> Regarding the prop, this is the prop that Ron
Gowan had on his rotary
> powered LongEZ. It is designed for 160
hp (rather than 120hp). It is
> similar to what the 0320 LongEZ guys
are using. Ron Gowan got 195 mph in
> his rotary powered LongEZ
with this prop at 6000 rpm's. I was initially
> unable to get
above 5100 rpm's (until I removed the cowling and found the
> REAL
power problem). Now that I am getting 5600 rpm's static, it is very
>
likely that I would be able to get that elusive 6000 rpms once the prop
> unloads, and my engine is getting cold ram air instead of heated
cowling
> air. Paul Conner
>
> ----- Original
Message -----
> From: "Jim Sower" <
canarder@frontiernet.net>
>
To: "Rotary motors in aircraft" <
flyrotary@lancaironline.net>
>
Sent: Thursday, February 17, 2005 1:39 PM
> Subject: [FlyRotary] Re: I
found the power
>
>
> > Paul,
> > I'm
inquiring into the adequacy of the NACA duct(s) you want to use to
>
> feed your throttle body. If I wasn't really confident that they
would
> > perform as advertised (it's hard to make them work really
well in the low
> > pressure areas of the fuselage) I'd be inclined
to use a P-51 type
> > external scoop like you see under right wing
of Velocitys or something
> > like that.
> >
> >
As to the prop, I would not use a prop designed for a 120 HP engine to
> > make power estimates on a rotary. I would not fly the
airplane until I
> > was getting at least 5000 rpm on a prop
comparable to the one ED used when
> > he was running his 2.17
PSRU. Someone with a Lyc O-360 should be able to
> > lend you
a prop to test with for a while if your prop is a little radical.
>
>
> > 5200 rpm on a 62 x 66 prop is not useful for power
determination. If you
> > look at prop rpm (2390) it tells you
that you have about the same power as
> > an O-235 - about 110 - 115
hp. Somehow you've got to extract a lot more
> > power out of
that machine. Maybe check out your fuel flow on your high
> >
power turn ups and ponder that for a while.
> >
> > I would
not fly that airplane until I was getting good rpm with a REAL
> >
prop ... Jim S.
> >
> > Paul wrote:
> >
>
>> Hi, Jim....I still had the smaller 62 x 66 prop on at the time.
Regarding
> >> the size of the NACA duct, are you referring to
the large one on the
> >> bottom of the fuselage, or the proposed
two smaller ones for bringing in
> >> air to my
throttlebody? Take care. Paul Conner
> >>
>
>> ----- Original Message ----- From: "Jim Sower" <
canarder@frontiernet.net>
>
>> To: "Rotary motors in aircraft" <
flyrotary@lancaironline.net>
>
>> Sent: Wednesday, February 16, 2005 11:30 PM
> >> Subject:
[FlyRotary] Re: I found the power
> >>
> >>
>
>>> Paul,
> >>> What size prop is this that gives you
5600 rpm now? Is it still the one
> >>> off of the O-235
or have you gone back to your original? What's the
> >>>
total area of the NACA duct (like top view)?
> >>> Just
wonderin' ... Jim S.
> >>>
> >>> Paul
wrote:
> >>>
> >>>> Today I finished
installing the firesleeve on the remaing fuel lines,
> >>>>
made some stand-offs so that the fuel lines would not be right up
>
>>>> against the engine, and finished hooking up and securing a
few other
> >>>> items. With the top cowling off, I
ran the pumps for a minute, then
> >>>> checked for
leaks...none found. Then I started the engine and ran it
>
>>>> for 20 or so seconds and shut it down and reinspected for
fuel leaks.
> >>>> None found. I restarted and
taxiied away from the hangar a bit so as
> >>>> to not be
as loud for others in and near the hangar and did a full
>
>>>> power runup. I hit 5600 static rpm's. In the past, the
best I could
> >>>> hope for was 5200, most of the time
settling for 5100 rpm's. I taxiied
> >>>> back in and
installed the top cowling....max rpm's 5100. Took the top
>
>>>> cowling back off....max rpm's 5600. One more
try....5100 with the
> >>>> cowling back on. It is
beginning to become more clear to me, that one
> >>>> of
two things are affecting rpm's. Option one is that with the top
>
>>>> cowling on the engine is ingesting heated air and just cannot
develop
> >>>> the same power as when it ingests outside
unheated air. Option two is
> >>>> the muffler
bearing may be worn. I'm kinda leaning toward option one.
>
>>>> I was thinking of installing
two small NACA ducts on the bottom of
> >>>> my cowling
with two hoses coming up to feed air to my TWM throttlebody.
>
>>>> The NACA ducts I purchased from Van's RV (made for cowling
ventilation)
> >>>> already have a male outlet already
molded in the assembly, so you just
> >>>> slide a hose
over it and secure with a clamp. Very simple
> >>>>
installation.(Works well for my cabin ventillation) If I recall
>
>>>> correctly, they are about the same size as my throttle body
bore. I
> >>>> wonder if I will loose much efficiency as
the air goes through the
> >>>> corregated hose, and if the
Van's RV ventillation NACA ducts will
> >>>> provide a
sufficient volume of air. Of course while flying, I would
>
>>>> have the advantage of a little bit of ram effect as well as
the ability
> >>>> to suck in fresh outside air that has
not been heated inside the
> >>>> cowling during
taxi/takeoff run. Any opinions/suggestions would of
>
>>>> course be much appreciated. I will discuss the vapor
lock issue in the
> >>>> next post, so as to not complicate
responses, etc. Thanks to all who
> >>>> reply.
Paul Conner
> >>>>
> >>>>
------------------------------------------------------------------------
>
>>>>
> >>>>
> >>>> No virus
found in this outgoing message.
> >>>> Checked by AVG
Anti-Virus.
> >>>> Version: 7.0.300 / Virus Database:
265.8.8 - Release Date: 2/14/2005
> >>>>
>
>>>>
------------------------------------------------------------------------
>
>>>>
> >>>>
> >>>>
>
>>>>>> Homepage:
http://www.flyrotary.com/>
>>>>>> Archive:
http://lancaironline.net/lists/flyrotary/List.html>
>>>>>>
> >>>
>
>>>>> Homepage:
http://www.flyrotary.com/>
>>>>> Archive:
http://lancaironline.net/lists/flyrotary/List.html>
>>>>
> >>>
> >>>
>
>>> --
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message.
> >>> Checked by AVG Anti-Virus.
> >>>
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>
>>>
> >>>
> >>
> >>
>
>>
> >>
> >
> >>>
Homepage:
http://www.flyrotary.com/>
>>> Archive:
http://lancaironline.net/lists/flyrotary/List.html>
>
> >
> > --
> > No virus found in this
incoming message.
> > Checked by AVG Anti-Virus.
> >
Version: 7.0.300 / Virus Database: 265.8.8 - Release Date: 2/14/2005
>
>
> >
>
>
>
>
> --
> No
virus found in this outgoing message.
> Checked by AVG
Anti-Virus.
> Version: 7.0.300 / Virus Database: 265.8.8 - Release Date:
2/14/2005
>
>
> >> Homepage:
http://www.flyrotary.com/>
>> Archive:
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