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Hi Xringer,
I am no expert! But, the trailing edge may be too far back. Do a google of "turbulator tape" and they show the usage in sailplanes.
The problem is if the tape will add more drag than it reduces. Or a similar amount of drag then it reductes.
I doubt the same effect as a boat tail could be achieved with turbulator tape. The use in sailplanes is on already nearly perfect shapes.
I think ebdso's experience is where there are drag inducing vortices forming. These are in the areas where the top and sides of the vehicle come together, and there is a change in shape axially.
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