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Message-ID: <1b4b137c1002101251w21b1ec99tff498ee88f9d1902@mail.gmail.com>
Subject: Re: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. 
	Renesis to turbo
From: Tracy Crook <tracy@rotaryaviation.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=00c09f99e122d3f8df047f453151

--00c09f99e122d3f8df047f453151
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I won a pretty good bet on that logic once.   The flaw is that an airfoil (=
a
prop is an airfoil) generates lift (or thrust in this case) at zero angle o=
f
attack due to mr Bernoulli's stuff.  Trying to calculate airspeed based on
those pitch numbers is a waste of time if all you have is that numerical
pitch number which is usually based on the angle at the flat side of the
airfoil.   But then again, no 2 prop makers define it the same way.

Tracy

On Wed, Feb 10, 2010 at 3:27 PM, Jeff Whaley <jwhaley@datacast.com> wrote:

>  Hey Tracy, you=92re doing better than theoretical =85
>
> 6300 engine rpm / 2.17 =3D 2903.225 prop rpm
>
> 2903.225 prop rpm x 60 =3D 174193.548 prop rph (revs per hour)
>
> 174193.548 rph x 71 inch pitch =3D 12367741.935 inches of forward travel =
per
> hour
>
> 12367741.935=94 / 12 =3D 1030645.131 feet per hour
>
> 1030645.161 fph / 5280 =3D 195.2 mph
>
> Your 209 mph appears to be better than best theoretical  =85
>
> 209 / 195.2 =3D 1.07;
>
> 1.07 x 2903.225 =3D 3108 prop rpm  / or 1.07 x 71 =3D 75.97 inch pitch =
=85 the
> following table from Warp Drive gives same numbers.
>
> 210 mph at 2900 rpm requires 76=94 pitch; or conversely 210 mph at 71=94 =
pitch
> requires 3100 rpm.
>
> Jeff
>
>
>
>
>
> *Prop RPM*
>
> *Cruise Air Speed*
>
> *2600*
>
> *2700*
>
> *2800*
>
> *2900*
>
> *3000*
>
> *3100*
>
> *3200*
>
> *3300*
>
> *3400*
>
> *3500*
>
> *3600*
>
> *3700*
>
> *3800*
>
> *3900*
>
> *4000*
>
> *4100*
>
> *4200*
>
> *220*
>
> 89
>
> 86
>
> 83
>
> 80
>
> 77
>
> 75
>
> 73
>
> 70
>
> 68
>
> 66
>
> 65
>
> 63
>
> 61
>
> 60
>
> 58
>
> 56
>
> 55
>
> *210*
>
> 85
>
> 82
>
> 79
>
> 76
>
> 74
>
> 71
>
> 69
>
> 67
>
> 65
>
> 63
>
> 62
>
> 60
>
> 58
>
> 57
>
> 55
>
> 54
>
> 53
>
> *200*
>
> 81
>
> 78
>
> 75
>
> 72
>
> 70
>
> 68
>
> 66
>
> 65
>
> 62
>
> 61
>
> 59
>
> 57
>
> 56
>
> 54
>
> 53
>
> 51
>
> 50
>
> *190*
>
> 77
>
> 74
>
> 72
>
> 69
>
> 67
>
> 65
>
> 63
>
> 61
>
> 59
>
> 57
>
> 56
>
> 54
>
> 53
>
> 51
>
> 50
>
> 49
>
> 48
>
> *180*
>
> 73
>
> 70
>
> 68
>
> 66
>
> 63
>
> 61
>
> 59
>
> 58
>
> 56
>
> 54
>
> 53
>
> 52
>
> 50
>
> 49
>
> 48
>
> 46
>
> 45
>
>
>
>
>
> *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] *O=
n
> Behalf Of *Tracy Crook
> *Sent:* Wednesday, February 10, 2010 8:35 AM
> *To:* Rotary motors in aircraft
> *Subject:* [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A=
.
> Renesis to turbo
>
>
>
> Sun 100 flown at 500 ft.
> 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 <tracy@rotaryaviation.com>
>
> *Sent:* Tuesday, February 09, 2010 5:27 PM
>
> *To:* Rotary motors in aircraft <flyrotary@lancaironline.net>
>
> *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 20=
5
> and 217.5 air speeds?
>
> Dennis H.
> Renesis RV-7A
> Austin, Tx.
>
> That was 209 and 217.5
>
> 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 cou=
ld
> 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.
>
> Neither run was done at best power mixture but leaned a few gph less than
> max.
>
> Tracy
>
>
>
> This message, and the documents attached hereto, is intended only for the
> addressee and may contain privileged or confidential information. Any
> unauthorized disclosure is strictly prohibited. If you have received this
> message in error, please notify us immediately so that we may correct our
> internal records. Please then delete the original message. Thank you.
>

--00c09f99e122d3f8df047f453151
Content-Type: text/html; charset=windows-1252
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I won a pretty good bet on that logic once.=A0=A0 The flaw is that an airfo=
il (a prop is an airfoil) generates lift (or thrust in this case) at zero a=
ngle of attack due to mr Bernoulli&#39;s stuff.=A0 Trying to calculate airs=
peed based on those pitch numbers is a waste of time if all you have is tha=
t numerical pitch number which is usually based on the angle at the flat si=
de of the airfoil.=A0=A0 But then again, no 2 prop makers define it the sam=
e way.<br>
<br>Tracy<br><br><div class=3D"gmail_quote">On Wed, Feb 10, 2010 at 3:27 PM=
, Jeff Whaley <span dir=3D"ltr">&lt;<a href=3D"mailto:jwhaley@datacast.com"=
>jwhaley@datacast.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_q=
uote" style=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0=
pt 0.8ex; padding-left: 1ex;">






<div link=3D"blue" vlink=3D"purple" lang=3D"EN-US">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">Hey Tracy, you=92re doing better than theoretical =85</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">6300 engine rpm / 2.17 =3D 2903.225 prop rpm</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">2903.225 prop rpm x 60 =3D 174193.548 prop rph (revs per hour)</span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">174193.548 rph x 71 inch pitch =3D 12367741.935 inches of forward tra=
vel per hour</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">12367741.935=94 / 12 =3D 1030645.131 feet per hour</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">1030645.161 fph / 5280 =3D 195.2 mph</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">Your 209 mph appears to be better than best theoretical =A0=85
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">209 / 195.2 =3D 1.07;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">1.07 x 2903.225 =3D 3108 prop rpm =A0/ or 1.07 x 71 =3D 75.97 inch pi=
tch =85 the following table from Warp Drive gives same numbers.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">210 mph at 2900 rpm requires 76=94 pitch; or conversely 210 mph at 71=
=94 pitch requires 3100 rpm.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">Jeff</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">=A0</span></p>
<table style=3D"width: 525pt;" border=3D"1" cellpadding=3D"0" cellspacing=
=3D"0" width=3D"700">
<tbody>
<tr>
<td colspan=3D"18" style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">
<b>Prop RPM</b></p>
</td>
</tr>
<tr>
<td style=3D"padding: 1.5pt; width: 38.45pt;" width=3D"51">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>Cr=
uise Air Speed</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.65pt; -moz-background-clip: border; -moz-background-or=
igin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>26=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.65pt; -moz-background-clip: border; -moz-background-or=
igin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>27=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.65pt; -moz-background-clip: border; -moz-background-or=
igin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>28=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.65pt; -moz-background-clip: border; -moz-background-or=
igin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>29=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.65pt; -moz-background-clip: border; -moz-background-or=
igin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>30=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.65pt; -moz-background-clip: border; -moz-background-or=
igin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>31=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.65pt; -moz-background-clip: border; -moz-background-or=
igin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>32=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.6pt; -moz-background-clip: border; -moz-background-ori=
gin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>33=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.6pt; -moz-background-clip: border; -moz-background-ori=
gin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>34=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.6pt; -moz-background-clip: border; -moz-background-ori=
gin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>35=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.6pt; -moz-background-clip: border; -moz-background-ori=
gin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>36=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.6pt; -moz-background-clip: border; -moz-background-ori=
gin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>37=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.6pt; -moz-background-clip: border; -moz-background-ori=
gin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>38=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.6pt; -moz-background-clip: border; -moz-background-ori=
gin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>39=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.6pt; -moz-background-clip: border; -moz-background-ori=
gin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>40=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.6pt; -moz-background-clip: border; -moz-background-ori=
gin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>41=
00</b></p>
</td>
<td style=3D"padding: 1.5pt; background: rgb(255, 153, 102) none repeat scr=
oll 0% 0%; width: 28.6pt; -moz-background-clip: border; -moz-background-ori=
gin: padding; -moz-background-inline-policy: continuous;" width=3D"38">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>42=
00</b></p>
</td>
</tr>
<tr>
<td style=3D"padding: 1.5pt; background: rgb(255, 255, 128) none repeat scr=
oll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -=
moz-background-inline-policy: continuous;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>22=
0</b></p>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">89</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">86</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">83</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">80</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">77</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">75</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">73</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">70</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">68</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">66</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">65</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">63</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">61</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">60</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">58</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">56</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">55</p=
>
</td>
</tr>
<tr>
<td style=3D"padding: 1.5pt; background: rgb(255, 255, 128) none repeat scr=
oll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -=
moz-background-inline-policy: continuous;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>21=
0</b></p>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">85</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">82</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">79</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><span=
 style=3D"background: yellow none repeat scroll 0% 0%; -moz-background-clip=
: border; -moz-background-origin: padding; -moz-background-inline-policy: c=
ontinuous;">76</span></p>

</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">74</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><span=
 style=3D"background: aqua none repeat scroll 0% 0%; -moz-background-clip: =
border; -moz-background-origin: padding; -moz-background-inline-policy: con=
tinuous;">71</span></p>

</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">69</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">67</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">65</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">63</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">62</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">60</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">58</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">57</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">55</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">54</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">53</p=
>
</td>
</tr>
<tr>
<td style=3D"padding: 1.5pt; background: rgb(255, 255, 128) none repeat scr=
oll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -=
moz-background-inline-policy: continuous;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>20=
0</b></p>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">81</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">78</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">75</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">72</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">70</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">68</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">66</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">65</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">62</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">61</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">59</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">57</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">56</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">54</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">53</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">51</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">50</p=
>
</td>
</tr>
<tr>
<td style=3D"padding: 1.5pt; background: rgb(255, 255, 128) none repeat scr=
oll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -=
moz-background-inline-policy: continuous;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>19=
0</b></p>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">77</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">74</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">72</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">69</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">67</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">65</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">63</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">61</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">59</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">57</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">56</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">54</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">53</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">51</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">50</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">49</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">48</p=
>
</td>
</tr>
<tr>
<td style=3D"padding: 1.5pt; background: rgb(255, 255, 128) none repeat scr=
oll 0% 0%; -moz-background-clip: border; -moz-background-origin: padding; -=
moz-background-inline-policy: continuous;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center"><b>18=
0</b></p>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">73</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">70</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">68</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">66</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">63</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">61</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">59</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">58</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">56</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">54</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">53</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">52</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">50</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">49</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">48</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">46</p=
>
</td>
<td style=3D"padding: 1.5pt;">
<p class=3D"MsoNormal" style=3D"text-align: center;" align=3D"center">45</p=
>
</td>
</tr>
</tbody>
</table>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size: 11pt; color: rgb(31, 73, 1=
25);">=A0</span></p>
<div style=3D"border-style: solid none none; border-color: rgb(181, 196, 22=
3) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium=
; padding: 3pt 0in 0in;">
<p class=3D"MsoNormal"><b><span style=3D"font-size: 10pt;">From:</span></b>=
<span style=3D"font-size: 10pt;"> Rotary motors in aircraft [mailto:<a href=
=3D"mailto:flyrotary@lancaironline.net" target=3D"_blank">flyrotary@lancair=
online.net</a>]
<b>On Behalf Of </b>Tracy Crook<br>
<b>Sent:</b> Wednesday, February 10, 2010 8:35 AM<br>
<b>To:</b> Rotary motors in aircraft<br>
<b>Subject:</b> [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: =
N.A. Renesis to turbo</span></p>
</div>
<p class=3D"MsoNormal">=A0</p>
<p class=3D"MsoNormal" style=3D"margin-bottom: 12pt;">Sun 100 flown at 500 =
ft. <br>
Top speed on a normally aspirated aircraft is always best at sealevel.=A0=
=A0 Best fuel economy is reached up high.<br>
<br>
Tracy</p>
<div>
<p class=3D"MsoNormal">On Tue, Feb 9, 2010 at 10:45 PM, Mike Wills &lt;<a h=
ref=3D"mailto:rv-4mike@cox.net" target=3D"_blank">rv-4mike@cox.net</a>&gt; =
wrote:</p>
<div name=3D"Compose message area">
<div>
<p class=3D"MsoNormal"><span>When you guys put out these numbers (RPM, spee=
d, etc...) would also be helpful to know at what altitude. I assume at or c=
lose to sea level? I havent yet made any speed runs at low altitude.</span>=
</p>

</div>
<div>
<p class=3D"MsoNormal">=A0</p>
</div>
<div>
<p class=3D"MsoNormal"><span>Mike</span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size: 10pt;">=A0</span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"background: whitesmoke none repeat scroll 0=
% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-b=
ackground-inline-policy: continuous;"><b><span style=3D"font-size: 10pt;">F=
rom:</span></b><span style=3D"font-size: 10pt;">
<a href=3D"mailto:tracy@rotaryaviation.com" title=3D"tracy@rotaryaviation.c=
om" target=3D"_blank">
Tracy Crook</a> </span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background: whitesmoke none repeat scroll 0=
% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-b=
ackground-inline-policy: continuous;"><b><span style=3D"font-size: 10pt;">S=
ent:</span></b><span style=3D"font-size: 10pt;"> Tuesday, February 09, 2010=
 5:27 PM</span></p>

</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"background: whitesmoke none repeat scroll 0=
% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-b=
ackground-inline-policy: continuous;"><b><span style=3D"font-size: 10pt;">T=
o:</span></b><span style=3D"font-size: 10pt;">
<a href=3D"mailto:flyrotary@lancaironline.net" title=3D"flyrotary@lancairon=
line.net" target=3D"_blank">
Rotary motors in aircraft</a> </span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"background: whitesmoke none repeat scroll 0=
% 0%; -moz-background-clip: border; -moz-background-origin: padding; -moz-b=
ackground-inline-policy: continuous;"><b><span style=3D"font-size: 10pt;">S=
ubject:</span></b><span style=3D"font-size: 10pt;"> [FlyRotary] Re: rpm vs =
Power was : Throttle limits
 was Re: N.A. Renesis to turbo</span></p>
</div>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal">=A0</p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"color: black;">Tracy, if you have the=
 data could you give us the=A0 RPMs you saw at the 205 and 217.5 air speeds=
?<br>
<br>
Dennis H. <br>
Renesis RV-7A<br>
Austin, Tx.<br>
</span><br>
That was 209 and 217.5=A0=A0=A0 <br>
<br>
the 209 mph speed was with the 2.176 drive turning a 68 - 71 prop with engi=
ne turning 6300 , mixture leaned to 17 gph.=A0 On other occasions I could p=
ush it to 6400 at best power mixture burning 20 gph.<br>
<br>
The 217.5 mph was with a 2.85 drive turning a 74 - 88 prop with engine turn=
ing 7250.=A0 I didn&#39;t get a good read on the fuel flow but obviously it=
 would have been higher.=A0 I remember requesting priority landing after th=
e race due to low fuel.=A0=A0
<br>
<br>
Neither run was done at best power mixture but leaned a few gph less than m=
ax.<br>
<br>
Tracy</p>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal">=A0</p>
</div>
<br>
<font size=3D"1" color=3D"Black" face=3D"Arial">This message, and the docum=
ents attached hereto, is intended only for the addressee and may contain pr=
ivileged or confidential information. Any unauthorized disclosure is strict=
ly prohibited. If you have received this
 message in error, please notify us immediately so that we may correct our =
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</font>
</div>

</blockquote></div><br>

--00c09f99e122d3f8df047f453151--