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From: WRJJRS@aol.com
Message-ID: <45394.7ab64132.38fd4aee@aol.com>
Date: Mon, 19 Apr 2010 01:58:06 EDT
Subject: Re: [FlyRotary] Re: cooling for ground runs
To: flyrotary@lancaironline.net
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In a message dated 4/18/2010 7:50:30 PM Pacific Daylight Time,  
Bktrub@aol.com writes:

What were the original powersport superlight engines? 13B p-port,  with the 
oil pan mounting flanges cut off, aluminum side housings,  mounted with the 
exhaust side down? I'm sure there's more to them than that,  but I think 
that's what they were, basically.
 
II would have liked to see Powersport make just the engines- forget the  
whole package- if the engine is light, powerful, and reliable, then  
homebuilders will do the rest. 
 
 
Just my two cents.
 
Brian Trubee


Brian, 
 So you can get the straight scoop I'll talk about this. The  "Superlite" 
engine used HIGHLY modified standard Mazda rotor housings. Almost  every 
other part was custom. Water inlet location was changed. ALL center and  end 
plates were aluminum with coatings. The engine used p-ports done the way  they 
have always done, using o-ring seals. Once done this way they never had  
leak problems because the o-rings are designed to handle the heat cycle. The  
PSRU was a custom built planetary with a pendrolus damper to move harmonics  
outside the operating range. The previously mentioned Mazda housings were  
reversed and the engine ran backward so the prop would turn the "right" way. 
The  engine was plugs up and dry sump from the begining. An absolutely 
astounding  piece of work. That said they would be too expensive to sell today. 
Please  remember that this was before Powersport was sold to Ratek Machine in 
Wisconsin.  I don't know if they are still producing anything or not. 
 Steve has come to me to work to save some of the ideas and update  them so 
there won't be any intention of using the designs exactly as done  before. 
Our intention is to produce parts to pay for the cost of making them for  
ourselves with the potential of it becoming a full business much later. There 
is  the possibility of making a complete engine, but for now only the parts. 
One  item of interest is a steel side plate for the converted standard 
engine  that weighs only 1 pound more than the aluminum side plates, but can 
still be  nitrided just like the standard sideplate. These will be for p-ported 
engines  only as there won't be any side ports built in. We also want to 
make a similar  lightweight 20B intermediate housing for 3 rotors using a 
standard e-shaft. The  standard one weighs 45 pounds and even those have become 
unobtainium lately. It  must be the rolex 24 hour racers using them up. I 
have a local shop quoting the  parts as we produce models and drawings as we 
want them to be. That is all I can  say for now, I'll keep the group posted 
as we make progress.
Bill Jepson

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<DIV>
<DIV>In a message dated 4/18/2010 7:50:30 PM Pacific Daylight Time,=20
Bktrub@aol.com writes:</DIV>
<BLOCKQUOTE  style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: bl=
ue 2px solid"><FONT    style=3D"BACKGROUND-COLOR: transparent" face=3DAria=
l color=3D#000000 size=3D2>
  <DIV>What were the original powersport superlight engines? 13B&nbsp;p-po=
rt,=20
  with the oil pan&nbsp;mounting flanges cut off, aluminum side housings,=
=20
  mounted with the exhaust side down? I'm sure there's more to them than=
 that,=20
  but I think that's what they were, basically.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>II would have liked to see Powersport make just the engines- forget=
 the=20
  whole package- if the engine is light, powerful, and reliable, then=20
  homebuilders will do the rest. </DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Just my two cents.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Brian Trubee</DIV></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Brian, </DIV>
<DIV>&nbsp;So you can get the straight scoop I'll talk about this. The=20
"Superlite" engine used HIGHLY modified standard Mazda rotor housings. Alm=
ost=20
every other part was custom. Water inlet location was changed. ALL center=
 and=20
end plates were aluminum with coatings. The engine used p-ports done the=
 way=20
they have always done, using o-ring seals. Once done this way they never=
 had=20
leak problems because the o-rings are designed to handle the heat cycle.=
 The=20
PSRU was a custom built planetary with a pendrolus damper to move harmonic=
s=20
outside the operating range. The previously mentioned Mazda housings were=
=20
reversed and the engine ran backward so the prop would turn the "right" wa=
y. The=20
engine was plugs up and dry sump from the begining. An absolutely astoundi=
ng=20
piece of work. That said they would be too expensive to sell today. Please=
=20
remember that this was before Powersport was sold to Ratek Machine in Wisc=
onsin.=20
I don't know if they are still producing anything or not. </DIV>
<DIV>&nbsp;Steve has come to me to work to save some of the ideas and upda=
te=20
them so there won't be any intention of using the designs exactly as done=
=20
before. Our intention is to produce parts to pay for the cost of making th=
em for=20
ourselves with the potential of it becoming a full business much later. Th=
ere is=20
the possibility of making a complete engine, but for now only the parts.=
 One=20
item of interest is&nbsp;a steel side plate for the converted standard eng=
ine=20
that weighs only 1 pound more than the aluminum side plates, but can still=
 be=20
nitrided just like the standard sideplate. These will be for p-ported engi=
nes=20
only as there won't be any side ports built in. We also want to make a sim=
ilar=20
lightweight 20B intermediate housing for 3 rotors using a standard e-shaft=
. The=20
standard one weighs 45 pounds and even those have become unobtainium latel=
y. It=20
must be the rolex 24 hour racers using them up. I have a local shop quotin=
g the=20
parts as we produce models and drawings as we want them to be. That is all=
 I can=20
say for now, I'll keep the group posted as we make progress.</DIV>
<DIV>Bill Jepson</DIV></FONT></BODY></HTML>

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