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Rotax 912 Cooling issue / Zodiac CH 601 HDS

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Gilles.Thesee(at)ac-greno
Guest

Posted: Fri Jun 22, 2007 3:08 am Post subject: Rotax 912 Cooling issue / Zodiac CH 601 HDS

JetPilot a écrit :

 	  Quote: 	
		  

 CHT's running 100 degrees F ????   That does not make any sense at all.  That is very close to the reading you would get with a completely cold engine.   Something wrong in your readings, or in your reporting of temperatures.  A CHT 100 degrees for a running engine is impossible.

   


	


Isn't there a confusion with Celsius ? The Rotax is a Eurapean engine. 

100 degrees Celsius is quite normal for CHT in a cruise, whereas 150°C 

is the absolute redline.

By the way, the Rotax 91X are easy to cool once you do your air inlet 

and diffuser homework.



Regards,

-- 

Gilles Thesee

http://contrails.free.fr

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Fri Jun 22, 2007 6:53 am Post subject: Re: Rotax 912 Cooling issue / Zodiac CH 601 HDS

Hi Giles,



Your right about the temps if he said they were Celcius, but he said they were F.  Most of us here in the US run our gages in F, but you have the option of using C on a lot of gage sets.



Here is an easy, do it in your head, formula for converting C to F.



Take C and double it,

then minus 10% from that doubled number,

then add 32 to that number and you have F.



Example:

20 degrees C x 2 = 40

now minus 10% which is 4 which equals 36,

now add 36 + 32 = 68F



Example:

30c x 2 = 60,

minus 10%  (60-6=56),

56 + 32 = 86F



Do it in your head easy. Now when they tell you on the radio it is 35c for an OAT, you will know it's??????

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

Gilles.Thesee(at)ac-greno
Guest

Posted: Mon Jun 25, 2007 2:30 am Post subject: Rotax 912 Cooling issue / Zodiac CH 601 HDS

 	  Quote: 	
		   Hi Giles,



 Your right about the temps if he said they were Celcius, but he said they were F.  Most of us here in the US run our gages in F, but you have the option of using C on a lot of gage sets.



 Here is an easy, do it in your head, formula for converting C to F.

   


	


Roger,



Thank you for your message.

Yes the temps in question were said to be F, but as they did not seem to 

make sense, the possibility of a unit confusion came to my mind.



Re the tip on conversion, as European flyers, we are used to convert 

when dealing with engines from across the pond (though we usuallly do 

convert from F to C).

Funnily, in P51 field manuals, the engine temps were in Celsius during WWII.



Best regards,

-- 

Gilles

http://contrails.free.fr

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