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Larry Winger's 601XL Project
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Date: 6-26-2008
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Number of Hours: 2.75
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Manual Reference:
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Brief Description: Added and leveled front top longerons
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I should count, but there seem to be a dozen different leveling or height measurements that all need to be taken for the fuselage to be square and straight. Of course, adjustments to one have an impact on others. The "starting place" should actually be "places": a level sawhorse/beam platform and a level frame on the ground from which to measure up to certain parts. Last night was mostly about the level sawhorse/beam aspect of the job. Tonight focused on the ground up measurements, so I started by making a frame of cross beams on the floor which I leveled in both directions. Next I measured to a mark on the rear side skins 22mm from the top. That is supposed to be identical to the measurement to the bottom of the upper engine mount. When I started it was about 3 mm high at the front, so I removed some of the spacers under the front of the firewall, readjusted the angle of the firewall and remeasured everything. To be honest, I remeasured everything about 6 times. The final step is to clamp the longerons in place and check for level. Voila. I'm quite pleased with how true my fuselage appears to be. NOTE: If you are following along in the photo assembly guide, you may notice that I did not drill and bolt the engine mount yet. My advice is to wait. There are just enough moving parts in this area, that I would advise not riveting the firewall or drilling the upper mounts until you have clamped the longerons to the bottom side of them. You may find, as I did, that you have clearance issues which need to be addressed by trimming. Also the slight downward flange on the BRS-style mount creates an interference issue with the rear firewall reinforcement (6-B-7-2). I'll be checking with ZAC before drilling to be sure of final placement.
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Fuselage with leveled front longerons
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Looking back from the engine mount
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Detail of BRS-capable engine mount and longeron
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