> preheating your [gasoline] engine if it's 20 degrees out; if you're 
 > willing to do that now, your aircraft Diesel will certainly have no 
 > problems starting.
 > 
 > There seems to be 2 or 3 serious efforts to get a modern Diesel 
 > aircraft engine flying. Hopefully, at least one will make the grade.
The Germans used diesels in aircraft long ago.  The Zeppelins used at least 2 
large diesels.  I saw a documentary about them and they showed the engineer 
walking around them while they were in flight.  It was a real strange sight 
to see.  They were also proud of how little noise could be heard from them 
within
the passenger areas.
As far as cold goes, the main concern in an aircraft diesel would be the fuel 
getting too cold and thickening.  Once the engine is heated up and running, 
there should be no other problems.
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