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tc1917(at)bellsouth.net
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 Posted: Wed Apr 29, 2009 1:52 am Post subject: noise |
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Just for the record, many, many people hear this noise, not just me in the
cabin. It starts on the ground at about 2500 rpm and really makes itself
known by the time you get to 4000. On the ground, in the air, everywhere,
its there. By the time you get to around 4800 or more in the air, you
cannot stand it without the ANR set. Sounds like five o'clock charlie in
the MASH series. Everyone knows it is me from over five miles away. Great
Kolb Airship, fun to fly, will do anything, zoom zoom but -- the nastiest
sound around. end. ted cowan, alabama, slingshot, 912 ul
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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 29, 2009 6:08 am Post subject: noise |
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| Quote: | Just for the record, many, many people hear this noise, not just me in the
cabin.
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ted cowan, alabama, slingshot, 912 ul
Ted had his SS at last year's Kolb Homecoming.
When he flew, the noise was loud and easily heard even by a deaf guy.
Sounded just like the noise Ronny Collin's SS was making when powered by a
582 and a 3 blade fast taper Warp Drive Prop. When I flew Ronny's SS the
noise and vibration were very evident. Didn't make much difference what I
did, the noise and vibration remained. It was reduced only when throttle
was retarded.
After I landed I suggested Ronny fly the SS and let me fly his wing to see
if I could see anything abnormal about his SS. We did and I did discover
the fabric on the top inboard rear of the right wing ballooning. Builder
had rib stitched rather than use fabric rivets. The rib stitching was
pulling loose.
Ronny used fabric rivets to repair the right wing and also riveted the left
wing in the same area.
Test flight resulted in harmonic noise and vibration had disappeared, never
to return. This SS was also at the Kolb Homecoming 2008.
Unlike Ted, Ronny had good quality blades.
john h
mkIII
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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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