors. Looking at the flow range shown in the manual, this will give a total flow of between 1656CCM and 1872CCM at the spec pressure of 57 psi. At 100% duty cycle, that should support HP of 287-324.
If I reduce the fuel pressure from 57 psi to 43 psi, that will reduce the range of the fuel flow to 1438ccm to 1626ccm. At a duty cycle of 85% that will support a HP of 212-240.
Pro's:
Plenty of fuel at a fuel pressure that allows a higher GPM and lower amp draw. (should easily provide full power on battery voltage only and will increase the no alternator range) Will allow the EC-2 secondary injector differential in Mode 6 to be cancelled. (this is only required? When the injectors are more than 50% different. They will be between 15% and 32% different depending on the range given) Should be able to lower the MAP table here to compensate?
Con's:
Do you have any yellow injectors?
I considered going to only yellow injectors. This will flow the same fuel as the stock setup, but only at the 57 psi. The only advantage here is cancelling the injector differential.
What say ye? Tracy are you gone to Co yet?
Bill B
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