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  #11  
Old 12-05-2017, 06:48 PM
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Onewinglo Onewinglo is offline
 
Join Date: Apr 2016
Location: Hammond, LA
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Thanks for the reply guys. Yes 84 inches is correct. The opening measures 13.750" wide (at the middle of the trapezoid) and 6.125" high.
My partner and I were looking at how we could cut and raise the bottom about 1.125" (due to the exhaust) but that leaves us with a 68" opening - still very big. I love the idea of different size openings as Dan made but I don't think we are up for that.
Currently we are thinking we can raise the bottom an inch or so and extend the cowling aft a few inches to take advantage of the ramp to further close the exit area.
Hopefully my photo of the exit area will display.
Thanks again for the help!

https://photos.app.goo.gl/KLIxjfuaOH2skVZ62
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  #12  
Old 12-05-2017, 07:26 PM
jrs14855 jrs14855 is offline
 
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Default Dave Anders

Dave Anders has done a series of articles for Kitplanes over the last few months. I'm not sure how detailed the cowl info is but his outlet is substantially smaller than inlet. The articles do cover the importance of the proper transition from the inlets to the main plenum. I think the current Kitplanes is his final article of the series.
There is also an article about Dave's presentation years ago, I think to a Sacramento area EAA Chapter.
Dave has a highly modified IO 360(angle valve) with modified Hartzell CS in an RV4. I believe it is the fastest RV4 on the planet.
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  #13  
Old 12-05-2017, 09:23 PM
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AX-O AX-O is offline
 
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Out of curosity, are subtracting the area of the exhaust pipes blocking the exit?
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  #14  
Old 12-06-2017, 11:59 AM
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Onewinglo Onewinglo is offline
 
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Axel, no I did not subtract the area of the exhaust - good point. Makes the exit area a little less Huge.

jrs14855, Thanks for the note about the Dave Anders articles in Kitplanes. I found the second article and will read it tonight.
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