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Date: Sat, 7 Feb 2009 16:33:44 -0800 (PST)
From: Bryan Winberry <bryanwinberry@bellsouth.net>
Reply-To: bryanwinberry@bellsouth.net
Subject: Re: [FlyRotary] Bernulli's Principle
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Lynn,
Thanks for the insomnia pill.=A0=20
=A0
It's funny you should mention lack of sleep.=A0 Last night I woke up at 3am=
 thinking of this damn intake.
=A0
Bryan
borderline sicko

--- On Sat, 2/7/09, Lynn Hanover <lehanover@gmail.com> wrote:

From: Lynn Hanover <lehanover@gmail.com>
Subject: [FlyRotary] Bernulli's Principle
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Date: Saturday, February 7, 2009, 6:32 PM



I invite you to the Bernulli Principle web site.
=A0
http://home.earthlink.net/~mmc1919/venturi.html
=A0
=A0
I did some shapes to play with in the attachment.=20
=A0
Leave the reverse cone at the right end to replicate the port into the cham=
ber. Note a little yellow sign pop on when flow slows too fast and separate=
s.=20
=A0
This would be at the bowl shape where the flow makes the 180 turn into the =
chamber. This area is too big volume wise and costs power. Some racers fill=
 this in slightly to eliminate this problem. The lack of this feature in th=
e periphery port engine makes a huge difference, in that velocity is carrie=
d right into the chamber, rather than slowing.=20
=A0
Although not practical the ideal shape is probably a long tapered runner. S=
o velocity rate of increase is a constant value.=20
=A0
Imagine that the mixture is a sausage, and you want the biggest piece of sa=
usage cut off by each rotor face.=20
The highest possible velocity is important for that. However the high veloc=
ity creates the highest drag over a long distance.=20
=A0
Two 44MM chokes in a Weber is enough for 310 HP at 10,300 RPM from a 12A. T=
he TB size need not be the runner size.=A0My engine with a bridgeport gets =
250 HP at 9,400 RPM from two 38MM chokes.=20
=A0
Short runners for high RPM. Long runners for low RPM.
=A0
Big runners slow velocity and ruin low speed performance with big thin=A0pi=
eces of sausage. Small runners give crisp low speed performance with smalle=
r, longer pieces of sausage.
=A0
Now you won't sleep tonight either.
=A0
Lynn E. Hanover=20
=A0--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.=
html

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<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Lynn,</DIV>
<DIV>Thanks for the insomnia pill.&nbsp; </DIV>
<DIV>&nbsp;</DIV>
<DIV>It's funny you should mention lack of sleep.&nbsp; Last night I woke up at 3am thinking of this damn intake.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Bryan</DIV>
<DIV>borderline sicko<BR><BR>--- On <B>Sat, 2/7/09, Lynn Hanover <I>&lt;lehanover@gmail.com&gt;</I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid">From: Lynn Hanover &lt;lehanover@gmail.com&gt;<BR>Subject: [FlyRotary] Bernulli's Principle<BR>To: "Rotary motors in aircraft" &lt;flyrotary@lancaironline.net&gt;<BR>Date: Saturday, February 7, 2009, 6:32 PM<BR><BR>
<DIV id=yiv409665203>
<DIV>I invite you to the Bernulli Principle web site.<BR>&nbsp;<BR><A href="http://home.earthlink.net/~mmc1919/venturi.html" target=_blank rel=nofollow>http://home.earthlink.net/~mmc1919/venturi.html</A><BR>&nbsp;<BR>&nbsp;<BR>I did some shapes to play with in the attachment. <BR>&nbsp;<BR>Leave the reverse cone at the right end to replicate the port into the chamber. Note a little yellow sign pop on when flow slows too fast and separates. <BR>&nbsp;<BR>This would be at the bowl shape where the flow makes the 180 turn into the chamber. This area is too big volume wise and costs power. Some racers fill this in slightly to eliminate this problem. The lack of this feature in the periphery port engine makes a huge difference, in that velocity is carried right into the chamber, rather than slowing. <BR>&nbsp;<BR>Although not practical the ideal shape is probably a long tapered runner. So velocity rate of increase is a constant value. <BR>&nbsp;<BR>Imagine
 that the mixture is a sausage, and you want the biggest piece of sausage cut off by each rotor face. <BR>The highest possible velocity is important for that. However the high velocity creates the highest drag over a long distance. <BR>&nbsp;<BR>Two 44MM chokes in a Weber is enough for 310 HP at 10,300 RPM from a 12A. The TB size need not be the runner size.&nbsp;My engine with a bridgeport gets 250 HP at 9,400 RPM from two 38MM chokes. </DIV>
<DIV>&nbsp;</DIV>
<DIV>Short runners for high RPM. Long runners for low RPM.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Big runners slow velocity and ruin low speed performance with big thin&nbsp;pieces of sausage. Small runners give crisp low speed performance with smaller, longer pieces of sausage.<BR>&nbsp;<BR>Now you won't sleep tonight either.<BR>&nbsp;<BR>Lynn E. Hanover <BR>&nbsp;</DIV></DIV><PRE>--
Homepage:  http://www.flyrotary.com/
Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html
</PRE></BLOCKQUOTE></td></tr></table>
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