r-pod Airflow

Note how many pressure pulses are produced by simply adding the A/C to the roof.  There is a build up not only much higher at the upper rear...but also a pressure field out in front of the R-Pod.
I think that the A/C on the RP 170+ units with its longer roof line and using a longer and higher
TV helps keep the flow much smoother (see Outbound's flow images at the beginning of this thread).
It appears that by moving the A/C to the roof of the RP-151, Forest River really decreased the
efficiency of the RP-151s.  I wonder how much less mpg I will be getting from the 2010 Pod versus
the older units?

A comment was made about airflow over a pickup truck... I used a 2010 Ford Extended Cab with
a length of about 221 inches.
The first image is an 'open box'...Flow Illustrator does a two-dimensional analysis, so the PU box
looks like an open box with a tailgate on the end: suprisingly the flow was quite smooth over the R-Pod...the open box not doing much to the flow.  There were large amounts of pulsing behind the R-Pod and upward from the pavement behind the rear (suggestion...cover the box!)
The second image is a 'closed box'...a covered box...there were some lower frequency pulsing
at the top rear of R-pod and some rear pavement upward pulses
The third image is with a truck 'topper' covering the box...there was also some pulsing at the top rear of the R-Pod the rear upward pulses were more gentle
Putting a 20 inch wind deflector at the back of the pickup cab suprisingly caused both pulsing at the top rear and lower rear of the R-Pod...not very efficient flow
Moving the wind deflector to the rear of the topper really smoothed the flow...no upper pulsing, no longer period pulsing, with a nearly constant low pressure zone at the lower rear (probably the
most efficient flow of any of the cases!)

Has anyone tried adding a deflector to the back of the 'pod?  I'm thinking at a 45 degree angle, mounted above the rear window.  That should even out the airflow back there.

Ah, I missed that first time around.

Butterfly_Lee
The following is just my opinion.  The pictures and "airflow analysis" are a nice visualization of one set of conditions with the model presented and the boundrary conditions in the program.  The author of the program warns that the results are "not " a scientific result and should be considered a work of art and not a scientific result.  Now, that is not to say the results don't have worth , they do and can provide some 2 dimensional visualization of air flow across the various vehicles and r-pods.  I have enjoyed seeing the contributions and look forward to making my own when I get my Pod.  You should not put to much credence in the results you see as far as making a judgment of gas mileage etc. First of all I don't think the program allows input of vehicle speed etc to set the criteria under which the airflow takes place.  I have purchased a devise called a "scan gauge", which will give me instantaneous gas mileage, transmission temperature, alternator output, and several other readings and plan to use the hard data I get from the gauge readouts to improve my driving habits to improve gas mileage.  Maybe somewhere down the road, I may fool around with spoilers etc but for now I just plan on enjoying the R-Pod as much as I can when I receive it.   Bottom line is to go enjoy your r-pod and don't worry too much about the gas mileage.  Remember back a few years when all the big rigs had huge spoilers mounted on the tractors ?  How many do you see today ?  I don't think they helped as much as the people selling them said they did.