flyrotary@lancaironline.net Mailing List Archive

Brian,

Rather than suggesting that you check for the possibility of insufficient fuel flow by observing the fuel pressure during a future flight, it was hoped that your either had looked at the fuel pressure at the time or have a record that you could review.

It should be possible to check the fuel flow rate by disconnecting the return line from the fuel pressure regulator and measuring the amount of fuel delivered from that line in a known time period. This could be done on the ground with minimal risk as long as precautions for dealing with the flammable fuel are taken.

In my previous message, I meant to say: The fuel flow rate indication from the EM2 probably wouldn’t be very useful for checking on this.

Steve Boese

From:	bktrub@aol.com
Subject:	Re: [FlyRotary] Re: Improved performance of my new (2009) intake manifold
Date:	Thu, 11 Nov 2010 16:05:58 -0500
To:	flyrotary@lancaironline.net

Good point, I'll check. That would seem to make sense. I do have two fuel pumps, and a huge filter/ moisture separater the size of an oil filter. I'll put a fuel pressure check on my things to check in flight.

Brian Trubee

-----Original Message-----
From: Steven W. Boese <SBoese@uwyo.edu>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, Nov 11, 2010 12:23 pm
Subject: [FlyRotary] Re: Improved performance of my new (2009) intake manifold

Brian,

If the problem occurs only after the system starts using all the injectors, insufficient flow capacity of the primary injectors should not be the cause. The flow required of them is now significantly less than it was when only the primaries were in use. In flight, the total fuel requirement would be larger at the same MAP as on the ground since the RPM is greater (assuming a fixed pitch prop). So it might be good to check for something limiting the total fuel flow. The fuel filter would be one thing that comes to mind. Did you happen to notice the fuel pressure before and after the problem shows up? The fuel flow rate indication from the EC2 probably wouldn’t be very useful for checking on this.

Steve Boese

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