From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Dyno Sheet
Date: Fri, 7 Aug 2020 07:15:01 +0800
References: <list-612444@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-612444@logan.com>
Message-Id: <1D558740-4D7B-4386-842F-A8AA4941C389@gmail.com>

Hi Guys

Thanks for all the feedback.
I think I didn=E2=80=99t explain my objective clearly enough.

Some questions:
1. Given I have variable pitch, what combination of MAP and RPM should I =
climb or cruise at? With fixed pitch I dont suppose you think in these =
terms.
So should I be Climbings at WOT & 7000rpm OR WOT & 6300rpm Best Power =
Mixture.

I think Lynn best understood my intention of trying to use the flight as =
a dyne - I didn=E2=80=99t realise the complexity of the relationship of =
mixture and timing at various settings, thanks Lynn.
I thought by keeping WOT and mixture constant I might ascertain a =
maximum efficiency combination for MAP/RPM.

I=E2=80=99d like a combination for max power. I=E2=80=99m thinking =
identified by higher fuel burn and IAS for the climb, and=20
a max efficiency/ecconomy combination for cruise identified by best =
miles per gallon.

I thought our Renesis with our modified OEM (shortened) manifold but no =
variable intake valves etc. would have a distinctive peak at =
~6400-6600rpm.

2. I=E2=80=99m finding tuning the EC2 (objective being EC provides =
constant mixture across the flight envelope) is dependant on the =
combination I choose to tune it at.=20
Eg. Tune EC2 MCT for one MAP/RPM combination, say a cruise of 18=E2=80=9D =
AND 5000 rpm, then the EC will not be able to provide a constant mixture =
if I then choose 18=E2=80=9D at 6000rpm.
My EC2 has Tracy=E2=80=99s 8 table setup but fueling requirements given =
the extra permutations provided by the variable pitch prop (climbing =
that hill - which gear should I use - 3rd 4th or 5th??)=20
appears to stretch its inherent capabilities. So I want a plan for what =
MAP/RPM I will use and then adjust/tune the EC MCT for that combination.

Thanks again guys.

Steve Izett

=20
 all is nice if you fly that combination. If I then choose ab

> On 7 Aug 2020, at 6:16 am, lehanover lehanover@aol.com =
<flyrotary@lancaironline.net> wrote:
>=20
> Your thinking is correct. Control full throttle RPM with load. Then =
experiment always at that particular RPM until you have whatever data =
point you were after. Everything affects everything so it may be that =
(for example) advancing ignition timing at one RPM adds power but at =
another RPM reduces power. A rich mixture at one RPM may increase power =
but reduce power at another RPM. To recover even similar data on =
consecutive days is difficult. The SAE has some charts that produce a =
multiplier to account for density temperature and so on. Required to =
compare results day to day. It takes a long time to collect good =
data..........
>=20
> Lynn E. Hanover =20
>=20
>=20
>=20
> =
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