REFLECTOR: Retrofit NACA from armpit scoops

[Brian Michalk]

That's what I did, except I built my own variable inlet scoops. It would 
be simple to keep the standard scoops so they are not attached to the cowl.

Andrew Judge wrote:
>
> I’m a little concerned about high temps. I seem to have them now (semi 
> high temps) and want to get the temps right and make it easy to take 
> the cowlings off. I also have a second oil cooler, but both cyl and 
> oil seem a little high.
>
> Maybe I can keep the scoops and cut those out of the cowling and 
> fasten them permanently to the wing roots?
>
> Thanks!
>
> Andy
>
> *From:* reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] 
> *On Behalf Of *Chuck
> *Sent:* Monday, October 26, 2009 1:06 PM
> *To:* Velocity Aircraft Owners and Builders list
> *Subject:* Re: REFLECTOR: Retrofit NACA from armpit scoops
>
> Andy, I switched from the armpit scoops to the overhead NACAs when I 
> switched from the Mazda 20B to the IO360. It wasn't that big a job, 
> but it does take some time to repair the lower cowl and to cut and 
> paste the fuselage to accept the NACA ducts. Initially I had cooling 
> issues with the NACAs until I tightened the plenum clearances and 
> added 5/8" VG's.
>
> I'm just finishing adding a turbo and a second oil cooler (factory) 
> which mounts in-between the inlet NACAs. I've added the factory 3" 
> oval air scoop to the upper cowl that feeds directly to the oil 
> cooler, but is not totally sealed to the oil cooler face. I did this 
> because I was getting a pretty hot upper cowl and I think this will 
> help force cooling air into the upper area and when shutdown will 
> release hot air out of the scoop opening. I went with a scoop because 
> the boundary layer is pretty thick that far back on the fuselage and I 
> wanted to get clean air. I'll be doing taxi testing soon and will let 
> you know how it works.
>
> By the way, you can get the factory scoop in either fiberglas ($35) or 
> carbon fiber ($45). I'm using the carbon which is stringer, lighter 
> and has a smaller opening profile.
>
> Chuck H
>
> *From:* Andrew Judge <mailto:ajudge at grovenetworks.com>
>
> *Sent:* Sunday, October 25, 2009 9:32 AM
>
> *To:* reflector at tvbf.org <mailto:reflector at tvbf.org>
>
> *Subject:* REFLECTOR: Retrofit NACA from armpit scoops
>
> I was wondering if anyone on the list done the change from armpit 
> scoops to NACA cooling?
>
> I really want to make the change due to maintenance and cooling on my 
> Standard Fixed. The SCAT is killing me every time I have to remove the 
> cowlings.
>
> If so, what difference in ease of maintenance, cooling and speed (if 
> any) have you noticed? I'll probably do the down exhaust too.
>
> I also have a second oil cooler aft. How do you route air into that?
>
> Andy Judge
> N55AJ
> KTMB
>
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