REFLECTOR: Need for Cabin Heat at Altitude

[Jack Prock]

I’m now going to answer my own question... so someone else may benefit.

After searching again for a 12-volt squirrel cage blower, I stumbled across this:

http://www.suremarineservice.com/008-A37.aspx

It should work really well, it is about the right size, with 150CFM, 
and set up for 3 speeds.  12 V  @ 5 amps

I will just have to create a mounting bracket.

If anyone else is interested in this, it will be a few weeks before I get it installed,
but I will let you know.

Jack

From: Jack Prock 
Sent: Tuesday, June 25, 2013 2:33 PM
To: Velocity Aircraft Owners and Builders list 
Subject: Re: REFLECTOR: Need for Cabin Heat at Altitude

Yes, please give fan manufacturer, part number, and where we can buy it.

After finding that the bilge fan that was originally discussed a few years back
just won’t push air through the oil cooler, I have spent several hours online 
looking for just such a fan. But, have yet to find a 12 volt, reasonably compact
fan that can do the job.

I would be REALLY interested in receiving any information you have.

Jack
From: Brian Michalk 
Sent: Tuesday, June 25, 2013 11:07 AM
To: Velocity Aircraft Owners and Builders list 
Subject: Re: REFLECTOR: Need for Cabin Heat at Altitude

Where did you get your fan, and what part number?

On 6/25/2013 12:33 PM, Ruben Creus wrote:

  We just did a similar thing than what is in the email below. We install an squirrel cage fan, and a flap on the oil scoop. Different tests show that for this magic trick to happen, there one very important requirement. And that is, “a perfect seal” around the flap. First, you need to build up air pressure in front of the oil cooler to force the air into the radiator. Second, a bilge fan cannot work under pressure, but a squirrel fan does. A squirrel fan is designed to work under air pressure losing just few CFM. A bilge fan will lose most of its CFM under pressure.

   

  I did a test in winter and summer, and finally installed it last week in with the help of the Sebastian folks. Scott did a super detail job there!  We achieved a perfect seal, and we are using a squirrel cage fan with 105CFM. The results were impressive. It blows a good amount of air, maybe 1/3 of what you would get with the flap open in flight, but it looks to be good enough to blow a good amount of air. But again, to build pressure in front of the radiator you need a perfect seal. Otherwise, air will escape, no pressure will built and all the effort will be a waste. Remember, this can only work with a squirrel cage fan. A regular bilge fan cannot work under pressure. 

   

  We hade in fact this Sunday a real test scenario, waiting on an airport for the clearance and the clear to take off, the oil temp started to go up, and there we go!!, we closed the flap and turn the fan on and the oil temp started to go down. So we had in group oil cooling!!! Now the question remains, will in the winter generate enough recirculation heat to heat the cabin in on the ground and in flight?   Our unorthodox tests of last winter say yes, but it is not until now we permanently mounted the solution, so when the cold weather comes back in few months I will report to the group the results, but it looks very promising. 

   

  Ruben

   


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  From: Don Johnston [mailto:numa at comcast.net] 
  Sent: Sunday, June 23, 2013 8:24 PM
  To: Velocity Aircraft Owners and Builders list
  Subject: Re: REFLECTOR: Need for Cabin Heat at Altitude

   

  I don't know if it's going to work (since I'm not flying yet), but I've created a controllable door that will block off the outside air from the nose oil cooler which will allow inside cabin air to be passed through the oil cooler via a blower. Effectively heating cabin air instead of outside air. 

  http://www.velocity-xl.com/blog/2008/06/14/12-3-6-nose-oil-cooler/

  http://www.velocity-xl.com/blog/2013/05/03/12-3-6-nose-oil-cooler-control/

  -Don

  On Sun, Jun 23, 2013 at 7:15 PM, victor delta <vdelta at pacbell.net> wrote:

  Looking for experiences, solutions, implementations,  ideas and otherwise  for requirement to assure reasonable cabin temperature/heat for passengers when flying in lower to mid flight levels ongoing.
  Especially welcome comments from those that fly their aircraft high most of the time, at night and/or during winter months.
  Thanks in advance for all contributions.
  VD

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