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My Airplane Projects
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Date: 3-17-2010
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Number of Hours: 3.50
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Manual Reference: 38-02
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Brief Description: Worked cowling halves toward scribe lines.
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Got into shop this afternoon. Probably the only time this week due to good weather and pent up flying demand. Solo'ed Bob and Kurt. Working instruments with 3 students. Everybody wants to fly a lot! Ah, Spring!
Finished going over the scribe lines with the ultra fine Sharpie. Ran it out of ink, got to get another one. Used the Dremel with the reinforced cutting disks to rough cut back to 1/8 to 1/4 inch of the scribe lines.
Cut back farther using 60 grit paper on the orbital sander, then used 80 grit on sanding blocks to smooth and get closer yet. Top cowl is pretty close to done, still working bottom cowl.
There is one mystery that caused me to screw up, but not castastrophically. There is a scribe line across the curved prop opening on the lower cowl half. I foolishly assumed this was to be treated like all the other scribe lines, and cut material off to within about 1/8 inch of it. Then noticed in Figure 1 on Page 38-02 it does NOT show this area being trimmed. Then why the scribe line? The upper cowl half does not have the scribe line.
Thank goodness I discovered this before I cut all the way back to the line, so only minimum materail was removed.
In order to recover from this I will wait until I have joined the two cowl halves, and then trim the upper cowl to match the lower. It doesn't really matter, since this area will be behind the prop spinner anyway. Whew, that was a close one!
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Cowl halves rough cut.
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Scribe line on lower cowl prop opening.
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