REFLECTOR: Re: Cabin Heating

Milton Mersky miltonm at airmail.net
Tue Feb 21 21:50:02 CST 2006



Andrew:

I would like you to speak at the Velocity Symposium on the subject of 
cooling/heating of the engine.

Will you attend?

Milton Mersky




----- Original Message ----- 
From: "Andrew Ellzey" <ajlz72756 at yahoo.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Wednesday, February 22, 2006 6:36 PM
Subject: Re: REFLECTOR: Re: Cabin Heating


> Every high performance complex general aviation aircraft that I can think 
> of, has cowl flaps. They are not only important for summer and winter 
> operation but for high altitude operation. You can actually hurt your 
> engine from to much cooling. The choke in our cylinders is there for a 
> reason. It is intended to allow the cylinders to become a straight bore 
> when the cylinder temperature is at the correct operating temperatures. If 
> you are running your engine too cool, you could be prematurely warring out 
> your rings and cylinders. There is a very easy way that I see that a 
> butterfly type valve could be added to the NACA scoops. These two 
> butterfly valves could be controlled by a push pull cable located inside 
> of the ceiling fresh air duct, having a lawn mower type throttle control 
> also mounted in the overhead duct. I flew a 1964 M20E for 15 years that 
> had the original oversized air intake. I was able to control my oil temp 
> using the cowl flaps very easily. I was going to draw all a diagram of the 
> NACA butterfly valve that I have in mind, but didn't have time today. 
> Remember the Butterfly valve shouldn't completely close off the air, only 
> provide control over restricting air flow. So the valve in the closed 
> position shouldn't block any more than about 30% of the air flow.
>
> My thoughts.
>
> Andy Ellzey
>
>
> ----- Original Message ----- 
> From: "Rene Dugas" <dugasd at bellsouth.net>
> To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
> Sent: Wednesday, February 22, 2006 5:24 PM
> Subject: RE: REFLECTOR: Re: Cabin Heating
>
>
>> 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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>
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