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HeliTorque :: View topic - Car(b) Icing?
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HeliTorque Forum Index » Flight Dynamics

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nicklappos
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PostPosted: Thu Oct 27, 2005 2:53 am    Post subject: Reply with quote

Thank you, James!

Most carb heats are precisely that, a mechanically switched supply that pulls air over the manifold, at some loss of power due to the heat/lower density.

Here is a sketch of a commercially available carb heat for kit planes:

http://www.ellison-fluid-systems.com/applications/lancair.htm
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SumKindOfMonster
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PostPosted: Thu Jun 28, 2007 1:18 pm    Post subject: Reply with quote

Could it also be something to do with the fact that we use avgas in helicopter engines and avgas seems to evaporate a lot quicker than petrol which would in turn remove latent heat more readily than petrol?
Just a thought...
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mastercylinder
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PostPosted: Fri Jun 29, 2007 8:45 am    Post subject: Reply with quote

My guess is that if you get carby icing whilst airborne you can fall to earth in really spectacular manner and die! In a car or on a motorcycle, your carby ices up, the engine stalls and you coast smoothly....to....a...stop.

Thats reason enough for me.

MC
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SuperF
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PostPosted: Wed Jul 04, 2007 10:26 am    Post subject: Reply with quote

heres my 2c.

i had a car that used to get carb icing. a 1974 Toyota Corolla, every time i drove from sealevel up towards the skifields the car would die on me within about 200 meters of a corner as you were going up the hill. just north of taihape for all you kiwis, i was heading up to ruapehu. I'm guessing carb icing as it only happened in the real cold and when it was either raining , snowing, or close to it. in those days was a uni student and had no idea about carb icing, but just clicked about it while reading this thread.

It happened a couple of times when i was chasing snow around the south island as well so confirms the winter theory??

All i had to do was sit and wait for about 15 minutes and then the car would start again. always strange when you had no idea what was going on, only happened in the winter but i got used to it, and a few of my mates had a laugh but we got to the skifield in the end.

i also had a subaru, i think it was, that you had to move a lever between summer and winter, when driving in different seasons.

another idea why few cars need them is that they normally don't climb or decend as much and as fast as aircraft so gives the car engines time to respond??? don't know if that would have an effect but sounds good to the uneducated

db
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