REFLECTOR: Nose OIl cooler scoop flaw

[Scott Derrick]

Hmmm..  In the climb that may work.  In cruise I think the current exit
location is at a lower pressure than the inlet.  Not sure where you
could find a  lower  pressure area forward  of the windscreen?

Scott

aminetech at bluefrog.com wrote:
> I've wondered if taking the inlet air from the bottom (higher pressure) and exiting out the top of the fuselage (lower pressure) would improve cooling?
>
> John
>
> --- scott at tnstaafl.net wrote:
>
> From: Scott Derrick <scott at tnstaafl.net>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: REFLECTOR: Nose OIl cooler scoop flaw
> Date: Fri, 09 Oct 2009 18:49:49 -0600
>
> I would like to improve my oil cooling, most would.
>
> I was looking at the scoop on the nose, thinking that is not a NACA
> scoop. Its depth to width ration is all wrong, its got a round bottom
> and worst of all the forward end or entry edge of the scoop does not
> smoothly enter the scoop, it drops over a step?
>
> I know, its not a NACA. It looks kinduv like one if you stand far enough
> back, its really a flush mounted RAM scoop made to look like a NACA if
> you squint your eyes real tight.
>
> But, even as a flush mounted RAM scoop it has one fatal flaw that it
> would also have if it were a NACA scoop.  The entry edge has a d*** step
> in it?  Looking into the scoop from the in flight air's perspective, it
> trips over that entry step down into the round bottomed scoop, sets up a
> huge turbulent roll right at the entry!
>
> Why did Maher or whoever designed the scoop do that?  Didn't know
> better?  Didn't think it would matter? Its the same NACA'ish looking
> scoop on all the Velocity's that I have seen.  Do new kits have a better
> designed scoop?
>
> Well, whatever...
>
> My question is has anybody sanded/grinded/cut a nice smooth entry into
> the nose cooler scoop?  And icing on the cake would be if you've flown
> with the horrible(in theory) original and then fixed it with a smooth
> entry?  Noticed a difference in cooling efficiency?
>
>
> I'm wondering if cutting into a brand new paint job to do that is worth
> it?   Maybe  it gets so much ram pressure  that fixing the design flaw
> would not increase the pressure in front of the cooler  in a measurable way?
>
> Scott
>
>
>
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