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Subject: Re: 20B RV-8 performance numbers
References: <list-5888450@logan.com>
From: Tracy <rwstracy@gmail.com>
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Date: Tue, 1 Jan 2013 09:52:35 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Mark S. had asked me for some performance numbers on my RV-8 at more typical=
 power settings than I normally use since I usually fly at economy settings.=
   Being an efficiency nut as well as the psychological effect of imagining a=
 $50.00 bill going out the exhaust every hour is the reason, not any concern=
 about the health of the engine.    I usually average only 5 - 6 GPH on a lo=
cal area recreational flight at speeds around 130.   Thought I'd share the r=
esults of the trial run I did for Mark with the group.


 Went on a New Year's Eve flight and tried higher power settings at close to=
 the conditions you gave me.   I have a fixed pitch prop and don't like to c=
ruise at engine speeds more than about 6000 so had to modify the settings to=
 keep them in that range.  (Mark had asked about performance at around 15 gp=
h)   One other interesting thing  I noticed was that the OAT kept increasing=
 the faster I went.   When I slowed down (at same altitude) the OAT measured=
 6 degrees lower.   My OAT sensor is located in the diffuser for the radiato=
r but not in line of sight of the core.  I don't know if the change was due t=
o rad heat finding it's way to the sensor or the result of compressing the a=
ir in front of the rad.=20

Altitude 6500
OAT  64
IAS 191 MPH
TAS (calculated) 214 MPH
GPS 4 way average - 212 MPH
MP  18.7" Hg
GPH  12.7
Engine RPM  6100

Tracy

Sent from my iPad=