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From: "Bill Bradburry" <bbradburry@bellsouth.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
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Subject: RE: [FlyRotary] Re: 295cc vs 495 cc was [FlyRotary] responses to responses, not developing full power
Date: Mon, 22 Jun 2009 19:32:14 -0400
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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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