REFLECTOR: Cabin Heat - Damper Install

[Mark Magee]

All the former/current Long EZ drivers will be familiar with this NACA vent pictured here:

http://www.seehere.com/badflyr/rv-4_vent

These NACA vents were per plans and were turned on and off by a knob with a threaded rod: all Longs had at least one installed. The one on mine was centerline on the glass structure fwd of the canopy and provided excellent cabin ventilation and was adjustable from fully OFF to MAX and everything in between. I don't see why the NACA scoops on our front oil coolers can't have a 'door' hinged at the very front (very bottom of the 'V'). At the top of the V would be the adjuster. It would be adjustable from OFF, (door fully flush with contours of the fuselage) where cabin heat could now easily be recirculated with the install of one of the fans mentioned in this thread (I like the idea of the bilge fan: I was a Navy man...). As well it could be fully opened (top of V pulled to the bottom of the NACA recess) for warm weather and everything in between. I don't know on the fully opened config how much less airflow over stock would occur due to the alteration of the depth of the leading edge of the NACA however. Yet as has been posted, if the air does need to be slowed down a little for heat soak to occur, a short throw 12V solenoid moving the door would provide an opportunity to find the 'sweet spot' to warm weather cooling. I know some guys have already adopted this concept successfully, I just wonder if the install might be a little easier with a door that simply mirrors the NACA cutout.
Anyone remember those cabin ventilation vents on the Long EZ's? They worked well. I heard the company is out of business and the vents no longer available on Spruce.

http://www.vansairforce.com/community/showthread.php?t=58698

Mark B. Magee
N34XL XLFG 300HP 80HRS
Sent from IPhone 4

On Jan 16, 2012, at 12:03 AM, "Ruben Creus" <ruben at vainneg.com> wrote:

> John, 
> 
> Would this also allow you to keep air flowing into the cooler while on the
> ground on a hot day? If that were the case then you kill to birds with one
> stone!
> 
> Ruben
> 
> -----Original Message-----
> From: John Dibble [mailto:aminetech at bluefrog.com] 
> Sent: Sunday, January 15, 2012 8:06 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Cabin Heat - Damper Install
> 
> This 3rd pic is of the blower which sits on top and partly inboard of
> the naca.  The blower is a 3" bilge blower.  Even though the door is a
> close fit, a lot of air escapes by it because there is a lot of
> resistance going through the cooler.  That may be the reason others
> aren't getting enough heat with the blowers.  A perfect seal is needed
> to get all the air to go through the cooler.
> 
> John
> 
> _______________________________________________
> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
> 
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html