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 14:45:45 +0800
References: <list-394161@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-394161@logan.com>
Message-Id: <03535EEE-3520-40F3-A334-EC53EEA17331@gmail.com>

Hi there Le Roux.

I thought the BSFC would more realistically be around 0.55 for best =
power in the Renesis with 10:1 compression.
We burn PULP 95 unleaded.
So calculated might be in the ball park of - hp =3D 16.4 x 6.2 / 0.55 =3D =
185hp at 6800 static
As the rpm rises on takeoff I would expect the hp to rise with rpm until =
the torque curve dives faster than the RPM rise.

What numbers are others seeing and how do they compare with Lycoming =
powered RV=E2=80=99s etc.


These are the numbers I got of the web for fuel weight (so not =
confirmed).
AU PULP		6.26	lb.gal	Premium 95 Unleaded here in Western Aust
AU ULP		6.13			Standard 92 Unleaded here in =
Western Aust
AU Avgas	5.84
US Avgas	6.01=20

Cheers

Steve Izett

> On 20 Jun 2020, at 2:01 pm, Le Roux Breytenbach =
breytenbachleroux@gmail.com <flyrotary@lancaironline.net> wrote:
>=20
> =EF=BB=BF
> Steve: =46rom what  i have read, you could use this formula to =
calculate horsepower ( or more or less)
>=20
> =
https://performancedevelopments.com/fuel-flow-calculations-for-horsepower/=

>=20
> HP =3D (GPH) x 5.92 / 0.44 (BSFC)
>=20
>        16,4 (GPH)  x 5.92 ( weight of 1 pound of fuel )=20
>          devide by
>          0,44   Brake Specific Fuel Consumption BSFC.=20
>=20
>           =3D  220 Hp
>=20
> I could be wrong
>=20
> Sent from my iPhone
> Le Roux Breytenbach=20
>=20
>=20
>=20
> Sent from my iPhone
> Le Roux Breytenbach=20
>> On 20 Jun 2020, at 04:49, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
>>=20
>> =EF=BB=BFThanks Jeff and all
>>=20
>> 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?
>>=20
>> We have an electric inflight adjustable prop which may make a =
difference from those with experience with FP props.
>>=20
>> 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?
>>=20
>> 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.
>>=20
>> Your expertise and insights would be greatly appreciated.
>>=20
>> Steve Izett
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>> 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/
>>> Archive and UnSub:   =
http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>=20
>>=20
>> --
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub:   =
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