From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] N214FL RV-4 First Flight
Date: Sun, 21 Feb 2021 07:18:28 +0800
References: <list-1238001@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Message-Id: <51D35A2B-A971-4ABA-B406-323E02BB53B4@gmail.com>

Congratulations Finn.

Some reflection from the data:
RPM=E2=80=99s only get to ~5650rpm - Is it over propped?
You appear to have been quite conservative when you pulled the power =
back with Eng temps being well below 200.
You were probably maybe making ~150hp depending on your intake length =
etc. The OT being quite low.=20
Looks like you need to collect some more data.
What is the exit area and can you measure the cowl pressures?

We are continuing to fine tuning our cooling.=20
Changes to our diffuser wedge shape has made some significant =
improvements.
We mechanised our right hand (bottom rear) cowl flap and flew the =
Glasair last week to test.
Closing the one cowl flap at 140 KTAS yielded a 5 KTAS increase and 2 =
deg C rise in H2o & Oil temps.
Based on this data we=E2=80=99ll now mechanise the left hand cowl flap =
and test.

Our experience is without doing the science and measuring pressures =
across the radiator cores we are just spitting in the dark.

Again, congratulations and thanks for your help.

Cheers

Steve Izett
Perth Western Australia
Renesis 4 port, RD1-C EC2 EM3 variable pitch Prop


> On 21 Feb 2021, at 3:25 am, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
>=20
> N214FL left the ground this morning for an 18 minute flight.
>=20
> Main concern was engine (water) cooling. As you know, cooling is a =
compromise between drag from unnecessary air through cowling and =
adequate cooling during normal flight conditions. Climbed to 1,500' =
before pulling back on throttle to see if coolant temp would stop =
rising. It did. Still, I think I erred in too small fluid inlet openings =
in the A/C evaporator cores I used for radiators. Some more work in that =
area is in my future before hot days arrive.
>=20
> Cut the flight short due to a bit of smoke (didn't smell anything) =
briefly observed low in the cockpit at full throttle later in the =
flight. To be investigated.=20
>=20
> Van's RV-4 with Mazda 13-B Renesis (RX-8) stock engine.
> RWS 2.87:1 Propeller Speed Reduction Unit
> RWS Engine Controller and Monitor (modified)
> Performance Propeller 76x88
> Empty Gross: Approx 926 lbs.
>=20
> Engine log attached. Unzip and open with Excel.
>=20
> WTALR: Water temp after left radiator
> WTARR: Water temp after right radiator
> Use EGT and CHT Ref to compare to OAT and adjust accordingly.
>=20
> Finn
>=20
>=20
>=20
>  =09
> This email has been checked for viruses by Avast antivirus software.=20=

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