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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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 Posted: Wed Apr 15, 2009 6:05 pm Post subject: Tweaking the Warp Drive |
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Installed new blades on my mkIII, 71" tapered, nickle steel leading edges,
yesterday.
Changing from 70".
Test flight yielded 5400 rpm WOT straight and level flight. I knew it was
going to be a tad over pitched before I took off. Was looking for 5500 to
5600.
Flew great, even though not quite as brisk as I like it.
Today, pulled 1 degree of pitch out of the blades. Used the Warp Drive
Protractor to do that on one blade. Then adjusted the other two blades with
a laser tool provided by Scott (icrash). It worked great to get all three
blades reading off the same sheet of music.
My field elevation is 410 msl. Pulled 5400 rpm climbing out. Engine felt
brisk. Climbed to 5,000 feet msl. At 5,000 feet the 912ULS was turning
5,300 rpm, climbing a steady 1,500 fpm with me (200 lbs) and 15 gals (90
lbs) of fuel, at 45 mph indicated. OAT was 40F at 5,000 feet.
WOT straight and level at 1500 feet yielded 5,600 rpm. I am happy. The
engine and airplane seems much lighter when freed up a bit, rather than
overpropped. Cruise seems to be about the same, 80 to 85 mph, at 5,000 to
5,100 rpm.
Now, when I head out West, I'll have a good responsive combination to haul a
lot heavier airplane at much higher altitudes.
Did not experience any abnormal operation with the new blades, as usual.
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Wed Apr 15, 2009 6:38 pm Post subject: Re: Tweaking the Warp Drive |
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| John Hauck wrote: | Installed new blades on my mkIII, 71" tapered, nickle steel leading edges,
yesterday.
Changing from 70".
Test flight yielded 5400 rpm WOT straight and level flight. I knew it was
going to be a tad over pitched before I took off. Was looking for 5500 to
5600.
Flew great, even though not quite as brisk as I like it.
Today, pulled 1 degree of pitch out of the blades. Used the Warp Drive
Protractor to do that on one blade. Then adjusted the other two blades with
a laser tool provided by Scott (icrash). It worked great to get all three
blades reading off the same sheet of music.
My field elevation is 410 msl. Pulled 5400 rpm climbing out. Engine felt
brisk. Climbed to 5,000 feet msl. At 5,000 feet the 912ULS was turning
5,300 rpm, climbing a steady 1,500 fpm with me (200 lbs) and 15 gals (90
lbs) of fuel, at 45 mph indicated. OAT was 40F at 5,000 feet.
WOT straight and level at 1500 feet yielded 5,600 rpm. I am happy. The
engine and airplane seems much lighter when freed up a bit, rather than
overpropped. Cruise seems to be about the same, 80 to 85 mph, at 5,000 to
5,100 rpm.
Now, when I head out West, I'll have a good responsive combination to haul a
lot heavier airplane at much higher altitudes.
Did not experience any abnormal operation with the new blades, as usual.
john h
mkIII |
Can you get blades from WD in odd lengths? I thought you could only get them in evens....
Even with the mild problems with harmonics on my plane, my WD continues to shock and amaze me with its performance. My 68" still gives me around 1000fpm at my field elevation of 6300' and yet yeilds right at 100mph indicated at only about 5100 rpm slightly above half throttle.
I may have posted this already but I did also discover the other day that the harmonic part of the vibration goes virtually away at cruise, so I may be able to keep the WD on the plane as-is.
Dennis and I if all goes well with weather (and I get my leave from work) will be travelling to MV a bit slower than that tho, as his Mark III is about a 70mph airplane (reminiscent of my FSII). I'll have some kind of prop on the airplane anyway whichever one works out to be the smoothest....
LS
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LS
Titan II SS |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Wed Apr 15, 2009 6:54 pm Post subject: Tweaking the Warp Drive |
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> Can you get blades from WD in odd lengths? I thought you could only get
them in evens....
| Quote: |
Even with the mild problems with harmonics on my plane, my WD continues to
shock and amaze me with its performance. My 68" still gives me around
1000fpm at my field elevation of 6300' and yet yeilds right at 100mph
indicated at only about 5100 rpm slightly above half throttle.
|
All ya gotta do is ask. They'll cut them any length you want, up to 72" (I
think that is their max length with nickle edges).
75% power is right at 5000 to 5100 rpm on a 912. A little more than 1/2
throttle. Throttle lever positions are not good indicators of power the
engine is producing. RPM works better.
I have a slight vibration at 5,000 rpm with these new blades pitched the way
they are now. I like the pitch, so I'll probably cruise at 5,100 or higher.
Every engine has a sweet spot where it is happiest/smoothest. That is where
I like to operate.
If, for some reason you find a vibration, use the throttle to find a better
place.
Even turbine engines have certain speeds that one should not operate because
of bad vibes. Doubt you will find an airplane engine of any type that is
absolutely vibrationless through the rpm range.
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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