REFLECTOR: Nose OIl cooler scoop flaw

[Carl Hoffman]

---- Original message ----
>Date: Fri, 09 Oct 2009 18:49:49 -0600
>From: Scott Derrick <scott at tnstaafl.net>  
>Subject: REFLECTOR: Nose OIl cooler scoop flaw  
>To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>
>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?

Maher designed a better scoop for FG Velocity.

>
>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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