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slyck(at)frontiernet.net
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 Posted: Tue Sep 18, 2007 4:32 am Post subject: bad vibes |
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Kolbers, the vibration I previously reported, more like a buzz
sensation, when running at or about 5000 rpm
has revealed itself to be a harmonic involving the engine/prop/
redrive combination.
Not sure of the actual cause of the resonance but it hammers the prop
shaft bearings,
causing the stack to lose its preload. Preflight two nights ago
revealed a somewhat
unairworthy condition.
As long as I stay away from that rpm I have no problem , but because
of the gain in performance
I have in going over 48-4900 I find that unacceptable.
I'm installing all new shaft bearings and will try another prop, a
two blade configuration
70" warp to see if there is any difference.
BB
do not archive
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Tue Sep 18, 2007 4:48 am Post subject: bad vibes |
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> Kolbers, the vibration I previously reported, more like a buzz
| Quote: | sensation, when running at or about 5000 rpm
has revealed itself to be a harmonic involving the engine/prop/ redrive
combination.
> BB
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Morning Bob:
Sorry to hear about the harmonic problem. However, what little I am
familiar with the Suzuki/Geo Metro engines on light planes, seems to
indicate most have harmonic vibration and torsional vibration problems. I
don't know what the answer is, but hope you get it worked out.
john h
mkIII
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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MKIIIX040
Joined: 31 Mar 2006
Posts: 123
Location: Millinocket, Maine
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| Posted: Tue Sep 18, 2007 5:19 am Post subject: bad vibes |
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All
I also have an annoying, not sure how serious vibe when throttling back from
full power around 4200 RPM. It smooths right out below 4000. Doesn't do it
powering up.
912UL 70" warp, little to much pitch.
What should I look for?
By the way I,ve seen Ellery fly up close and real personal.
I'm convinced he could fly a washing machine with a window fan for power!
Vic
Maine
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MKIIIX040
912UL |
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ElleryWeld(at)aol.com
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| Posted: Tue Sep 18, 2007 6:24 am Post subject: bad vibes |
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Vic it will be interesting what the list comes up with for an answer on that Vibration but it shure would be nice to remove it so any replys to vics Vibration would be nice
and another Question Concerning the Mk3 Xtra does anyone elses Mk3 Xtra take off like a side winder Pulling to the left ?
Ellery in Maine
do not archive
**************************************< [quote][b]
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KolbFlyerJim(at)aol.com
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| Posted: Tue Sep 18, 2007 3:14 pm Post subject: bad vibes |
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Hi BB
Jim here
May I ask what ratio you have in the gear box?
Jim
See what's new at AOL.com and .
[quote][b]
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slyck(at)frontiernet.net
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| Posted: Wed Sep 19, 2007 4:46 am Post subject: bad vibes |
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Jim, no gears but the belt reduction is 2.26:1 -very close to the
rotax 2.27 gearbox for the 80hp 912.
Yesterday, after spending a morning of bulldozing a new meadow then
seeing Thom Riddle off with his trailerload of Kolb FS,
I punched out the old bearing races (cones are the proper
terminology) in the hub and went bowling.
Today I'll start fitting the new assembly, most likely having to
machine a new spacer. Tricky process getting next to no
endplay with dry bearings, all squoze down with 60 ftlbs, double
nutted and keyed with a tab washer.
To be truthful I have never done either a balance check or runout on
the Powerfin 3 blade prop, figuring that
it is so light, it wouldn't be a problem. As the Fonz said, I could
be wr- wr- mistaken.
I'll check both it and the Warp I'll be assembling this week.
re, John Hauck and the suzuki vibes: definitely not a smooth runner
and should have a flywheel ignition sensor
to help smooth things out. My stock distributor Hall type trigger
has a tendency to fire a little unevenly.
Whenever anyone has asked my advice I have suggested going to the 4
cylinder (G13) version
and using the Russian made SPG-2 gearbox instead of the belt drive.
Do as I say, not as I do.
BB
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