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  #11  
Old 11-02-2014, 02:16 PM
f1rocket's Avatar
f1rocket f1rocket is offline
 
Join Date: Jan 2005
Location: Martinsville, IN
Posts: 2,342
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Yep, I kind of opened myself up for that one. What I should have articulated better is more of a local condition specific for our field. If you get too slow in final, the swirling winds off the ridge line can cause your airspeed to drop very quickly so we tend to not get too slow on final to account for this. Once over the ridge, you can slip it but that builds up speed pretty quickly and the ridge is close to the end of the runway too.

I'm really not a bad pilot. Really.
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  #12  
Old 11-02-2014, 04:53 PM
sandpiper sandpiper is offline
 
Join Date: Nov 2009
Location: Independence, OR
Posts: 317
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Isn't the point of a slip to increase decent without gaining airspeed?
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  #13  
Old 08-24-2021, 07:18 PM
edmondthx1138 edmondthx1138 is offline
 
Join Date: Jun 2021
Location: Tucson
Posts: 4
Default RV-12iS Idle RPM Fluctuation

I recently noticed my RV-12iS (about 40 hrs TT) exhibit RPM fluctuations with engine at idle (app. 2,000 RPM)

This happens during descent with throttle at idle or taxiing back to the hangar after the flight.

The RPMs will fluctuate in a consistent and regular cycle from 1,900 to 2,100. It will climb to 2,100, drop to 1,900 and then continually repeat.

Is this normal?
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  #14  
Old 08-25-2021, 05:44 AM
Amadeus Amadeus is offline
 
Join Date: Nov 2020
Location: Basalt, CO/Lexington, KY
Posts: 78
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Quote:
Originally Posted by edmondthx1138 View Post
I recently noticed my RV-12iS (about 40 hrs TT) exhibit RPM fluctuations with engine at idle (app. 2,000 RPM)

This happens during descent with throttle at idle or taxiing back to the hangar after the flight.

The RPMs will fluctuate in a consistent and regular cycle from 1,900 to 2,100. It will climb to 2,100, drop to 1,900 and then continually repeat.

Is this normal?
Not normal. That sounds something like an intake manifold leak.
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  #15  
Old 08-25-2021, 07:02 AM
bobg56 bobg56 is offline
 
Join Date: Nov 2018
Location: Peachtree City, GA
Posts: 195
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Flight idle will be higher than ground idle due to having forward speed so if your ground idle lowest rpm is 1650 your going to see 1900-2000, if not a little more flying the pattern with throttle at idle. I like to pull throttle when abeam the numbers and see if I can land without touching the throttle, good practice for engine out.
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