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Date: Wed, 29 Jun 2005 09:54:31 -0500
Subject: Re: [FlyRotary] Re: P Ports working on dyno
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From: Jerry Hey <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
In-Reply-To: <list-1025875@logan.com>
Message-Id: <B31DA6CC-E8AD-11D9-8E65-0003931B0C7A@earthlink.net>


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On Wednesday, June 29, 2005, at 09:23 AM, Russell Duffy wrote:

> I don't understand why you think the velocity is guaranteed to be=20
> higher in the PP runner?=A0 That all depends on the size of the =
runners,=20
> and ports.=A0 You can't just make a blanket statement like that.=A0

Not being an engineer I am used to my own stupid mistakes.  The=20
reasoning behind the statement come mainly from two considerations: =20
first the p ports breath a lot better than any side port configuration=20=

thus more air is flowing through them;  secondly, there are only two=20
runners instead of four so naturally the speed will have to be double=20
assuming the same size runners.  If in the case of side port, the=20
intake runner i.d.s are reduced, the skin friction will be greatly=20
increased.  Face it, side ports are a drag.  There is no way =20
velocities in a four runner intake  can ever approach those of a two=20
runner p port.  IMHO,  Jerry

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On Wednesday, June 29, 2005, at 09:23 AM, Russell Duffy wrote:


=
<excerpt><fontfamily><param>Arial</param><color><param>FFFF,0000,0000</par=
am>I
don't understand why you think the velocity is guaranteed to be higher
in the PP runner?=A0 That all depends on the size of the runners, and
ports.=A0 You can't just make a blanket statement like =
that.=A0</color></fontfamily>

</excerpt>

Not being an engineer I am used to my own stupid mistakes.  The
reasoning behind the statement come mainly from two considerations:=20
first the p ports breath a lot better than any side port configuration
thus more air is flowing through them;  secondly, there are only two
runners instead of four so naturally the speed will have to be double
assuming the same size runners.  If in the case of side port, the
intake runner i.d.s are reduced, the skin friction will be greatly
increased.  Face it, side ports are a drag.  There is no way=20
velocities in a four runner intake  can ever approach those of a two
runner p port.  IMHO,  Jerry


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