REFLECTOR: Velocity heater

Rene Dugas dugasd at bellsouth.net
Tue Jan 8 12:04:49 CST 2008


Dave, just a thought that I tried and worked well was to suck air out of
one front foot well and blow it into the other since you already have
the scat tubing and with the flapper valve closed the cavity behind the
oil cooler gets quite warm although not hot.  I placed a bilge fan
blower here and recirculate with minimal added work and significant heat
if I duct tape over the oil cooler fins for winter flying.  I do not
need either oil cooler for winter flying with my IO 540.  I also have
the 12v blanket and stay quite comfortable.
Rene'

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of David Scharfenberg
Sent: Friday, January 04, 2008 3:18 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Velocity heater

Thanks to everyone that responded.

The 12 volt heated blankets are a great idea.

Since I have almost everything in place already to emulate Rich, Terry  
and Al's setup, I might try to modify what I have now.  All that I  
really need to do is to get cabin air into the oil cooler instead of  
outside air.  It would be nice to design a door that would allow air to

enter the cooler from either the cabin (via blower fan) or the outside  
(for summer flying).

Thanks for the ideas!

Dave




On Jan 4, 2008, at 2:07 PM, Terry Miles wrote:

> Dave,
> Me too.  This cabin heater is a Hangar 18 mod.  He gets the credit for

> this
> in my bird.  I was the apprentice.  I think Rich's might be one of the

> first
> ones Malcolm did.  I used a bilge fan from West Marine.  7 amps  
> maybe...I
> forget, but it fit the hose diameter, better than my first fan
(square)
> which was scrap from fancy electronics cooling setup. There are two
oil
> coolers in the engine oil system.  Main one is in the wing root with  
> wing
> scoops for entry and exit and no control of cooling air flow.  In the

> winter
> I can route to the nose first.  In the summer I reverse directions by
> swapping in/out oil ports at the engine.
>
> On the pics:  We built a front face wind-block for what you could call

> the
> upper forward wall of the cabin compartment and mounted the fan there.

>  Fan
> outlet air is pushed thru the oil/air exchanger and down to the front

> seat
> foot wells only.  Only cabin air is pushed across the oil cooler.  The

> upper
> and lower plenums for the oil cooler were shaped from spare foam.
>
> I filed a flat spot on to the full length of an AN6 bolt and riveted a

> small
> pc of HAC sheeting for a diverter.  You can see the end of the bolt  
> below
> the two outlet lines.  You can't see it in these pics, but I also  
> added a
> defrost 2nd ducting and an an in-line induction fan that sucks air out

> of
> the main plenum and up to a defrost defuser made from a floor vac
> attachment.
>
> I have no experience flying in cold air yet.  M Collier says that Rich
> Guerra says it works great for him.  Good luck with it.
> Terry
>
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
On
> Behalf Of Alex Balic
> Sent: Friday, January 04, 2008 10:01 AM
> To: 'Velocity Aircraft Owners and Builders list'
> Subject: Re: REFLECTOR: Velocity heater
>
> I have a similar installation to Rich- I used a blower from a Toyota  
> corolla
> (salvage yard $15) the advantage is that it is already set up for  
> several
> speeds (I am using only hi, low, and off) and it builds some good  
> pressure
> because it is a squirrel cage design- I have water cooling, so I do  
> not need
> the nose cooler for engine cooling, and I currently do not have an  
> outside
> dump, and I am getting the air directly from the nose section in front

> of
> the canard, but I like the idea of a supply duct running to the cabin

> like
> Rich has, so I might look to install that as well- if I am still  
> getting
> heat creeping into the cabin with the unit off, I will look to provide

> an
> external dump- if you have an air cooled installation you will  
> probably need
> to provide the dump to be able to shed heat from the oil even when you

> are
> not cold in the cabin.  Wish I had the time to build up a beautiful  
> site
> like Rich has...............
>
> Alex
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
On
> Behalf Of Jack Prock
> Sent: Thursday, January 03, 2008 10:24 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Velocity heater
>
> Dave,
>
> Rich Guerra used an oil heater configuration that pulls air from the  
> cabin
> and recirculates
> it through the nose oil heater. It also allows blowing air through the

> fan
> and oil heater and
> sending it overboard in the summer. Which should help when sitting on

> the
> ramp in the summer.
>
> I am not to that stage yet, but I plan on using the same
configuration.
> It makes sense to me that you would try and warm interior air, and not
> try and warm frigid outside air. This setup eliminates the forward
NACA
> scoop as well.
> See the following site,  http://www.rguerra.com/velocity/   then go to
> "System Works"
> and the bottom 15 or so pictures on that page, you will see his setup
> and explanation. The fan he uses costs about 25 bucks online.
>
> This is just one more example of pictures and ideas from builders who

> have
> posted online that help out those that follow. Thanks to all that take

> the
> time
> and energy to post pictures and explanations. I for one am very  
> grateful to
> those
> that have the extra energy to build and maintain their sites.
>
> Jack Prock
> 700 hours in and counting...
>
>
> ----- Original Message -----
> From: "David Scharfenberg" <dave at winco.net>
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> Sent: Thursday, January 03, 2008 5:44 PM
> Subject: REFLECTOR: Velocity heater
>
>
>> The family and I just flew back from FL to IL last night and about
>> froze to death.  I am thinking about mounting an oil cooler
somewhere,
>> and recirculating cabin air through it with a small fan.  My thought

>> is
>> that recirculated 50 degree air moving slowly through the oil cooler
>> will come out at a higher temp than -4 degree air blowing through at
>> 170 knots.  The heat just isn't adequate for OAT below 30-40,
>> especially at night.
>>
>> Has anyone else who has gone this route mind sharing their
experience?
>>
>> Thanks,
>>
>> Dave Scharfenberg
>>
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