From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Tuning
Date: Wed, 21 Oct 2020 06:25:09 +0800
References: <list-860309@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-860309@logan.com>
Message-Id: <B46B1334-2C40-47D3-9C73-55545DE9F77A@gmail.com>

Hi Matt.

We have just last week completed the 40 hours of Phase #1.
Now headed into our summer here in Perth Western Australia.=20
Our lowest average temps are 10C / 50F in July with a few days getting =
at low as 4C / 39F	=20
highest average temps are 31C / 88F in Feb with a few days maxing around =
40C / 104F

Flying in cooler conditions at present with cowl flaps fixed open our =
OIL temps are about 15C above H2O temps so we are going to enlarge the =
Oil inlet from ~9in2 to ~14in2.
Im hoping that in bringing our OIL down it will bring the H2O down a =
little also.
Then we will look into reshaping and mechanising our cowl flaps to =
enable us to controll temps while reducing cooling drag.

Also considering a prop change, We currently have an inflight adjustable =
66.5 inch Prop.
With the 2.85:1 RD1-C ratio and a chosen redline of 7500RPM our prop =
tips are travelling pretty slow - Tracy recommended the RD1-C ratio only =
for props above 72 inches.
So looking into a secondhand 72 inch MT, which makes clearance as low as =
I=E2=80=99m comfortable with.

Steve
Glasair Super IIRG Renesis 4 port RD1-C EC2/3 EM3


> On 20 Oct 2020, at 10:37 pm, Matt Boiteau mattboiteau@gmail.com =
<flyrotary@lancaironline.net> wrote:
>=20
> Steve =3D Using Megasquirt for ECU. How is your flight testing going?
>=20
> Jeff =3D I meant prop rpm. Using Neil's PSRU, which is 3.17. I just =
bumped up my idle to around 800prop (2500engine). I forgot to add, I am =
P-Port which causes a need for higher idle.=20
>=20
> Lynn =3D Idle can be that high? Usually I see rotary idle around the =
10-18 range, but that is for a car. Little different with a prop on 100% =
of the time.
>=20
> Neil =3D That is a nice idle. I forget, are you P-Port? What is your =
timing at?
>=20
> Dave =3D 35 all time? Doesn't that seem really high for rotary. Pump =
gas? Lynn was saying 24 degrees for 87 octane.
>=20
> - Matt Boiteau
>=20
>=20
> On Mon, Oct 19, 2020 at 12:11 AM Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
> Hi there Matt and all
>=20
> What computer is controlling your fuel and spark Matt?
>=20
> Ive left the timing of the EC2 on the Renesis 4 port at Tracy=E2=80=99s =
default and haven=E2=80=99t changed it but was wanting to do some =
experimenting.
> I take it that the timing setting in the EC2/3 will vary the whole =
timing curve over the rpm/load envelope.
>=20
> Cheers
>=20
> Steve Izett
> Renesis 4 port EC2 EM3 RD1-C
>=20
>=20
>=20
>=20
> > On 19 Oct 2020, at 10:21 am, Matt Boiteau mattboiteau@gmail.com =
<flyrotary@lancaironline.net> wrote:
> >=20
> > Split table.
> >=20
> > - Matt Boiteau
> >=20
> >=20
> > On Sun, Oct 18, 2020 at 10:17 PM Matt Boiteau mattboiteau@gmail.com =
<flyrotary@lancaironline.net> wrote:
> >=20
> > What AFR and timing are people running for idle, taxi, takeoff, =
climb, cruise, descent?=20
> >=20
> > idle =3D 11afr, 20 timing
> > I seem to have to be around 11afr for it to stay alive. Still trying =
to get it to idle around 600rpm, maybe bump it up to 700rpm to be =
smoother without dieing and shaking apart.=20
> >=20
> > taxi / takeoff / climb =3D 13.2afr, 28 timing
> >=20
> > cruise - not sure aft, 28 timing
> >=20
> > decent - not sure aft, 32 timing
> > Not sure what the plane likes. I tried 14afr, but the MAP really =
get's low and engine shakes. Guessing it should be more rich?
> >=20
> > I attached the timing table and split rotary table (second email). =
Not sure how to tune timing, I just want safe values for now.
> >=20
> >=20
> > - Matt Boiteau
> > --
> > Homepage:  http://www.flyrotary.com/
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>=20
>=20
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