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Carb Heat.....yes or no. Yak

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HawkerPilot2015

Joined: 10 Jan 2006
Posts: 503

Posted: Wed Apr 23, 2008 7:18 pm Post subject: Carb Heat.....yes or no. Yak

I am curious what everyones opinions is on the use/need of carb heat. My airplane has the gear but honestly it has never worked. I have never had an issue and I live in the midwest where we do have some humidity. It is there for a reason....so is it worthwhile to figure what the hell is wrong with it. I probably will but want to make sure I am not chasing my tail.



I hope everyone is well!



T

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brian-1927(at)lloyd.com
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Posted: Wed Apr 23, 2008 8:35 pm Post subject: Carb Heat.....yes or no. Yak

On Apr 23, 2008, at 8:18 PM, Tim Gagnon wrote:



 	  Quote: 	
		   



 I am curious what everyones opinions is on the use/need of carb  

 heat. My airplane has the gear but honestly it has never worked. I  

 have never had an issue and I live in the midwest where we do have  

 some humidity. It is there for a reason....so is it worthwhile to  

 figure what the hell is wrong with it. I probably will but want to  

 make sure I am not chasing my tail.


	


The single-point fuel injection system used in the Yaks and CJs (I  

call it that because everyone thinks carb ice when you say  

"carburetor") is not prone to icing. The fuel spray bar is downstream  

from the throttle valve and feeds fuel directly into the supercharger  

housing. The drop in temp from the vaporizing fuel takes place in the  

supercharger housing where it is more than offset by the thermal mass  

of the blower impeller and compression heating.



The real reason for having "carb heat" is to provide a source of  

alternate air.



--

Brian Lloyd                         3191 Western Drive

brian HYPHEN 1927 AT lloyd DOT com    Cameron Park, CA 95682

+1.916.367.2131 (voice)             +1.270.912.0788 (fax)



I fly because it releases my mind from the tyranny of petty things . . .

— Antoine de Saint-Exupéry



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napeone

Joined: 10 Jan 2006
Posts: 36
Location: Birmingham, Al.

Posted: Thu Apr 24, 2008 5:48 am Post subject: Re: Carb Heat.....yes or no. Yak

The carburetor has an operating spec of +10C to +40C. The manual calls for carb heat at anything below that range. This is not for carb ice. It is to insure that the carb itself is operating properly. The clock in the aircraft also has a temp range to insure proper operation. The clock is heated when the pitot heat is turned on.

By the way I have had two instances of carb icing. Quickly cured by applying carb heat. This on my Yak50.

David H.

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mark.bitterlich(at)navy.m
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Posted: Thu Apr 24, 2008 2:32 pm Post subject: Carb Heat.....yes or no. Yak

David, I'd be interested in the exact meteorological conditions you were

in where you had "carb icing".   Could you go into complete detail on

how it started, what it sounded like, indications,etc, followed by how

long it lasted, and how it went away when it did?  Also where was the

carb temp gage when it happened? 



The reason I ask is many fold.  



1.  I own a YAK-50 as well and have never experienced any kind of icing,

summer or winter in over 9 years now.  

2.  Some Russian aircraft flying our engines do not even have carb heat

systems.  

3.  The carburetor on the M-14 is more fuel injector than it is carb.

Meaning, it does not have a fuel bowl per se, that has fuel sucked in

from a pressure differential caused by the typical venturi.  Thus,

without the venturi it also does not have the same icing issues with a

carb that does employ the venturi technique.  



Supercooled moisture is a different animal.... 



In any case, I am very interested in hearing of your personal

experiences!  



Mark Bitterlich

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napeone

Joined: 10 Jan 2006
Posts: 36
Location: Birmingham, Al.

Posted: Thu Apr 24, 2008 5:59 pm Post subject: Re: Carb Heat.....yes or no. Yak

Mark

The exact meteorological conditions were outside airtemp 50F, high humidity.  Also included was a prolonged low  power descent. Application of carb heat cured the problem.

Thank you for your explanation of the workings of a pressure carb. 

David H.

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mark.bitterlich(at)navy.m
Guest

Posted: Tue Apr 29, 2008 4:34 pm Post subject: Carb Heat.....yes or no. Yak

David, I am far from an expert in this matter, as exhibited by the fact

that I can not understand what happened in your particular case.  Thanks

for sending me the information.  



Mark Bitterlich

 



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