> Hi Paul, there was an interesting discussion on the KRS builders list
> this week. I think some of our guys would be interested in commenting on
> this latest idea. Maybe it has been done already?
>
> -dave
>
>
> From: Dave Arbogast,
> To: KRnet <krnet@mylist.net>
>
>
> Hummm, Good idea Dan -
>
> We have a firewall to protect us from the engine if things get too hot.
> It always bothered me to cut a big hole in it to route air from the
> _hottest_ item exposed in the plane.... so, we all have oil coolers, if
> as Dan says, the only change is to use longer oil cooler lines and mount
> it in an insulated air-box in the cabin, with a flipper door so it
> ALWAYS gets full outside air but dumps it into the cabin or overboard -
> or some mix, how it that more risky or complicated? The air-box is used
> on most cars for years.... Sounds simpler than the toaster to me :-)
>
> -dave
>
>
>
>> Y'all are making this too complicated. Put on a heat muff, get your
air
> supply from fresh air, and keep a CO2 warning device in the cockpit.
> Be sure to be able to shut it off and have a fresh air source that
> you can open when you need it. Simple and cheap.
>
>> From: Randy Smith
>
>> To: KRnet <krnet@mylist.net>
>> Subject: Re: KR> Heet on da feet
>>
>> The oil cooler would work if you slowed the air down
>> to pick up more heat. A heater at home only puts out
>> 120 degree air. A heat pump
>> only has 90 degrees. you will need to seal the cabin
>> up and then install an outlet for the air to travel
>> through the plane.
>>
>> --- "Dave Arbogast, CISSP" <kr2s@arb.net> wrote:
>>
>>
>>
>>> I would not quickly discount this idea. Heat as I
>>> understand it is
>>> temperature multiplied by the specific heat idea of
>>> the material. Air is
>>> many thousands of times less dense that oil so it is
>>> possible the oil
>>> could transfer more heat than the exhaust, depending
>>> upon how much oil
>>> you moved at 180 degrees and how much air you moved
>>> over the exhaust
>>> stove at 1450 degrees. With a wankel, about 1/3 the
>>> cooling comes from
>>> the oil, so it would contain a great deal of heat
>>> for the cabin. For my
>>> single rotor I'll still use coolant for my cabin
>>> heat / defroster.
>>>
>>> -dave
>
>
> Guys,
> The stock cabin heater in the Velocity kit is an engine oil cooler
mounted
> in the nose with a baffle door to control if the heat goes in the cabin
or
> to the outside. You can check out some of the builders sites to see the
> install.
> Here is one link using an electric fan with an oil cooler
> http://www.rguerra.com/velocity/systemsWork/systemsWork.html
> Larry
Larry
Interesting idea to take the heat from the oil cooler and one I also have
to
think about to get warm air to the cockpit. Thanks for the tip. I checked
out the Velocity site. I'm not sure I understand why a fan or blower is
needed though. Unlike a car at low speeds an airplane should have heaps of
of dynamic pressure in the duct to take advantage of. By building a
diversion dam (damper) to power the system then one has to concentrate on
how to control the exit of the air from the cockpit for a balanced system.
Otherwise I would think it would be easy to ruin the dynamics of the air
flow through the oil cooler. It might make some really hot air though:)
This is probably why heat muffs are placed around exhaust pipes after the
turbo. Yes monitoring CO is a must.
Doug in Japan
Doug,
Most of the Velocity's have a small naca duct for air supply on the oil
cooler cabin heater. I only found this one installation that had the fan
instead of the naca duct. If you do a search on velocity builds, there are
some great sites that show the methods used.
The Velocity's need this type of heat as the exhaust heat is a long way
from
"da feet"!
A friend of mine building a velocity in my area has the idea to use a
small
electric ceramic heater, as the cabins are build like a cooler, with a
foam
core between glass skins. Makes them very thermally efficient and a small
heater will do the trick. Of course with a rotary, you always have hot
water
available...
Larry
I suspect that in extremely cold conditions, taking outside air through an
oil cooler would yield only marginally warm air. Using air recirculation -
taking cabin air on the input to the cooler would up the efficiency
significantly..
Electric heat is incredibly heavy in terms of alternator weight. I suggest
running the numbers comparing watts of waste heat energy coming from the
engine against the mechanical energy used to drive an equivalent sized
alternator. It's probably no big deal to pull a 3000 watts of waste heat
from the engine, but pulling 3000 watts of electrical power requires quite a
large alternator.
While composite airplanes are build like ice chests, one good air leak can
cancel it all out..
Matt-
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