REFLECTOR: Engine cooling NACA scoops

Brian Michalk michalk at awpi.com
Wed Jul 16 21:43:15 CDT 2008


The Guru, otherwise known as Andy Millin uploaded a nifty Excel 
spreadsheet that calculates NACA dimensions.

http://www.tvbf.org/docs/NACA%20Submerged%20Inlets.xls


Dave Philipsen wrote:
> I have been struggling with marginal cooling on my STD FG equipped with 
> armpit scoops.  The only way I can keep cool enough during cruise is to 
> fly above 6000 feet and run LOP.  I have been somewhat successful at 
> bringing the temps down by repairing/reworking the baffling and seals as 
> well as doing a little rework on the scoops themselves but I'm still not 
> happy with it.  I'm seriously thinking about retrofitting it with the 
> overhead NACA  vents and downdraft cooling.  My question is:  Does 
> anyone have templates that I could borrow/acquire so I don't have to 
> guess about the size and positioning?  Also, should I expect to see a 
> small improvement in cruise speed with the NACAs after removing the 
> armpit scoops?
> 
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