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Kurt Haller RV-9A
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Date: 8-27-2017
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Number of Hours: 0.00
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Manual Reference:
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Brief Description: Set incidence and drill rear spar
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Measured incidence with the block and level according to the plans at 7 places along each wing's span, from tip rib to root rib and every other rib in between. Measurement at each place replicated 3 times. Difference in incidence (left minus right) was 0.019 +/- 0.026 degrees; in other words, no significant difference.
Clamped the left wing with the tool described in the 8/26/2017 entry. The vise grip has a hex socket in the tension screw, so light pressure allowing repositioning could be used initially, then turned up to max once the edge distances were good all around.
I used a tube with 1/8" ID and 1/4" OD in the 0.25" drill bushing to center a 1/8" drill. Image 1 taken after drilling this 1/8" pilot was complete. A cleco making sure nothing moves while incidences were remeasured (these data were not recorded). The used a 1/4" drill with the 1/4" bushing to enlarge the hole once, an N drill (0.3020") with a 0.302 bushing to enlarge the hole a second time, then finished to hole with a 0.3110 reamer and 0.3125 bushing. (Bushing used with the reamer deliberately 1.5 mils oversize to facilitate chip removal.) The beautiful round hole, dead perpendicular to the rear spar stubs, w/ 5/8" e.d. to everything shown in Image 2. An AN5 bolt is a light drive fit into the hole. Huzzah!!!
Did likewise for the right wing. After AN5 bolts installed, remeasured the incidences and found the difference to be 0.036 +/- 0.046. Again, no significant differences. Incidence raw measurements are in the spreadsheet C:DocumentsRV9A DocsWingIncidenceMeasurements.xlsx
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After 1/8 pilot drilled,
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After final reaming
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