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I have two more questions I'd like to get advice on.
1) The propeller is held on by being bolted to a NASCAR wheel hub. The prop shaft passes through the hub shaft and engages the planet gear housing. So basically, all of the force pulling the aircraft along will pass through a single Timken taper bearing held on with a large nut. The number I got off the bearing is 18690. I know these bearings are extremely robust in absorbing the lateral forces of car wheel, but how will they hold up to the 800lbs or so of longitudinal forces from a propeller trying to pull the hub off its shaft?
2) Oil will be fed from the top into a gallery that runs front to back. Oil will feed into the back of the hub, travel through both front and back bearings, and return down the side of the prop shaft. Everything is sealed just fine, except for the front of the hub. Any ideas on how to accomplish this? The prop shaft is 1.250" at the point where it needs to be sealed. The only thing I've come up with so far is to machine a plate to go between the hub and the prop with a recess that will hold a seal.
PSRUTimkenBearing.jpg
PSRUPropShaft.jpg
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