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Building Integrity
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Date:  5-21-2016
Number of Hours:  0.50
Manual Reference:  Section 2
Brief Description:  A smidge better

I was able to quickly fabricate a low pressure lip from some scrap metal and rivet it onto the lower cowl ahead of the cooler plenum exit duct. Today airport conditions were almost identical to yesterdays so I wanted to fly it and see if this would make a marked improvement. It did, but not enough. I saw maybe 3 or 4 degrees improvement from this draggy lower lip.
At this point, I'm going to be adding a turning vane inside my Naca duct where it expands rapidly and there may be some turbulent airflow. Gary Hertzler believes that if the air is separating inside the expansion chamber, then it can be fixed using a vane and re-directing air correctly. I also know that having my voltage regulator inside the naca duct isn't helping the airflow at all and may need to be relocated elsewhere. It would be an easy thing to remove, tape over the hole and see if it makes a big difference before adding the vane.
For now, the next step will be removing the oil cooler exit plenum, removing the cooler and voltage regulator, getting a baseline temp, then adding the changes necessary from that point forward. In order to get more standard oil temps (180), I wouldn't be surprized if it required the addition of a second oil cooler in series and a large scoop. :/
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riveting on the low pressure lip

riveting on the low pressure lip

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Per Rutans drawing

Per Rutans drawing

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