Paul wrote:
Hi, fellow rotary enthusiasts....today I took my 13b powered SQ2000
canard up for it's second test flight. Today's flight was much more
relaxing, as I already knew (from flight one) that the
aircraft would fly. I took her up to 2500 feet and just flew around
for a while, watching water and oil temperatures, tried a few steep
turns and did a little sightseeing (All within gliding
distance of the airport). It was 64 degrees F today when I took off.
During climb, my water temp climbed to 185 and oil climbed to 182.
Once I leveled off, temps settled in at 167 for the water and
164 for the oil.
With the new intake manifold, I was able to go to WOT on takeoff
roll
and left it there until reaching 2500 feet, where I leveled off for
cruise. I'm beginning to be more
convinced that I may be over propped. (64 x 78 3-blade Performance
prop). I could only get 4800 to 5000 rpm's both in climb and in
cruise.
I throttled back to 4400 and the cruise speed was rather
disappointing at 140 knots with the gear still down.
I nosed her over slightly and IAS quickly went up to 180 knots, and
flight controls felt positive with no slop in the controls. Engine
ran
smoothly and after shutdown, no oil or water leaks were found. It
was
nice to just hop in, fire it up and have a simple, turn-the key and
go
fly experience for my second flight. I need to get up to
altitude next and do some stall testing soon, but would rather
concentrate on getting the rpm's higher.
Even Tracy and Finn got higher RPM's with carburetors, so I highly
suspect the prop. The
rpm's max out at just beyond 1/2 throttle setting, and advancing the
throttle further yields no increase in rpm's. The engine still runs
smoothly, both at the 1/2 throttle and WOT positions....just
maxes out the rpm's at 4800 to 5000.
My idle is set too low (900 engine rpm's) and after landing, I
found that the engine had quit. I rolled off the active and
attempted a
restart....nothing. Engine would turn over, but would not
fire. I suspected flooding, so I turned off the fuel pump and
advanced the throttle to WOT and within a few blades, it fired right
up, then I turned the fuel pump back on and returned the throttle
to idle and taxied back in.
Hope this was not too boring. Paul Conner, Mobile, AL
I say it is the manifold and not the prop. I would change the manifold
before
I would change the prop. I will design a manifold for you. I am sure
Ed
Klepies will
weld it up for you if you wish. We can make it ground adjustable
with sections of rubber hose and hose clamps. Is your engine a four
port or a six port.
Do you have a mixture monitor (O2 sensor) in the exhaust pipe? EGT
gages?
Manifold pressure gage? All essential for tuning the engine.
Could be something as simple as pressure drops across a filter or hot
air intake. Send me some more pictures of the intake system.
Paul Lamar
Paul, What is the diameter of the butterflies in the TWM throttle body
you
have?
Perhaps Dave Atkins will give you your money back if you complain long
and
loud enough? I don't know what Ed K will charge but I will design it
for
free.
Vance, what do you think of this prop?
Too bad Dave did not send you this TWM intake manifold.
Paul Lamar
Now THAT manifold I like !!! That would fit perfectly in my cowling. Do
you
have any more information about that manifold? Is it made for a rotary?
I
would shell out the bucks for that manifold if it would match up to my
intake ports. It would fit where I need it, not have the after-shutdown
fuel
drips like my wrap-over manifold had. My wrap-over manifold hit the
bottom
of the top cowling, even though Ed made it "hug" the engine, so a
wrap-over
manifold is far less desireable. I prefer not to put draggy "bumps" on
the
top of my cowling. Thanks for the picture. Paul Conner
"No draggy bumps" is kind of ironic given the current performance.
I really think you are more concerned with the esthetics.
Kind of touchy feely but that is OK too :)
Yes, I am also concerned about the esthetics....one of the reasons I chose
this aircraft design. (Sleek looks and low drag profile) Similar to my first
LongEZ, but refined.
It could be made to match but I am not sure that is the best thing.
You will need another TB. You might as well get Ed to build you a custom
manifold. Sorry the first one did not work out but I had nothing
to do with it. I never like those "Y" anyway.
IMHO you will not get a long enough runners going straight out.
However if that is what you want we can do that too.
If you don't like the snorkel you don't have to use it. What the heck
is five knots when it comes to looks :)
On an aircraft as fast as a canard, I could live with a 5 knot penalty if I
can keep the looks. Yep.....5 knots.....I'll just depart 5 minutes earlier
and get there at the same time.
It does not have to be a up and over. Here is one that I feel is sure to
fit. Send me some pictures of your cowl? what size spinner are you
using? What is the overall height and width of the firewall?
distance from prop flange to the firewall.
I will do a cowl like yours and see if it fits the custom manifold.
I will take pictures of the cowl today....I am not using any spinner....I
will measure the firewall today as well and the distance from the prop
flange to the firewall is 39 inches.
What is the diameter of the butterflies in the TWM throttle body you
have? Perhaps we can save it.
I will have to measure the TWM butterflies today as well.
BTW you might be happy with your current manifold once you get rid
of the filter and get a cold air scoop on there.
That would be wonderful, and inexpensive !!! I really like your last
statement. Thanks for your assistance. Paul Conner
Unfortunately since you ran it without the filter already that looks less promising.
Paul Lamar
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