Paul,
 What is the preferred design for a cabin heater using the
 rotary?  Do you
 use the oil or the water?  What about an oil to water
 cooler using an
 external water circuit?  I am building a
 pusher.  Thanks for any help.

 Joe Berki
 Limo EZ

 Perry Mick uses an oil cooler under the cockpit
 on his Long as I recall.


 Paul Lamar

 Joe,

 The highest temps are from the exhaust.  A water
 exchanger will require a
 heater core, a fan, lots of coolant hose, and a gallon or
 two of H2O. If it
 springs a leak, you could be faced with scalding hot water
 being sprayed on
 your legs/feet, and at minimum, a fogged up
 windscreen.  Bottom line... an
 exhaust heat muff provides the most heat for the least
 weight penalty.  If
 you do go that route, spring for a CO detector.

 Mark S.

 I personally would prefer a little fog to a lethal
dose of carbon monoxide.  Coolant heat exchangers have
been used since the early part of the 20th century and
failures are rare.  Failures are generally the result
of sloppy maintenance, ie not periodically changing and
flushing the cooling system and not replacing hoses.

Coolant heaters have always been a useful tool to
help dissipate  high coolant temperatures.

Joel



I believe that we should all have CO detectors in our a/c anyway.  If it
triggers, close the heater valve and open the fresh air vents... and put on
a sweater.  If the H2O heater springs a leak, you're loosing precious
coolant which will eventually cause the engine to overheat.  Run a 27# cap
and it won't take very long for all of your coolant to be sprayed all over
your cockpit.  You'll have more than a little fog.  It could even take out
your instruments if the leak is under your panel.  You'll be lucky if you
walk away with only 3rd degree burns. IMHO

Mark