REFLECTOR: Re: Cabin Heating

[Rene Dugas]

Ron,
The variable floor NACA's might be easy to build but I would think they
would be difficult to seal to maintain high pressure above the engine
and low pressure below for cooling.  Just blocking off the oil coolers
has worked well for me and is KISS.  I know we are experimenters but
engines are expensive.  What we want is a cool engine and hotter oil
temps.  A closed air flow through the front oil cooler and back inside
driven by a bilge pump fan is my next project for winter.  Recycling
warming air should work and adding a little cool air from the overheads
is usually the most comfortable and pretty simple.  I'm looking for a
1.5 inch bilge fan to make it easy to place inline with my heating
system.  I am already wired.
Your mileage may vary.
Rene'


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Ron Brown
Sent: Wednesday, February 22, 2006 9:17 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Re: Cabin Heating


I still think it would be OK to make some NACA scoop inserts to use for
cold 
weather (less than 20-25 degrees which is when the Vernatherm seems to
stop 
sending hot oil to the cooler).  These would just slip into the NACA and

reduce the opening by say 1/4 to 1/3.  They could be held in place with
a 
couple of screws in the front, the back being held in place by the NACA 
opening.

Another approach is to use variable floor ramps in the NACA.  Vlad had
built 
some for his Velocity a while back, but he still isn't flying.
Basically, 
the bottom of the NACA opening was hinged at the front with a mechanism
to 
raise the rear portion upward to reduce the airflow.  As with any cowl 
flaps, you would need to monitor engine temps.  With modern (like GRT
EIS or 
other engine monitors) a high CHT alarm could alert to open the NACA
ramp. 
With the removable insert, just watch temps on the climb out and lower
the 
nose when the CHT's get too high.

The variable bottom on the NACA should be pretty easy to implement for
those 
of you who live in the frigid north and are still building.

Ronnie Brown
Cornelius, NC - in the not-so-frigid Southeast.


----- Original Message ----- 
From: "Dr. Golf" <drgolf369 at yahoo.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Wednesday, February 22, 2006 9:21 AM
Subject: Re: REFLECTOR: Re: Cabin Heat 12 volt


>I have been working on keeping the draft out. The boys
> at velocity helped install a rubber seal around the
> nose gear where it exits the cabin. I installed
> inflatable (electric pump)door seals and they work
> perfectly (quiet also). I have recently covered the
> opening in the keel around the canard control rod with
> 1" insulating foam rubber (not too tight). I placed
> the same foam on the back of the rear cabin panel (
> not the firewall) and snugged it tight where it
> contacts the cabin walls, top and floor. I placed a
> vinyl cover over the back of the instruments drapping
> it forward to the front of the canard.I created a
> silicon seal around the canard cover.
>
> When the engine pumps the oil to the oil cooler in the
> nose, I am as warm as a bug in a rug, but because of
> the oversized scoops, this is tough to do in the cold
> weather  without exceeding 200 knts.
>
> My next project is to create a seal between the nose
> gear doors.
>
> Your description of the blanket sounds great!
>
> Any other suggestions?
>
> Perhaps if we kidnap Dwayne and the Scotts and make
> them fly with us in the freezing north, I bet within 2
> weeks, there will be mods avaiable to practically
> pressurize the cabin! What do you think?
>
>
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