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About 5 years ago I provided Van's an analysis of the canopy fit problem that was directly related to the width of the cabin. This is a manifestation of the same problem.
It appears that there is no structure to control the upper cabin width at the spar station. This leads to the canopy track fish-mouth problem, plus a need to (often) cut and weld the canopy frame to make it fit. I did a survey of several RV's with sliders and measured the cabin width at the roll bar and interviewed the builders. There was a positive correlation between width and canopy fit problems. Total width variation was in the order of 3/8 to 1/2 inch as I recall. I wish Van's would publish this dimension so builders can fabricate a jig when building the fuse. Better yet, they should use a jig at the Quickbuild factory. See http://www.vx-aviation.com/rv-9a/Tips.html |
While I understand your frustrations with this and other problems Vern. If Vans published what you are asking as well as all the other head scratchers that we encounter during the build, then we would finish up with an instruction manual twice as large as it is and this in turn would create more confusion with the manual. The manual needs to be kept as simple as possible while still retaining all the information to be able to complete the build. I back this up with my own experience.
As part of my company we supply race cars in "you-assemble" kits. Our assembly manual used to be very comprehensive, but we used to get a lot of phone calls from confused builders. I overcome this problem by re-writing the assembly manual using the "KISS" princible. The manual is now half as thick as the old one and I would get less than a quarter of the calls I used to get with the old manual. The secret is not to lead the builder by the hand and have them running back to you everytime they strike a hitch, but direct them where to go and thus encouraging them to think more for themselvs and to think more ahead, then in most cases they will see a problem before it becomes a problem, or nut a problem out before they ring for help. As I have already stated in my earlier post, I finished up with this fish mouth eye sore on my left slider rail and I lay it squarely on myself for not checking the width of the fuse at that point before charging at the gate and modifying the slider track to this extent. I discoverd my stuff-up when I came to mount the right slider track and measured across. I then re-mounted the left track. If I had of done the measurement before mounting the left track, I would not have had this eye sore! Bob RV9a slider |
You are both right.
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