REFLECTOR: Cold Weather Flying

[Brian Michalk]

I have variable intakes.  I am not using the stock armpit scoops, but 
made my own armpit scoops.  I will see if I can find some pictures.  
They are driven by a threaded rod and stepper motor that is just forward 
of the spar inside the strake.  At the moment they are fixed in the open 
position.  I do not have the electronics to drive the steppers 
installed.  I just put in the hardware, and will go fly like this for a 
while.  When I get the time I will install the electronics that gets a 
signal from the CHT system off the SMBUS.  They will be autonomous.

On 12/21/2012 10:04 AM, John Dibble wrote:
> Had a good flight from MS to NY on Wednesday.  Stopped at DKX 
> Knoxville for fuel.  That's a hard airport to find hidden in the 
> hills.  A while back I reported that my temps were too low in cold 
> weather and not enought cabin heat.  I decided to go after the source 
> of the heat and reduce the engine cooling air, see pic.  I thought 
> this would be over kill and I would have to trim it a bit, but it 
> turns out that this just gets the engine temps to the bottom of the 
> desired range (250-300F) with an OAT of 40 F.  At 30F CHTs are 
> 240-245F.  Still, the oil temp ran at 275F with the diverter flap 
> fully deployed and that gave too much cabin heat. During descent for 
> landing, temps got very low and I had no cabin heat.  I would like to 
> have a way to adjust engine cooling air from the cabin, so I can have 
> max cooling for T/O and reduce cooing air at cruise and reduce it 
> further for descent.  Has anyone done this?
> When the OAT got down to 30F, I decided it would be a good idea to add 
> some carb heat even though my manifold pressure was holding steady.  I 
> did not see an expected increase in the carb temp gauge, but the MP 
> did decrease by a few tenths indicating that the carb heat was 
> working.  Guess I need to work more on the the carb temp sensor 
> placement.  I had moved it to the fitting where the manifold pressure 
> line connects (carb outlet).  It seemed to be giving sensible readings 
> at higher OATs, but not at 30 F where it counts. Looking forward to 
> returning to warmer weather after the holidays.
>
> John
>
>
>
>
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