Sorry, Mindbender04, you still haven't convinced me.
First of all, the initial challenge is to support such a loop. That doesn't need to be difficult, as such a loop will have to shift to the left or right of the launch track anyway. It would probably be necessary to include structure bridging the launch track, but the earliest looping coasters, the ones with the trusswork, demonstrate an elegant way of handling that.
The next step is to work out the design of the element itself. Vertical loops are dead easy because they have been part of coaster design for so long. The trick in this case is that the launch track leads into a vertical loop, but the pull-out from that loop, instead of pulling out into a return hill, pulls out right into a second loop. But instead of arcing over the top, the second loop just goes straight up at a tangent to the vertical portion of the loop. So what's the problem?
In practice it might prove easier to construct the thing in such a way that the bottom of the loop is actually below the launch track, something along these lines (hope it works...)
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--Dave Althoff, Jr.
*** This post was edited by RideMan on 6/25/2001. ***