Cessna 182 Cowl Flaps

Cessna 182 Cowl Flaps

Hello, I am fresh 182 owner with some questions, any help would be greatly appreciated...

1. what is the proper Cowl Flap Procedure in winter, say -10 -20C or colder? I have been leaving the cowl flaps closed trying build CHT but am not sure if that is right or not. I can't seem to build any CHT regardless of flaps open or closed for take off. The needle is always right near the very bottom of the green.
2. what is the proper procedure for takeoff re: throttle/prop, I have been doing the following and have been told 2 different ways. I have been going full throttle, then at 500' AGL pulling throttle back to the top of green (24"), then bringing the prop down to 2400-2500 rpm. Should one adjust the throttle or prop first, and does it matter?, and should one be doing that at 500' or can one hold off till 1000'? or does it matter.

Thanks

newbie

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Re: Cessna 182 Cowl Flaps

I fly a 182RG, so the numbers are somewhat different as it has a Lycoming O-540 instead of the Continental O-470.  I did log several hours in a 1968 182.  As I recall, takeoff is at full throttle and prop and then back to 23" and 2450 RPM.  Reducing power, the throttle always preceeded the prop so you wouldn't overstress the engine. Adding power, the prop always preceeded the throttle for the same reason.  I was also taught to not make any power changes on takeoff until I had achieved an altitude that would allow for a safe return to the runway or an off-airport landing spot.  The thinking here was that if an engine is going to fail, it will more likely happen when you make the power change.  I don't know if there are any hard facts to back that up, but it made sense to me so I try to follow it.

As far as the cowl flaps, in the 182RG they seem to affect oil tempurature as well as CHT.  The oil temp on my plane seems to be more sensitive then the CHT and will build rapidly on climbout if I forget to open them.  Once it hits the red I can only bring it back down by leveling the plane with open cowl flaps and reduced power.  However, on climbout with full power and open cowl flaps the oil temp stays around 1/2 to 2/3 portion of the green.  It seems in cruise with flaps open or closed the CHT stays in about the same 1/2 to 2/3 range, regardless of the outside temperature.  I try to remember to close them for descent and landing to avoid shock cooling the engine, but even then I don't see a big difference in temperature if I leave them open.  I have to qualify this by saying I am in So. Cal., and we don't get severe cold weather.  Can get 100 plus in the summer though.

Hope this helps.

Jon Plaxton

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Re: Cessna 182 Cowl Flaps

If your not getting any CHT temp, you will want to have the system checked over, to ensure the indication system is functioning.  If your getting some rise in temp, but not enough....check the baffle seals, as it sounds like there is too much air flowing thru there, causing a cool engine.

Tom
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