Flying in the Karoo

[Duck Rogers]

Forget carb icing.
The Bing carbs are not so prone to icing due to their construction and manner of operation. There's no conventional venturi as in a downdraught carb

[Morph]

Duck,

I would like to debate this

The 503 and 582 use the throttle cable to pull the carb open. if there is a little ice buildup, increasing the throttle usually breaks it free, you feel the motor running rough for a sec as it digests the ice and then it settles down. The 912 works the otherway. A spring holds the throttle open and you use the throttle cable to close it. If it is a little iced you do not have the ability to force it open.

[Duck Rogers]

I should be more careful

I'm assuming 503/582 and not 912. (I keep forgetting about them 4 strokes
I'm also assuming pre-mix 'cos that's what I do. In my opinion, pre-mix helps a little bit in prevention against ice build-up.

The 503 and 582 use the throttle cable to pull the carb open. if there is a little ice buildup, increasing the throttle usually breaks it free, you feel the motor running rough for a sec as it digests the ice and then it settles down.

My sentiments exactly. Not easy to get into too much k@k BUT NOT ENTIRELY impossible to get carb ice on a 503/582 but not very likely in the Karoo. (That's what the topic was about, after all

Nothing much to debate.............

[Morph]

[grostek]

Systems that prevent carb icing are like insurance, you can pay insurance for 20 years and not make a claim BUT when you do make a claim its nice to know it will pay out.

The same with a carb ice preventive system, it may not be needed for several years but when you do need it its nice to know you have one fitted.

So do not rely on "Karoo humidity is Low" that is like not having any paid up insurance.

Surely when we fly we want our systems and Aircraft to be safe at all times even when there is suddenly carb ice due to high humidity, then it would be real nice to have a carb heat system that can deliver hot air to the carb for just those instances.

Duck Rogers is right in that 4 strokes are the main culprits of carb icing but not the only ones, 2 strokes can also ice up as several have experienced and indicated on this thread.

Just my opinion.

Kind regards,

Gunter Rostek.

[Arnulf]

Systems that prevent carb icing are like insurance, you can pay insurance for 20 years and not make a claim BUT when you do make a claim its nice to know it will pay out.

The same with a carb ice preventive system, it may not be needed for several years but when you do need it its nice to know you have one fitted.

So do not rely on "Karoo humidity is Low" that is like not having any paid up insurance.

Surely when we fly we want our systems and Aircraft to be safe at all times even when there is suddenly carb ice due to high humidity, then it would be real nice to have a carb heat system that can deliver hot air to the carb for just those instances.
Duck Rogers is right in that 4 strokes are the main culprits of carb icing but not the only ones, 2 strokes can also ice up as several have experienced and indicated on this thread.

Just my opinion.

Kind regards,

Gunter Rostek.

The carbs on my 912 are fitted with a small water mantel, that is connected to the water circuit. Permanent carbheat without the power loss associated to a hot air system. Works well.

Regards,
Arnulf

[Morph]

The carbs on my 912 are fitted with a small water mantel, that is connected to the water circuit. Permanent carbheat without the power loss associated to a hot air system. Works well.

Does it stay hot all the time. I assumed there was a water valve that enable the water. Mind you it's not heating the air, thus no reduction in performance. Clever. How much?

[Arnulf]

The carbs on my 912 are fitted with a small water mantel, that is connected to the water circuit. Permanent carbheat without the power loss associated to a hot air system. Works well.

Does it stay hot all the time. I assumed there was a water valve that enable the water. Mind you it's not heating the air, thus no reduction in performance. Clever. How much?

Don't know how much. Was fitted when I bought the trike. Was under the impression that it was standard on all new 912 motors.

Regards,
Arnulf