REFLECTOR: Cabin Heat

Scott Derrick scott at tnstaafl.net
Sun Jan 15 16:41:56 CST 2012


I removed the internal flap from the oil cooler duct that closed off the outside air exit and redirected the air into the cabin.  I did this because it restricted the air flow to the outside to much when I wanted heat in tha cabin and it also restricted the air flow in the retracted position[cabin heat off] when I wanted maximum oil cooling.

So what I did was make a "cowl" like flap that opens and closes on the exit of the oil cooler duct. Fully open it lowers the pressure in the downstream duct and thus maximizes oil cooling.  Fully closed it restricts the air coming out to about 1/3 of normal, still allowing some oil cooling but still raising the air pressure somewhat in the exit duct and allowing the use of that for cabin heating.  

I have two flexible 1.25 inch ducts that connect to the cabin with slide valves on each one.  The pilot and copilot ducts can be individually controlled without effecting the air flow through the oil cooler exit duct.

Scott

John Dibble <aminetech at bluefrog.com> wrote:

>Scott,
>
>Are you talking about the standard flap used for cabin heat, or do you
>have a second flap installed?
>
>John
>
>Scott Derrick wrote:
>
>> The oil cooler flap is controlled from the cabin. Push-pull type
>> control.
>>
>>
>>
>> Ruben Creus <ruben at vainneg.com> wrote:
>>
>> Scott,
>>
>> Can you open and close the flap from inside the cabin or is it an
>> external flap?
>>
>> Ruben
>>
>> -----------------------------------------------------------------------
>> From: Scott Derrick [mailto:scott at tnstaafl.net]
>>
>> Sent: Friday, January 13, 2012 4:25 PM
>> To:Velocity Aircraft Owners and Builders list
>> Subject: Re: REFLECTOR: Cabin Heat
>>
>> Heating the cabin in a pusher is a sticky wicket! If you live near the
>> factory, its really not an issue. If you live up north or in the
>> mountain west, the nose oil cooler/cabin heater design is pathetic.
>> I tried covering a portion of the oil cooler and that helped heat the
>> cabin but at times I would have really high oil temps on hot
>> departures. I stopped doing that, better to be cold than hurt the
>> engine.
>> I now have an adjustable flap on the exit of the nose oil cooler,
>> helps a LOT! In the winter I usually leave this closed, which allows
>> about 1/3 of the normal amount of air though the heater not counting
>> the small amount going into the cabin. Each side pilot/copilot has a
>> control to adjust how much air they get at their feet. On hot
>> departures or in the summer the flap is full open so no oil temp
>> problems..
>> I also have an aux oil cooler/rear cabin heater under the back seat.
>> It blows a huge amount of hot air onto the rear passengers feet. It
>> can also be configured to blow air out of the cabin for additional
>> cooling, but I don't think its much help, maybe 5-10 degree reduction
>> when the oil is above 220.
>> The front cabin heater is still not good enough when the temps are
>> below 30F for the copilot. Pilot side still gets warm air. That long
>> hose over to the copilt side cools the air. I even insulated most of
>> it but it is still not good when its really cold outside.
>>
>> Scott
>>
>> -------- Original Message --------
>> Subject: REFLECTOR: Cabin Heat
>> From: Ruben Creus <ruben at vainneg.com>
>> To: reflector at tvbf.org
>> Date: 01/12/2012 07:35 PM
>>
>> Hi all,
>>
>> When I am flying below 0 Celsius outside temperature, the oil cooler
>> seems to not heat enough the air coming into the cabin. The other day
>> at -12C outside it was very chill in the cabin. I heard some of you
>> partially cover the cooler, but not sure if the can be risky if
>> covered too much. Has any one had any experience trying to get more
>> cabin heat?
>>
>> Ruben
>>
>>
>>
>>
>>
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