From: "William Jepson wrjjrs@gmail.com" <flyrotary@lancaironline.net>
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Date: Thu, 6 Aug 2020 09:17:08 -0700
Message-ID: <CAN=mtae0n6ZAinY_xFWkvm36=BX9Sm5-hDjsMS1dqnwP5XkH0g@mail.gmail.com>
Subject: Re: [FlyRotary] Testing best rpm power setting
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Steve,
On the dyno you will know better, but on the 4 port (stock) you should see
peak power at less than 7k. On the small port version of Powersport=E2=80=
=99s
p-port with a similar intake length they were seeing best power at about
6,500. They may have been slightly over-proped. I would expect a similar
max power with standard side ports. Or possibly even lower rpm.
Bill

On Thu, Aug 6, 2020 at 7:59 AM Stephen Izett stephen.izett@gmail.com <
flyrotary@lancaironline.net> wrote:

> Hi guys
>
> I=E2=80=99m wanting to inflight test for the best RPM for peak power of o=
ur 4 port
> Renesis with variable pitch prop (No constant speed control at present).
> On Takeoff at Full Fine we hit 6900 after a few seconds and then rpm
> builds to 7400 by 500 feet and 110 KIAS
> I=E2=80=99m wondering if we are well past the peak torque and would be be=
tter off
> at a lower rpm.
>
> Am I right in thinking the following would use the aircraft as a Dyno to
> establish rpm for best power?
>
> 1. Set up level flight (auto pilot)
> 2. Maintain WOT and constant mixture (best power - say 0.9 Lambda - 13.2
> AFR) via Wideband O2
> 3. Vary RPM in 200rpm increments for 2 minutes each setting between 5600
> and 7200 by adjusting prop pitch
> 4. Note Fuel Flow and IAS (Logged on Dynon Skyview)
>
> I=E2=80=99m thinking this would give me an indication of best RPM for hig=
hest
> power.
> Our Inlet is just under 19=E2=80=9D long, measured from the side face of =
the
> engine.
> So I=E2=80=99m thinking peak torque may be around  6400 rpm.
>
> Your insight would be appreciated.
> Thanks
>
> Steve Izett
> Renesis 4 port RD1C (2.85:1) Inflight Adjustable Prop
>
>
>
>
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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<div><div dir=3D"auto">Steve,</div></div><div dir=3D"auto">On the dyno you =
will know better, but on the 4 port (stock) you should see peak power at le=
ss than 7k. On the small port version of Powersport=E2=80=99s p-port with a=
 similar intake length they were seeing best power at about 6,500. They may=
 have been slightly over-proped. I would expect a similar max power with st=
andard side ports. Or possibly even lower rpm.</div><div dir=3D"auto">Bill=
=C2=A0</div><div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"g=
mail_attr">On Thu, Aug 6, 2020 at 7:59 AM Stephen Izett <a href=3D"mailto:s=
tephen.izett@gmail.com">stephen.izett@gmail.com</a> &lt;<a href=3D"mailto:f=
lyrotary@lancaironline.net">flyrotary@lancaironline.net</a>&gt; wrote:<br><=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">Hi guys<br>
<br>
I=E2=80=99m wanting to inflight test for the best RPM for peak power of our=
 4 port Renesis with variable pitch prop (No constant speed control at pres=
ent).<br>
On Takeoff at Full Fine we hit 6900 after a few seconds and then rpm builds=
 to 7400 by 500 feet and 110 KIAS <br>
I=E2=80=99m wondering if we are well past the peak torque and would be bett=
er off at a lower rpm.<br>
<br>
Am I right in thinking the following would use the aircraft as a Dyno to es=
tablish rpm for best power?<br>
<br>
1. Set up level flight (auto pilot)<br>
2. Maintain WOT and constant mixture (best power - say 0.9 Lambda - 13.2 AF=
R) via Wideband O2<br>
3. Vary RPM in 200rpm increments for 2 minutes each setting between 5600 an=
d 7200 by adjusting prop pitch<br>
4. Note Fuel Flow and IAS (Logged on Dynon Skyview)<br>
<br>
I=E2=80=99m thinking this would give me an indication of best RPM for highe=
st power.<br>
Our Inlet is just under 19=E2=80=9D long, measured from the side face of th=
e engine.<br>
So I=E2=80=99m thinking peak torque may be around=C2=A0 6400 rpm.<br>
<br>
Your insight would be appreciated.<br>
Thanks<br>
<br>
Steve Izett <br>
Renesis 4 port RD1C (2.85:1) Inflight Adjustable Prop<br>
<br>
<br>
<br>
<br>
<br>
<br>
--<br>
Homepage:=C2=A0 <a href=3D"http://www.flyrotary.com/" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.flyrotary.com/</a><br>
Archive and UnSub:=C2=A0 =C2=A0<a href=3D"http://mail.lancaironline.net:81/=
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.lancaironline.net:81/lists/flyrotary/List.html</a><br>
</blockquote></div></div>

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