From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] BSFC change on staging
Date: Fri, 26 Jun 2020 11:41:09 +0800
References: <list-419279@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-419279@logan.com>
Message-Id: <907F7F45-3279-4735-8975-9B9BDF6C1AEF@gmail.com>

Hi there Steve
Thanks for your work here.=20
How do you measure the BSFC?
So you have a version of the EC software where you can still change the =
Staging point MAP.
The BSFC is ~0.5 better unstaged. Is this due to better fuel-air mixing =
or is something else at play?

Am I right in thinking that at an economy cruise, a BSFC change of 0.5 =
might yield an approx 0.9G/hr ($5/hr) of fuel saving.
That might then argue for a Staging Point at the earlier 15.5=E2=80=9D =
MAP to enable unstaged cruise rather than the locked in 20=E2=80=9D MAP =
of the current software version.

What is your thoughts and conclusion if you have reached any?

Thanks again Steve

Steve Izett

> On 26 Jun 2020, at 8:47 am, Steven W. Boese SBoese@uwyo.edu =
<flyrotary@lancaironline.net> wrote:
>=20
> I ran a test on my engine stand with staged and unstaged fuel =
injectors but with the same fuel flow and MAP.  The results are shown in =
the attached image.  The engine is a 2010 2nd generation Renesis 6 port =
from an automatic transmission car with the high RPM ports blocked off =
and stock fuel injectors.  The reduction drive ratio is 3.18:1.  The =
prop is a 3 blade 72" Warp Drive and was operating just below stalled =
RPM.  A turbo is installed but no boost was used in the test.  No =
attempt was made to operate at minimum BSFC.
>=20
> Steve Boese=20
> <BSFC.jpg>--
> Homepage:  http://www.flyrotary.com/
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