thomas(at)scherer.com
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 Posted: Thu May 11, 2006 3:25 pm Post subject: Vibration |
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Last weekend I spent with curing the vibration sensed in my Europa (Trike, classic, 912ul, Airmaster prop). Got myself an automotive vibration analyser off eBay for 400 US$ and had the pleasure of Kim Prout and his father Paul Prout joining in.
The vibration analyser (EVA 2) would display the frequency and amplitude of vibrations present which will NOT tell you where to add weight, but helps in finding the source of vibration (looking at rpm and the frequencies diplayed).
After trueing the classic spinner to a new level (you can't tell it is rotating any more now) I started adding washers to the spinner backplate until the prop-rpm would not show up any more on the display.
The procedure took about 4 hrs and plenty of short engine runs.
The baby now flies as if an electric motor were installed (this tells you how bad vibrations were before) and I expect all equipment to have longer service life now.
The plane is based in Southern California and I would gladly assist others in de-vibrating their planes or - if you want - buy the unit from me.
Happy landings,
<Thomas, N81EU>
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