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Larry Winger's 601XL Project
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Date: 1-27-2009
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Number of Hours: 0.00
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Manual Reference:
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Brief Description: NOTE ON TOP SKIN DIMENSIONS
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In my previous post I mentioned the discrepancy between the dimensions called for on the plans between the three bulkheads and my experience in the real world. Yesterday i followed up with Travis at ZAC and he was very helpful. The plans show the angle of the middle bulkhead at 84 degrees, but show no angle on the baggage back and aft bulkheads. On the other hand, all three have a bottom flange set at 84 degrees, which would imply that they should stay at that angle. Travis agreed but recognized that the dimensions on the plans for the top-to-top locations didn't sound right. He measured on the 650 made by Zenair that they keep in their shop, and it agreed with the plans. Turns out that this is probably because Zenair made the prototype, put their skin on, liked the way it looked and measured the distance off the plane, not from predetermined calculations. In reality, the baggage back bulkhead on the Zenair 650 sits at 82 degrees --- and everything still works! So the distances on the plans will produce a back-tipping baggage back bulkhead. In CAD, Travis calculated that the dimensions from aft to middle should be 646.5mm and from middle to baggage back should be 875.2mm. That should maintain 84 degrees on all bulkheads. Having said that, he indicated that all that really matters is that the top skin fits and looks nice, and that the baggage back bulkhead is somewhere near 84 degrees. Obviously the point in space created by the front edge of the top skin as it relates to the canopy (installed later) is not hyper critical.
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