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Building Integrity
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Date:  5-11-2016
Number of Hours:  3.00
Manual Reference:  Section 2
Brief Description:  ERRCHH. Record scratch...

So remember that fan shroud I was making? ya, I couldn't see that working out after taking the fan to the airplane and seeing it as becoming a massive annoyance. My gosh, back in the mail returned to Jegs it goes. I'm convinced I can get these oil temps down without it even if it means a P51 Scoop on the bottom.
I had a good long talk with an aviation consultant last night who has worked with UL power engines now for over 10 years and told me exactly why the 6 cylinder engines all have oil temp issues. NOT ENOUGH OIL> We only get 4 qts. of oil to cool the engine and it's just not enough cooling power. Install a massive oil cooler and now you've done the same thing, added more oil. It's truly a design flaw that makes it easier for me to sleep at night knowing that all my efforts have not been in vain. Shame on you UL. I'm not the only one with oil temp issues.
I've decided to go ahead and use the old plenum that I gave up on after 1 test flight, but to open it up so that the exit area is the same as the cooler face area. I also microed the inside for a nice smooth contour and will be adding a lower lip to the cowling like a P-51 has which will create a low pressure area ahead of the cooler exit as Rutan recommends. First, a test flight without the lip. Then added as neccessary. Finally, if this doesn't lower the temps enough, the entry ducting will be opened up and then finally a scoop added. After that, 25 hour oil changes and hot oil for the rest of this engines life. This is it. This 2 year battle will end here.
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Old plenum about to get mods

Old plenum about to get mods

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New larger opening on cowling

New larger opening on cowling

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Micro inside plenum

Micro inside plenum

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