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HeliTorque :: View topic - Can I start the ball rolling?
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HeliTorque Forum Index » Flight Dynamics

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Can I start the ball rolling?
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Thomas Coupling
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PostPosted: Tue Jul 27, 2004 3:31 pm    Post subject: Can I start the ball rolling? Reply with quote

Okay then....

On the R22 beta, the carb ice gauge differs from that on the straight R22, even though the engine and carb is the same on both machines.

Why?
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PostPosted: Tue Jul 27, 2004 3:44 pm    Post subject: Carb Heat Reply with quote

Hmm, could it be something to do with the fact that the Beta R22s are fuel injected and have carb heat assist? I haven't flown a Beta yet but I remember reading something about it in the POH. Confused

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Last edited by WhirlyGirl on Tue Jul 27, 2004 4:45 pm; edited 1 time in total
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PostPosted: Tue Jul 27, 2004 4:03 pm    Post subject: Reply with quote

Nope!

Have a good think about the fuel injected bit. Way off course!
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PostPosted: Tue Jul 27, 2004 4:47 pm    Post subject: Baffled... Reply with quote

Okay, now you've got me. I'll chew it over for a while...

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PostPosted: Tue Jul 27, 2004 5:15 pm    Post subject: Trial answer.... Reply with quote

I think it has something to do with comparing the use of carb heat with changes in collective setting to reduce pilot workload?

Could be wrong though!


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Thomas Coupling
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PostPosted: Tue Jul 27, 2004 5:30 pm    Post subject: Reply with quote

You certainly are wrong Mr Whirley Wink

Why do the carb heat guages read differently?

Hint:

Something to do with the manufacturer getting it wrong!
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PostPosted: Thu Jul 29, 2004 4:55 pm    Post subject: A wild guess... Reply with quote

Right,

Might it be something to do with the fact that the carb heat sensors are in different positions in the carburetor on the Standard and on the Beta R22? Not sure which way round it is though...

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PostPosted: Fri Jul 30, 2004 7:35 am    Post subject: Reply with quote

Ah ha!

Got it! Well reserched. Often comes up as a question in the PPL tech exam.
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PostPosted: Fri Jul 30, 2004 7:39 am    Post subject: Correct Answer Reply with quote

Would you care to elaborate? Where is it positioned in each machine?

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PostPosted: Sat Jul 31, 2004 2:47 pm    Post subject: Reply with quote

Cool

The carb ice "probe" is located in the venturi area. It's supposed to be at the optimum location to give the pilot due warning of carb ice. (normally the smallest or narrowest area)

However, in the early R22's, Robinson put the probe in the wrong place, too far back from the venturi to detect ice build up!

Ask Simon to show you the venturi and explain in more detail. Far better with a hands on explanation.
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PostPosted: Wed Aug 04, 2004 6:18 am    Post subject: Carb Ice Reply with quote

Right, so does that mean you have to be more alert to the possibility of carb icing when flying a standard R22, or would some machines have been "upgraded" to put the probe further forward?

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