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Hi Bob, and any others watching,
Not good news regarding my mod this week. That first roll down must have been a fluke. I have see 1 to 2 mph dropps in speed down the hill during the driving this week. The only one good day (dry road, trailing wind, but cold - 35 F) I had a 2 mph drop in speed.
So, there might be some improvement, but little if any.
I also got a veiw of water droplets behind the turbulator. When the droplets are big, the patern behind the turbulator is little different that in front of it. When the droplets were a fine mist, there was some change in the droplet pattern, turning into what looks like a flowing stream pattern.
So, the turbulator is not turbulating very well. I could double the number of spikes on it. Right now there are 13 spikes across 19.5 inches, and the spikes are 1 inch deep, and the total turbulator length (in the direction of flow is about 4.5 inches. Which makes a 2.5 inch flat section between the leading and following spikes.
Or, I could go to a zig-zag tape style pattern, and hope the magnetic material holds. , where the zig-zag length in the direction of flow is equal to the depth of the spikes. So, that would be 1 inch deep spikes, with 1 inch from the tip of one spike, to the rear inset tip.
Or both (double the spikes - spike depth 1/2 inch), with 1/2 inch wide tape.
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