From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Modifying the EC2 Staging point
Date: Sat, 20 Jun 2020 10:49:15 +0800
References: <list-390807@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-390807@logan.com>
Message-Id: <DFD1A114-AE19-437F-9B05-E0A1F445B02C@gmail.com>

Thanks Jeff and all

Last flight (after playing around with Mode #1 tuning on the ground) the =
Primaries (4 port Red) were saturating at various times, indicated as =
Steve Boese reminded me, by the loss of RPM readouts (EM3 & Dynon =
Skyview) sensed from the Primary Injector line.
Do others with small Primaries have this issue or is it a Tuning issue?
ie. Getting modes # 3,6,2 right will spread the load between the Pri and =
Secondaries so the primaries don=E2=80=99t saturate?
I do have another set of the larger (Blue) secondary injectors that =
could replace the small red Primaries giving us 4 equal injectors, if =
this was helpful.
Do injectors have a sweet spot or better spray pattern at a particular =
band of duty cycle?

We have an electric inflight adjustable prop which may make a difference =
from those with experience with FP props.

On another note, I rechecked max fuel flow at static ~6800 rpm and 0.92 =
Lambda which I think is best power. Fuel Flow peeks at 16.4 Gal/hr.
It's a Renesis 4 Port with the stock exhaust header and resonator and a =
modified stock intake manifold which is basically shortened from 23.6=E2=80=
=9D to 18.1=E2=80=9D.=20
I had noted down that Tracy recommended 16=E2=80=9D and Paul L 20=E2=80=9D=
  for the intake length.
What kind of hp do you think this might be producing and what are others =
seeing?

How could we determine peak power/rpm? Could we use the airframe as a =
dyno in some way?
What about at WOT clean air and level, and adjust prop pitch/rpm for =
maximum airspeed.
I suppose is we kept the mixture constant we could look for highest fuel =
flow.
I=E2=80=99m trying ti ascertain the best rpm for takeoff.
At the moment I=E2=80=99m leaving the prop set fine and rpm is peaking =
at ~7500 on climb out.

Your expertise and insights would be greatly appreciated.

Steve Izett


> On 19 Jun 2020, at 9:37 pm, Jeff Whaley jwhaley@datacast.com =
<flyrotary@lancaironline.net> wrote:
>=20
> I don't think you're missing anything Steve - my EC2 is the same : =
fixed at 20" ...
> It was originally 15.5" and could be set anywhere ... but after sent =
back to Tracy it is now 20" and cannot be changed.
> Jeff=20
>=20
> Hi people.
>=20
> I did some tuning this morning.
> But I couldn't get the staging point to change.
>=20
> I reset all modes to default.
> The built in default Stage Point on my EC2 seems to be ~20"
>=20
> Ran engine at the desired MAP, selected Mode #7  (I was aiming at =
15.5") and pressed the Store Button.
> I also tried holding it for a few seconds.
> Staging Point stayed at ~20".
> What am I missing here?
>=20
> Steve Izett
>=20
> --
> Homepage:  http://www.flyrotary.com/
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