Walter,
I agree, I think I use that 72" WD prop like a helicopter uses the main
rotor.
If my memory serves me correct, I am only turning the prop at 1600-1700 rpm.
Now the CofG might be the reason for the lack of sink rate. When I matched the
EA-81 up to the firewall, I built the mount so the engine was a far back as I
could put it but still allow me to service the oil filter and belt. I then had
a 4 inch extension added to the gearbox so the prop would be where the 912
cowl needed it to be. I think I just lucked out.
My CofG with just me and 15 gals of fuel (which is like 5 hrs of flying) is
12.66. Add a passenger and it's 13.02
I always felt that I was a little nose heavy because I can't get the tail
wheel to touch first on landing if I tried. Even with full elevator which I
adjusted to give me more than the recommended up travel, the tail is about 4
inches of the ground at touch down.
Frank
On 5/3/2003 2:29 PM,
WALTER.KLATT@SHAW.CA wrote to MURPHY-REBEL:
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-> 02 May 2003 18:23:34 -0600 (MDT)
-> Date: Fri, 02 May 2003 17:24:19 -0700
-> From: Walter Klatt <
walter.klatt@shaw.ca>
-> Subject: RE: Subaru powered cruise speeds
-> In-reply-to: <
1051898820@dcsol.com>
-> To:
murphy-rebel@dcsol.com
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PFEOJDIIGOHLFACHDMDNMEEACHAA.Walter.Klatt@shaw.ca>
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->
-> Hi, Frank. Very interesting to hear about your great
-> performance out of that EA81. I would bet that 72" WD
-> has a lot to do with that. <g>
->
-> I do have a question about your c of g, though. I have
-> one of those Rebels with the high sink rate at 60 mph.
-> My c of g is at 9.7 which is a little nose heavy and am
-> wondering if that is doing it. Mine is also a little
-> heavy right now with the 0320 and amphibs, but I
-> remember that even back on wheels, it still had that
-> high sink rate at 60 with power off. So would be
-> interested in hearing your what c of g is.
->
-> Walter
->
-> > -----Original Message-----
-> > From:
mike.davis@dcsol.com
-> > [mailto:
mike.davis@dcsol.com]On Behalf Of
-> >
paco@dcsol.com
-> > Sent: Friday, May 02, 2003 11:07 AM
-> > To:
murphy-rebel@dcsol.com
-> > Subject: Re: Subaru powered cruise speeds
-> >
-> >
-> > I have actually had people look at my
-> > plane/engine combo and tell me it would
-> > never work let alone be a decent performer.
-> > One fellow stopped in to look at
-> > it this winter and he told my hanger partner
-> > not to let me try to fly my Rebel
-> > with this engine. He said I would never make
-> > it off the ground. My buddy told
-> > him that I had 80+ flights on it this way at
-> > which time this person figured we
-> > were all full of it.
-> >
-> > I'm not sure why there is such a wide range
-> > of cruise speeds for Rebels of
-> > similar build? I can even tell you that both
-> > my wings are built by two
-> > different people and one needs quite a large
-> > trim tab on it just to keep the
-> > wings level. (you might spot this in the
-> > pictures) This in addition to the
-> > slight up elevator possition during cruise
-> > must eat away at even more
-> > airspeed? I have heard of a couple O-320's
-> > and a few O-235's that cruise at
-> > 80mph? I don't understand? The other thing
-> > my Rebel seems to do that no one
-> > else's does is glide!!! I have to fly my
-> > circuits so low just to keep the
-> > speed under the 80mph flap limit. The
-> > slightest push on the stick and I'm at
-> > 95+ in the blink of an eye. I don't seem to
-> > have the severe sink rate that
-> > people have talked about. I can throttle
-> > back to 3000rpm @ 60mph and fly
-> > comfortably for an hour (I've done it many
-> > times) If I keep pulling on the
-> > stick it just points to the sky and slows
-> > down to what seems to be not moving
-> > at all! The angle on the airspeed pitot is
-> > so great that the needle shows 0.
-> >
-> > Same thing when I asked the group about
-> > wheel pants. Some reported 3-5 mph
-> > gains while others reported 7mph losses. I
-> > have come to believe that every
-> > Rebel might have its own unique flying
-> > characteristics especially when it
-> > comes to cruise speeds.
-> >
-> > Maybe FWF weight is very critical in the
-> > Rebel, and maybe I was lucky enough
-> > to get it right on.
-> >
-> > Anyway, sorry about blabbing on. I use a
-> > 72", 3-Blade Warp, straight blades
-> > set at 18.5 degrees. Now this is another
-> > issue that I have been involved with
-> > on the Sub list. Some people don't seem to
-> > be able to turn their props
-> > (exactly the same as mine) with the turbo
-> > EA-81. Maybe my carb'd EA-81 is
-> > putting out more than 90hp?, I don't know?
-> >
-> > Regular spring gear, no pants.
-> >
-> > Anyway If there are any dis-believers I will
-> > have to post some MPEGS on my
-> > site this spring or you will have to fly to
-> > Sarnia some day.
-> >
-> > Frank
-> >
-> > -> Hi Frank,
-> > -> Those numbers look good indeed for an
-> > EA-81. Could I ask what prop you're
-> > -> using? Do you have the spring gear or
-> > bungee? Do you have wheel pants?
-> > -> Thanks much!
-> > -> Joel Jacobs
-> > ->
-> > -> ----- Original Message -----
-> > -> From: <
paco@dcsol.com>
-> > -> To: <
murphy-rebel@dcsol.com>
-> > -> Sent: Friday, May 02, 2003 9:45 AM
-> > -> Subject: Re: Subaru powered cruise speeds
-> > ->
-> > ->
-> > -> > I had to speak up.
-> > -> > I'm surprised you are not getting
-> > higher cruise speeds with the 2.2.
-> > -> > I know we are talking about the 2.2
-> > here, but for just for comparison
-> > -> sake,
-> > -> > I if run the EA-81 at 3700 rpm through
-> > a 2.2:1 reduction I am cruising at
-> > -> > around 85-90mph. I am a bit lighter at
-> > around 850-900# empty weight but
-> > -> the EA-
-> > -> > 81 is probably only producing 60-70hp
-> > at this rpm and running
-> > -> effortlessly.
-> > -> > The other day it was smooth air and I
-> > was able to test higher power
-> > -> settings.
-> > -> > At 4400 engine rpm I was flying at a
-> > true 112mph. (GPS verified both
-> > -> > directions)I am now going to add some
-> > temporary fairings with some high
-> > -> speed
-> > -> > duct tape to see if adding fairings
-> > will gain me some more mph's.
-> > -> >
-> > -> > More importantly, if you have made or
-> > are flying with homemade exhaust
-> > -> pipes,
-> > -> > make sure they do not allow any fumes
-> > into the cabin. I had a quick lesson
-> > -> on
-> > -> > CO poisoning at 4500 ft the other day.
-> > To be honest with you, it scared
-> > -> the
-> > -> > crap out me. I now put a swiss muffler
-> > on that exists behind the rear
-> > -> wheel
-> > -> > strut.
-> > -> >
-> > -> > Frank
-> > -> >
-> > -> > -> >
-> > -> > -> Ken,
-> > -> > -> The Subaru is slow... 95MPH. It is
-> > also heavy. 1030# empty weight.
-> > -> > ->
-> > -> > ->
-> > _____________________________________________
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-> > -> >
-> > -> >
-> > -> >
-> > -> >
-> > ->
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