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![]() I'm building a wing. Outta aruminum, as per Riveting 101. Just finishing fitting the lower skins around the landing gear legs. Rivet holes are all done; the thing is at the Bristle Stage although most of my bristles are PK's instead of clecos because the former are about two cents each and clecos aren't. Landing gear structure. Nicely triangulated 4130 leg attaches to an aluminum spar so that the loads appear in shear across three fasteners, a pair of AN4 bolts to more-or-less hold things in position so the major load can be taken by an AN6. Be nice if I could take a peek at that AN6 before going for a ride, when I'm wandering around wiggling the flippers and knocking off the pee-toe toobe with my knee. AN4's are no problem since their nuts are hanging out. But those AN6's are tucked up there under the spar caps, torqued to about a zillion foot pounds (or mebbe jus' 190 lb/inches...) inside of the wing and the inspection panel for that bay, which is also the hole for getting the bucking bar in there, is on the bottom and it's a low-winger and the panel is nut-plated flush with half a dozen #8 flat-head Phillips. Fifty-hour inspection stuff, not pre-flight. Actually, there IS a way to see the fastener without dismantling the wing, via a drain hole where the lower skin is riveted to the rear spar. I'm a big fan of Zinc Chromate. And I love drain holes. Nothing fancy, just bopped the edge of the panel over a quarter-inch rod so it forms a little tapered channel. Sorta like fluting the flange of a rib but going the other way. Get down on your handzankneez, peek through the drain hole, you're staring right down that AN6's throat. On the bench with the top skin off you can see it clear as anything. Only trouble is, put the top skin on, the inside of the wing is blacker than my fingernails. Tried poking various light-wands through the hole... nada. So I installed a pair of ultra-bright white LED's on each gear leg. Twenty-six gauge wire and no ground return; dropping resister at the switch, salvaged off a circuit board and about as big as a pea. Less than two ounces for the whole sheebang. Sat out there behind the shop scaring the possoms with my tiny little lights, mazed at what a smart feller I was until the wife turned the hose on me, told me to come to bed or she'd lock me out. Good thing I put in them drains :-) -R.S.Hoover |
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