> 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>
>>>>
> >>>
> >>>
> >>>
--
> >>> 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
> >>>
>
>>>
> >>
> >>
> >>
>
>>
> >
> >>> 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:
http://lancaironline.net/lists/flyrotary/List.html