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Date: Thu, 6 Jan 2005 13:53:45 -0500
Subject: Re: [FlyRotary] Re: P-Port stuff-  was Re: RV-3 engine rebuild 
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From: Jerry Hey <j-winddesigns@thegrid.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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--Apple-Mail-4-28890512
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On Thursday, January 6, 2005, at 01:28  PM, Russell Duffy wrote:

> My p ports open at 78=BA BTDC and close at 75=BA ABDC. This drawing =
shows=20
> how much later the ports open in comparison with the Leman P Port and=20=

> how they close at nearly the same time. According to calculations made=20=

> by Rolf Peiffer who helped me a lot, my little port has sufficient=20
> capacity up to 8000 rpm. After that you would want to go bigger. The=20=

> exhaust port was left stock with the splitters in. . Jerry=A0
> =A0
> Thanks for the=A0info, and pic Jerry.=A0 Do you have an estimate of =
how=20
> much HP you expect to make at 7500 rpm?=A0 And can you get that thing=20=

> running in the next month, so=A0it will be easier for me=A0to =
decide=A0what=20
> to do=A0:-)
> =A0
> Cheers,
> Rusty

Rusty, The hp question????  A worse case scenario I feel would be  230=20=

hp at 7500.  I think around 250 hp is realistic if we can get it up to=20=

its potential.   It depends on so many factors that will have to be=20
ironed out on the dyno.   I have a 2:17 drive and a 800 lb airplane so=20=

if I equal PowerSport's performance of 215 at 6000 that would be=20
sufficient to  get the heart pumping on climb out.     That said,  I=20
think PowerSport's intake is too long and also they could benefit from=20=

ram air.  So maybe I will do a little better then they have.  My=20
exhaust is a free flowing, zero back pressure  design   and I am hoping=20=

  it will help too.  Best thing for  you to do is to haul that engine to=20=

Lynn"s and knock out a p port in a couple of days.   Jerry
> =A0

--Apple-Mail-4-28890512
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On Thursday, January 6, 2005, at 01:28  PM, Russell Duffy wrote:


<excerpt>My p ports open at 78=BA BTDC and close at 75=BA ABDC. This
drawing shows how much later the ports open in comparison with the
Leman P Port and how they close at nearly the same time. According to
calculations made by Rolf Peiffer who helped me a lot, my little port
has sufficient capacity up to 8000 rpm. After that you would want to
go bigger. The exhaust port was left stock with the splitters in. .
=
Jerry<fontfamily><param>Arial</param><color><param>FFFF,0000,0000</param>=A0=
</color></fontfamily>

=A0

=
<fontfamily><param>Arial</param><color><param>FFFF,0000,0000</param>Thanks=

for the=A0info, and pic Jerry.=A0 Do you have an estimate of how much HP
you expect to make at 7500 rpm?=A0 And can you get that thing running in
the next month, so=A0it will be easier for me=A0to decide=A0what to =
do=A0:-)</color></fontfamily>

=A0

=
<fontfamily><param>Arial</param><color><param>FFFF,0000,0000</param>Cheers=
,</color></fontfamily>

=
<fontfamily><param>Arial</param><color><param>FFFF,0000,0000</param>Rusty<=
/color></fontfamily>

</excerpt>

Rusty, The hp question????  A worse case scenario I feel would be  230
hp at 7500.  I think around 250 hp is realistic if we can get it up to
its potential.   It depends on so many factors that will have to be
ironed out on the dyno.   I have a 2:17 drive and a 800 lb airplane so
if I equal PowerSport's performance of 215 at 6000 that would be
sufficient to  get the heart pumping on climb out.     That said,  I
think PowerSport's intake is too long and also they could benefit from
ram air.  So maybe I will do a little better then they have.  My
exhaust is a free flowing, zero back pressure  design   and I am
hoping  it will help too.  Best thing for  you to do is to haul that
engine to Lynn"s and knock out a p port in a couple of days.   Jerry

<excerpt>=A0

</excerpt>=

--Apple-Mail-4-28890512--