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Building Integrity
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Date:  7-17-2016
Number of Hours:  0.50
Manual Reference:  Section 2
Brief Description:  Lezz make a mold

Unfortunately, this perfectly designed and well working Naca Duct is saying goodbye. The ugly truth that NACA ducts are not good for oil cooler application is just something I'm going to have to accept. The good news, however, is that I only have to design the forward portion of the intake scoop as the aft expansion chamber is already complete. Now the trick will be to design a low drag, well designed pressure recovery scoop that will FINALLY get my oil temps down. Here is some solid tested data that I've been able to come up with:

Another UL owner that runs the 200hp model is using a 3" inlet tube feeding a 13 row cooler on the firewell that dumps the air into the cowling. This is really good news for me that he's getting 200 degree oil temps in cruise on a hot day. now a 3" opening is only a mere 7" sq. of inlet area. The cooler face on a 13 row cooler is about 50 sq. in. That means he's got a massive amount of expansion going on and with such little air is still getting great temps. My engine produces 40hp less and is using only an 8 row cooler so I could probably get good results using the same 7in. sq. BUT, in order to really nip this thing in the butt, I'm going to open it up to about 9-10sq. in which will give me a 1:3 expansion ratio. This should also make for a relatively small inlet which should not protrude in an ugly way. the lines should come out real nice.

Step one, I covered the belly with duct tape. Step 2 will be building a lower dam and spraying it all with a mold release for easy removal of the x-30 foam. This should be fun :)
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Belly tape is on

Belly tape is on

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