Thanks for the encouragement everyone.
Unfortunately I probably do have seperation. I don't have the mileage logs posted but we took a 150 mile trip yesterday and... no difference in mileage, up or down. Once I'm back from vacation I will do some tuft testing, expecting to find lots of swirlies.
The biggest mistake I probably made was to go so far in building before I was able to test my work. I knew I was pushing the limits but if I have to cut it back apart and raise it up the world hasn't come to an end. (I will have to give my long-suffering wife some attention first though
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CarloSW2: It is really just one angle and that is at 18 degrees. The foreshortening from my photo not being taken perpendicular to the truck is fooling your eye. Also the upper angle you're seeing is the 30in chord radius I used in my attempt to sweet talk the airflow into my steep angle.
Bondo: Thanks for reminding me you had a false start. I still am a fan of aeroshells and have learned a lot with this one. I'm not sure what my plan is at the moment but there are several options ranging from a spoiler at the back, doming the hatch, VG's, all the way up to cutting it back apart and raising it up. I will let testing drive the decision making process. I will probably take you up on you offer in a couple of weeks.
Neil:
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It should have a small vertical surface at the back, instead.
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Now you tell me!
aerohead: Thanks for the workmanship compliment. Like several in here I work in engineering and really couldn't convince myself to do anything less. (Personality flaw but what can I say) That said 40 feet is about the right viewing distance. Much closer and the flaws really start to show.
Big Dave:
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As you know, windows are a complication, and I question just what you can see through rear windows laid over that far.
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Not much but it's my shell and that's how I wanted it.
Actually it wouldn't be so bad if I hadn't used limo black tinting. With the rework that's already in the future that will probably come off. Then I can use it as a mobile greenhouse in the winter.