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Date: Mon, 7 Sep 2009 20:11:47 -0400
Message-ID: <1b4b137c0909071711w11b88081o1b16334e135ff26d@mail.gmail.com>
Subject: Re: [FlyRotary] Re: At long last, Second Flight
From: Tracy Crook <tracy@rotaryaviation.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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After plugging the connection to the EFIS1 Pitot port I made another flight
today.  The OAT was about 8 degrees cooler so - surprise  - my oil & coolant
temps were about 8 degrees cooler too.  That and a working ASI made this
flight a lot more comfortable.

I did collect a little more data this time but now I really see the value of
data logging.   Back on the ground I constantly find myself wishing I had
written down a different sensor reading under a different condition.

The air temps I'm measuring under the cowl are much hotter than I want to
see, probably due to insufficient CFM of cooling air.  I haven't measured
the pressure recovery in my diffusers but indications are that they aren't
going to be what I was hoping for.  Either that or the pressure under the
cowl is much too high.   Always in need of more data.  Next flight will be
made with the dynamic pressure port probe in place under the cowl.

I'm still a little concerned about the high turning resistance of my 20B
engine when hot.  When cool, it feels normal.  This has not changed in 14
hours of engine run time.   Any of you other 20B users notice anything like
this.  Is there any significant difference in the way the engine feels when
pulling the prop through when hot and cold?

Tracy

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After plugging the connection to the EFIS1 Pitot port I made another flight=
 today.=A0 The OAT was about 8 degrees cooler so - surprise=A0 - my oil &am=
p; coolant temps were about 8 degrees cooler too.=A0 That and a working ASI=
 made this flight a lot more comfortable.<br>
<br>I did collect a little more data this time but now I really see the val=
ue of data logging. =A0 Back on the ground I constantly find myself wishing=
 I had written down a different sensor reading under a different condition.=
<br>
<br>The air temps I&#39;m measuring under the cowl are much hotter than I w=
ant to see, probably due to insufficient CFM of cooling air.=A0 I haven&#39=
;t measured the pressure recovery in my diffusers but indications are that =
they aren&#39;t going to be what I was hoping for.=A0 Either that or the pr=
essure under the cowl is much too high. =A0 Always in need of more data.=A0=
 Next flight will be made with the dynamic pressure port probe in place und=
er the cowl.<br>
<br>I&#39;m still a little concerned about the high turning resistance of m=
y 20B engine when hot.=A0 When cool, it feels normal.=A0 This has not chang=
ed in 14 hours of engine run time. =A0 Any of you other 20B users notice an=
ything like this.=A0 Is there any significant difference in the way the eng=
ine feels when pulling the prop through when hot and cold?=A0=A0 <br>
<br>Tracy<br>

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