From: " Lehanover@aol.com" <flyrotary@lancaironline.net>
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Full-name: Lehanover
Message-ID: <c718c.5244be7a.4776fd6a@aol.com>
Date: Thu, 28 Dec 2017 21:07:39 -0500
Subject: Re: [FlyRotary] Re: Cooling Issues
To: flyrotary@lancaironline.net
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Are these cooling tests being done at speed, say 60 to 70 MPH? Or, =20
stationary?  It only needs to cool long enough to get to the runway. Put=
  some=20
tufts on wires right behind the prop and long enough to get into the  duct=
ing. I=20
bet almost nothing flows into the ducting. Mount a pancake fan behind  the=
=20
radiator to cool on the ground. Some of the spiral flow from the prop will=
 =20
defeat the straight sides of the ducting. Ram air at flying speed is=20
completely  different. Most added temperature shows up in the oil with hig=
h power=20
settings.  The racer cooling at low speed is just not adequate. But once=
 you=20
hit the first  straight and go over 100 MPH
(top speed 146) the cooling is great. Make one change at a time. Make it=
 a =20
big change. Record the instruments on video. Just like running the dyno.=
=20
Run a  bit rich on the ground. Say 1600 degrees or less EGT. This will hel=
p a=20
bit.=20
Lynn E. Hanover
=20
=20
In a message dated 12/28/2017 7:55:29 P.M. Eastern Standard Time, =20
flyrotary@lancaironline.net writes:

Steve

I suspect it=E2=80=99s #2. Steve B=E2=80=99s email has a wealth of  inform=
ation and points=20
to airflow. To prove it layup a quick but reasonable  shaped duct and test=
=20
it with the cowl off. I would start with a 28 sq or large  inlet. 30% of=
 the=20
core face would be a good place to start testing. =20

I=E2=80=99ve only seen Tracy takeoff in the RV8 once. But he was not using=
 =20
anywhere near full throttle. He did a lot of work on the inlets but I=E2=
=80=99m not  sure=20
he can use all 300HP in the summer.  =20

Bobby


Sent from my iPad

> On Dec 28, 2017, at  5:13 PM, Stephen Izett stephen.izett@gmail.com =20
<flyrotary@lancaironline.net> wrote:
>=20
> Hi Guys
> =20
> Thanks for the replies
>=20
> Our water inlet is small  (Standard Glasair) - modelled of Tracy=E2=80=
=99s RV8=20
20b=20
> I understood he had  a round right cheek inlet of 5.25=E2=80=9D giving=
 him 22=20
in^2 to his water rad for  300hp in Florida temps.=20
> For the two rotor -> 2/3rd of 22 is  <15. We have >16 for <200hp
>=20
> My concern is the delta  T=E2=80=99s.
> Yesterday at 1800rpm I was seeing 12F across oil and 6F across  the=20
water. Previously I=E2=80=99d seen this as high as 18F and 9F not sure why=
 so low =20
yesterday.
> What do others see on the ground at idle?
> Does  anyone have good pressure data on the ground. Idle and power=20
settings?
> =20
> Are these low due to:
> 1. Water flow due to cooling system  design or air trapped.
> 2. Air flow due to small inlet, compounded by a  prop that doesn=E2=80=
=99t have=20
much blade near the spinner.=20
>=20
> I=E2=80=99ll  look at some further baffling of the Rad to exit but cant=
 see this=20
helping at  idle air speeds unless I duct the exit low pressure direct to=
=20
the back of the  core.
>=20
> I=E2=80=99ll send further photos
> Thanks
>  Steve
>=20
> Steve<3.JPG>
> <Cowl  exit.jpg>

--
Homepage:  http://www.flyrotary.com/
Archive  and UnSub:   =20
http://mail.lancaironline.net:81/lists/flyrotary/List.html


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<META name=3DGENERATOR content=3D"MSHTML 11.00.9600.18860"></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR:=
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bottomMargin=3D7 leftMargin=3D7 rightMargin=3D7 topMargin=3D7><FONT id=3Dr=
ole_document=20
color=3D#000000 size=3D2 face=3DArial>
<DIV>Are these cooling tests being done at speed, say 60 to 70 MPH? Or,=20
stationary?&nbsp; It only needs to cool long enough to get to the runway.=
 Put=20
some tufts on wires right behind the prop and long enough to get into the=
=20
ducting. I bet almost nothing flows into the ducting. Mount a pancake fan=
 behind=20
the radiator to cool on the ground. Some of the spiral flow from the prop=
 will=20
defeat the straight sides of the ducting. Ram air at flying speed is compl=
etely=20
different. Most added temperature shows up in the oil with high power sett=
ings.=20
The racer cooling at low speed is just not adequate. But once you hit the=
 first=20
straight and go over 100 MPH</DIV>
<DIV>(top speed 146) the cooling is great. Make one change at a time. Make=
 it a=20
big change. Record the instruments on video. Just like running the dyno.=
 Run a=20
bit rich on the ground. Say 1600 degrees or less EGT. This will help a bit=
.=20
</DIV>
<DIV>Lynn E. Hanover</DIV>
<DIV>&nbsp;</DIV>
<DIV>
<DIV>In a message dated 12/28/2017 7:55:29 P.M. Eastern Standard Time,=20
flyrotary@lancaironline.net writes:</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT=20
  style=3D"BACKGROUND-COLOR: transparent" color=3D#000000 size=3D2=20
  face=3DArial>Steve<BR><BR>I suspect it=E2=80=99s #2. Steve B=E2=80=99s=
 email has a wealth of=20
  information and points to airflow. To prove it layup a quick but reasona=
ble=20
  shaped duct and test it with the cowl off. I would start with a 28 sq or=
 large=20
  inlet. 30% of the core face would be a good place to start testing.=20
  <BR><BR>I=E2=80=99ve only seen Tracy takeoff in the RV8 once. But he was=
 not using=20
  anywhere near full throttle. He did a lot of work on the inlets but I=E2=
=80=99m not=20
  sure he can use all 300HP in the summer.&nbsp;=20
  <BR><BR>Bobby<BR><BR><BR><BR>Sent from my iPad<BR><BR>&gt; On Dec 28, 20=
17, at=20
  5:13 PM, Stephen Izett stephen.izett@gmail.com=20
  &lt;flyrotary@lancaironline.net&gt; wrote:<BR>&gt; <BR>&gt; Hi Guys<BR>&=
gt;=20
  <BR>&gt; Thanks for the replies<BR>&gt; <BR>&gt; Our water inlet is smal=
l=20
  (Standard Glasair) - modelled of Tracy=E2=80=99s RV8 20b <BR>&gt; I unde=
rstood he had=20
  a round right cheek inlet of 5.25=E2=80=9D giving him 22 in^2 to his wat=
er rad for=20
  300hp in Florida temps. <BR>&gt; For the two rotor -&gt; 2/3rd of 22 is=
=20
  &lt;15. We have &gt;16 for &lt;200hp<BR>&gt; <BR>&gt; My concern is the=
 delta=20
  T=E2=80=99s.<BR>&gt; Yesterday at 1800rpm I was seeing 12F across oil an=
d 6F across=20
  the water. Previously I=E2=80=99d seen this as high as 18F and 9F not su=
re why so low=20
  yesterday.<BR>&gt; What do others see on the ground at idle?<BR>&gt; Doe=
s=20
  anyone have good pressure data on the ground. Idle and power settings?<B=
R>&gt;=20
  <BR>&gt; Are these low due to:<BR>&gt; 1. Water flow due to cooling syst=
em=20
  design or air trapped.<BR>&gt; 2. Air flow due to small inlet, compounde=
d by a=20
  prop that doesn=E2=80=99t have much blade near the spinner. <BR>&gt; <BR=
>&gt; I=E2=80=99ll=20
  look at some further baffling of the Rad to exit but cant see this helpi=
ng at=20
  idle air speeds unless I duct the exit low pressure direct to the back=
 of the=20
  core.<BR>&gt; <BR>&gt; I=E2=80=99ll send further photos<BR>&gt; Thanks<B=
R>&gt;=20
  Steve<BR>&gt; <BR>&gt; Steve&lt;3.JPG&gt;<BR>&gt; &lt;Cowl=20
  exit.jpg&gt;<BR><BR>--<BR>Homepage:&nbsp; http://www.flyrotary.com/<BR>A=
rchive=20
  and UnSub:&nbsp;&nbsp;=20
  http://mail.lancaironline.net:81/lists/flyrotary/List.html<BR></FONT></B=
LOCKQUOTE></DIV></FONT></BODY></HTML>
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