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Sonex 815 Build Logs
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Date: 3-14-2008
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Number of Hours: 1.50
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Manual Reference:
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Brief Description: Prop installation
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Took about 45 minutes to bore out the prop torque spools. For the 3300 it uses .375 bolts and the prop spools are supplied at 1/4". Though they are SST, it was not that big a deal to bring them up using the unibit for most of it, then run through with a 3/8" drill. Spent the rest of the time installing the prop on the engine, then put the LH cowling on over that. With the LH cowl in place, marked the breather tube for the bottom bend, made the bend, and tried the RH cowl on with the breather tube in place. I could not get either cowl over the exhaust pipes. These hang down too far anyway, so I'll trim them to be closer fit. Found that with both cowl halfs in place, the oil cooler baffle hangs down too low, preventing the bottom center hinge pin from going in. I'll trim the bottom of the oil cooler (it's just the forwards flange which is not doing anything to hang the cooler). What I'm calling the torque spools go through the large holes in the prop flange on the crank and have a smaller hole down the center for the prop bolt. The larger diameter spool piece protrudes about 1/2" or so into the aft face of the prop. They don't transfer the torque load, but are back-up in case a bolt does loosen - the idea is for them to transfer some torque for some short amount of time to get down and figure out what the problem is. But according to the documents with the prop, the torque is transfered via friction between the prop aft face and the crank flange forwards face.
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