nuckolls.bob(at)aeroelect
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 Posted: Wed Jan 04, 2017 6:29 pm Post subject: EMI From Seat Heaters and Other Questions |
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I suspect that twins had Janitrol heaters long before heated seats were invented, or even a possibility (many generators from that era could barely keep up with the electrical demands of the instrument panel). And the current crop of cabin twins have them because those that can afford them expect them to offer all the comforts of home; hang the expense and inefficiency. |
Janitrol and Southwind . . . both legacy icons
in cabin comfort in the air and especially on the
ground.
I picked up an old Southwind heater at a garage sale
some years back and was fascinated by the technology.
MUCH simpler than the gas fired heater in my VW van.
Dug up the patents on a few models . . . very slick.
Used engine vacuum to 'suck' fuel, provide 'draft'
and dispose of exhaust gasses. Glo plug for ignition.
Really slick. Combustion fuel/air pathway totally
closed. These were popular before my time but relatives
spoke highly of them. McCollum's name appears on dozens
of Southwind patents of that era . . . he was a
prolific inventor/developer.
My mentor (Ken Razak) and I puzzled over the practicality
of adapting a similar technology to compact cabin heaters
for the Ez series aircraft . . . using a venturi to produce
operating vacuum. It appeared doable but not without a
great deal of R&D . . . and the market was limited.
All light twins use gas heaters 'cause you just can't
get exhaust-muff heated air in from the wings. Further
if the airplane is pressurized, the cabin air side
of a gas heater lends itself to becoming part of the
pressure vessel.
Persons interested in reviewing this piece of automotive
history are welcome to download the data package at:
http://tinyurl.com/jy6potv
Bob . . . 
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