jindoguy(at)gmail.com
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 Posted: Fri Oct 05, 2007 9:22 am Post subject: Wooden prop bolt torque |
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Rick Nielsen brought up an interesting point about bolt torque on wooden props, that is shrinking of the wood with temperature and humidity. One of the fellows on the canard aviators forum lost a prop due to this factor and lost a large chunk of wing in the process. Marc has since been experimenting with belleville washers as a way to ameliorate the effects of temperature and humidity. You'd have to take into account that props typically used on Kolbs have about half the hub thickness of those used on a Lycoming O-360, but belleville washers (spring washers) are available from McMaster Carr (pg 1165) in a variety of rates and thicknesses, and can be stacked to get almost any combination of pressure required to maintain a consistent torque pressure on the prop hub.
Ok, it's experimental aviation here's an experiment to perform. I'll take it up when I get my Firestar certificated next month, but if there's anyone out there who's looking for a project, feel free to start without me.
Rick
--
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport. [quote][b]
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