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Message-ID: <17F4910675FD44C89B8A9117A135ADE4@willsPC>
From: "Mike Wills" <rv-4mike@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-4119286@logan.com>
In-Reply-To: <list-4119286@logan.com>
Subject: Re: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. Renesis to turbo
Date: Wed, 10 Feb 2010 18:26:18 -0800
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That's what I figured Tracy. Just hard to compare performance to know =
how I'm doing without really knowing how you or anyone else attained the =
performance they claimed. Some day I'll work up the courage to make some =
low altitude speed runs and see how it looks.

Mike


From: Tracy Crook=20
Sent: Wednesday, February 10, 2010 5:34 AM
To: Rotary motors in aircraft=20
Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. =
Renesis to turbo


Sun 100 flown at 500 ft.=20
Top speed on a normally aspirated aircraft is always best at sealevel.   =
Best fuel economy is reached up high.

Tracy


On Tue, Feb 9, 2010 at 10:45 PM, Mike Wills <rv-4mike@cox.net> wrote:

  When you guys put out these numbers (RPM, speed, etc...) would also be =
helpful to know at what altitude. I assume at or close to sea level? I =
havent yet made any speed runs at low altitude.

  Mike


  From: Tracy Crook=20
  Sent: Tuesday, February 09, 2010 5:27 PM
  To: Rotary motors in aircraft=20
  Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: =
N.A. Renesis to turbo


  Tracy, if you have the data could you give us the  RPMs you saw at the =
205 and 217.5 air speeds?

  Dennis H.=20
  Renesis RV-7A
  Austin, Tx.

  That was 209 and 217.5   =20

  the 209 mph speed was with the 2.176 drive turning a 68 - 71 prop with =
engine turning 6300 , mixture leaned to 17 gph.  On other occasions I =
could push it to 6400 at best power mixture burning 20 gph.

  The 217.5 mph was with a 2.85 drive turning a 74 - 88 prop with engine =
turning 7250.  I didn't get a good read on the fuel flow but obviously =
it would have been higher.  I remember requesting priority landing after =
the race due to low fuel.  =20

  Neither run was done at best power mixture but leaned a few gph less =
than max.

  Tracy


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3Dtext/html;charset=3Diso-8859-1 =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.7600.16490"></HEAD>
<BODY style=3D"PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: =
15px"=20
id=3DMailContainerBody leftMargin=3D0 topMargin=3D0 =
CanvasTabStop=3D"true"=20
name=3D"Compose message area">
<DIV><FONT face=3DCalibri>That=92s what I figured Tracy. Just hard to =
compare=20
performance to know how I'm doing without really knowing how you or =
anyone else=20
attained the performance they claimed. Some day I'll work up the courage =
to make=20
some low altitude speed runs and see how it looks.</FONT></DIV>
<DIV><FONT face=3DCalibri></FONT>&nbsp;</DIV>
<DIV><FONT face=3DCalibri>Mike</FONT></DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dtracy@rotaryaviation.com=20
href=3D"mailto:tracy@rotaryaviation.com">Tracy Crook</A> </DIV>
<DIV><B>Sent:</B> Wednesday, February 10, 2010 5:34 AM</DIV>
<DIV><B>To:</B> <A title=3Dflyrotary@lancaironline.net=20
href=3D"mailto:flyrotary@lancaironline.net">Rotary motors in =
aircraft</A> </DIV>
<DIV><B>Subject:</B> [FlyRotary] Re: rpm vs Power was : Throttle limits =
was Re:=20
N.A. Renesis to turbo</DIV></DIV></DIV>
<DIV><BR></DIV>Sun 100 flown at 500 ft. <BR>Top speed on a normally =
aspirated=20
aircraft is always best at sealevel.&nbsp;&nbsp; Best fuel economy is =
reached up=20
high.<BR><BR>Tracy<BR><BR>
<DIV class=3Dgmail_quote>On Tue, Feb 9, 2010 at 10:45 PM, Mike Wills =
<SPAN=20
dir=3Dltr>&lt;<A =
href=3D"mailto:rv-4mike@cox.net">rv-4mike@cox.net</A>&gt;</SPAN>=20
wrote:<BR>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0pt 0pt 0pt =
0.8ex; PADDING-LEFT: 1ex"=20
class=3Dgmail_quote>
  <DIV style=3D"PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: =
15px"=20
  name=3D"Compose message area">
  <DIV><FONT face=3DCalibri>When you guys put out these numbers (RPM, =
speed,=20
  etc...) would also be helpful to know at what altitude. I assume at or =
close=20
  to sea level? I havent yet made any speed runs at low =
altitude.</FONT></DIV>
  <DIV><FONT face=3DCalibri></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DCalibri>Mike</FONT></DIV>
  <DIV style=3D"FONT: 10pt Tahoma; font-size-adjust: none; font-stretch: =
normal">
  <DIV><BR></DIV>
  <DIV=20
  style=3D"BACKGROUND: rgb(245,245,245); -moz-background-clip: border; =
-moz-background-origin: padding; -moz-background-inline-policy: =
continuous">
  <DIV><B>From:</B> <A title=3Dtracy@rotaryaviation.com=20
  href=3D"mailto:tracy@rotaryaviation.com" target=3D_blank>Tracy =
Crook</A> </DIV>
  <DIV><B>Sent:</B> Tuesday, February 09, 2010 5:27 PM</DIV>
  <DIV class=3Dim>
  <DIV><B>To:</B> <A title=3Dflyrotary@lancaironline.net=20
  href=3D"mailto:flyrotary@lancaironline.net" target=3D_blank>Rotary =
motors in=20
  aircraft</A> </DIV>
  <DIV><B>Subject:</B> [FlyRotary] Re: rpm vs Power was : Throttle =
limits was=20
  Re: N.A. Renesis to turbo</DIV></DIV></DIV></DIV>
  <DIV><BR></DIV>
  <DIV>
  <DIV></DIV>
  <DIV class=3Dh5><FONT color=3Dblack size=3D3 face=3D"Times New =
Roman"><SPAN=20
  style=3D"FONT-SIZE: 12pt">Tracy, if you have the data could you give =
us=20
  the&nbsp; RPMs you saw at the 205 and 217.5 air speeds?<BR><BR>Dennis =
H.=20
  <BR>Renesis RV-7A<BR>Austin, Tx.<BR></SPAN></FONT><BR>That was 209 and =

  217.5&nbsp;&nbsp;&nbsp; <BR><BR>the 209 mph speed was with the 2.176 =
drive=20
  turning a 68 - 71 prop with engine turning 6300 , mixture leaned to 17 =

  gph.&nbsp; On other occasions I could push it to 6400 at best power =
mixture=20
  burning 20 gph.<BR><BR>The 217.5 mph was with a 2.85 drive turning a =
74 - 88=20
  prop with engine turning 7250.&nbsp; I didn't get a good read on the =
fuel flow=20
  but obviously it would have been higher.&nbsp; I remember requesting =
priority=20
  landing after the race due to low fuel.&nbsp;&nbsp; <BR><BR>Neither =
run was=20
  done at best power mixture but leaned a few gph less than=20
  =
max.<BR><BR>Tracy<BR></DIV></DIV></DIV></BLOCKQUOTE></DIV><BR></BODY></HT=
ML>

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