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From: "Carl Scheid" <cscheid@charter.net>
X-Original-To: "Lancair Mailing List" <lml@lancaironline.net>
Subject: Propeller efficiency
X-Original-Date: Mon, 24 Jun 2013 11:41:52 -0500
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Our flight testing of N304R (IO550G LIV) is progressing and I=E2=80=99ve =
been using a performance spread sheet to convert test results to =
standard atmosphere and maximum weight. My approach is to guess at a =
propeller efficiency curve and then adjust lift efficiency (.65) and =
parasite drag (2.15 ft2) to match climb performance test results. =
I=E2=80=99m assuming that my 3 blade Hartzell (F7490) has the following =
parabola shaped efficiency curve: eff =3D =
-.253*(J-1.5)2 + .85 where peak =
efficiency =3D .85 at an advance ratio (J) of 1.5 and a second =
efficiency of .7 for J=3D .73. Is this reasonable for the =
Hartzell/IO550 combination? I=E2=80=99d be interested in any propeller =
performance results that have worked for a spread sheet performance =
model. Thanks, Carl Scheid
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13pt"><FONT=20
style=3D"FONT-SIZE: 11pt">Our flight testing of N304R (IO550G LIV) is =
progressing=20
and I=E2=80=99ve been using a performance spread sheet to convert test =
results to=20
standard atmosphere and maximum weight.<SPAN style=3D"mso-spacerun: =
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</SPAN>My approach is to guess at a propeller efficiency curve and then =
adjust=20
lift efficiency (.65) and parasite drag (2.15 ft<SUP>2</SUP>) to match =
climb=20
performance test results. I=E2=80=99m assuming that my 3 blade Hartzell =
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following parabola shaped efficiency curve:<SPAN=20
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p; =20
</SPAN>eff =3D -.253*(J-1.5)<SUP>2</SUP> + .85<SPAN=20
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</SPAN><SPAN=20
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</SPAN>where <SPAN style=3D"mso-tab-count: 1"> </SPAN>peak =
efficiency =3D .85=20
at an advance ratio (J) of 1.5 and a second efficiency of<SPAN=20
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the Hartzell/IO550 combination? <SPAN style=3D"mso-spacerun: =
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be interested in any propeller performance results that have worked for =
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