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  #1  
Old 08-13-2019, 06:28 PM
BMW_X6M BMW_X6M is offline
 
Join Date: May 2012
Location: Los Angeles Coast
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Default Volume of rain an O-320 RV can fly through?

On one of my flights back from OSH I flew through a brief light shower.

What is the volume of rain when you would get concerned?
Should I close the carb heat flapper valve?
I assume at some point water will go through the engine?

Overall I remain hesitant to fly through anything but a light shower when absolutely necessary and with ADSB showing the local severity on the screen.
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Last edited by BMW_X6M : 08-14-2019 at 12:17 PM. Reason: spelling
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  #2  
Old 08-13-2019, 06:31 PM
lr172 lr172 is online now
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Quote:
Originally Posted by BMW_X6M View Post
On one of my flights back from OSH I flew threw a brief light shower.

What is the volume of rain when you would get concerned?
Should I close the carb heat flapper valve?
I assume at some point water will go through the engine?

Overall I remain hesitant to fly through anything but a light shower when absolutely necessary and with ADSB showing the local severity on the screen.
I have flown through some relatively heavy rain in my 6 / IO-320 (IMC). Don't see how any meaningfull amount of water can get through the filter. Light amounts that can vaporize are almost beneficial and do no damage. Water injection has been used for decades to help reduce detonation potential, typically to allow greater ignition advance increased turbo boost or higher compression. I don't see how the carb heat flapper would help. More important to be sure that your FAB has a drain hole for the water to escape. Without this, I could see a real problem with water ingestion.

Larry
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Last edited by lr172 : 08-13-2019 at 06:37 PM.
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  #3  
Old 08-13-2019, 07:09 PM
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Vlad Vlad is offline
 
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Location: NJ
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Quote:
Originally Posted by BMW_X6M View Post
On one of my flights back from OSH I flew threw a brief light shower.

What is the volume of rain when you would get concerned?
Should I close the carb heat flapper valve?
I assume at some point water will go through the engine?

Overall I remain hesitant to fly through anything but a light shower when absolutely necessary and with ADSB showing the local severity on the screen.

Once upon a time I flew in moderate to heavy rain for over an hour. The engine performed fine I am sure it ingested some water. I have a tipup canopy and my cockpit was flooded with carpet soaking wet. I had drainage holes in the floor but they were not large enough to relieve the water. I throttled down to lessen wood prop erosion but leading edges were beat up. I fly through the rain relatively often and engine performs the same. Flawless.
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  #4  
Old 08-13-2019, 07:14 PM
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Steve Melton Steve Melton is offline
 
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Location: Cincinnati, OH
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I've had some rain where the engine developed a slight non-uniform miss, I pulled the carb heat closed and it cleared. Pulling the carb heat in heavy rain may be beneficial. I have limited testing for heavy rain.

but this tape helps keep water out. doesn't need to be this wide in the aircraft axial direction. extends slightly beyond the hinges.

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Last edited by Steve Melton : 08-13-2019 at 07:26 PM.
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  #5  
Old 08-13-2019, 07:34 PM
ALagonia ALagonia is offline
 
Join Date: Jul 2017
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Flying back from Minnesota a week after OSH I flew for over an hour in rain that was a bit more than moderate at times. Engine performed flawlessly. I have a slider canopy and did not get one drop of water in the cockpit. My Catto three blade also came out unscathed, no damage to the paint.
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  #6  
Old 08-13-2019, 09:10 PM
mbauer mbauer is offline
 
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Location: Nikiski, AK
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Default Heavy Rain = Low Visability

The biggest limiting factor for heavy rain has been visibility for me. IFR Cherokee 140 flight. Looked like a wall of water underneath a very dark/black cloud.

I always apply carb heat and reduce RPM. Asked Craig at Catto about rain, he said to reduce below 2200 rpm.

Picked-up/purchased my RV-6 at Jackson, CA; homebase for Catto. He taped my leading edges before I departed for home. Have an early RV-6 Catto two blade without the metal leading edges.

Best regards,
Mike Bauer
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  #7  
Old 08-13-2019, 09:42 PM
scsmith scsmith is offline
 
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Location: Ashland, OR
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I have a ram-air inlet, similar to a Bower inlet, with alternate air going through a conical K&N filter. Unlike the Bower inlet, my alternate air source is taken off of the #2 cylinder cooling ramp.

I have been in thunderstorm rain so heavy that it became hard to maintain a horizon (although still pretty clear which way was up from the dark cloud base). I have on occasion selected alternate air, closing off the direct ram air. But I have never noticed any adverse effect on engine running, even with the ram air on, which must gulp a fair bit of water.
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  #8  
Old 08-13-2019, 10:36 PM
lr172 lr172 is online now
 
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Quote:
Originally Posted by mbauer View Post
The biggest limiting factor for heavy rain has been visibility for me. IFR Cherokee 140 flight. Looked like a wall of water underneath a very dark/black cloud.

I always apply carb heat and reduce RPM. Asked Craig at Catto about rain, he said to reduce below 2200 rpm.

Picked-up/purchased my RV-6 at Jackson, CA; homebase for Catto. He taped my leading edges before I departed for home. Have an early RV-6 Catto two blade without the metal leading edges.

Best regards,
Mike Bauer
I have a catto and applied the leading edge tape. I fly at 2700 in all kinds of rain with no damage/erosion. I think his caution is for props without the tape.

Larry
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  #9  
Old 08-14-2019, 04:49 AM
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Mark Dickens Mark Dickens is offline
 
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Location: Collierville, TN (KFYE)
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I've flown twice this year in heavy rain, as long as 20 or so minutes. My setup is similar to Steve's with a forward facing scoop into a conical filter. It ran smoothly through all of it. I did get a little paint erosion on the prop tip paint and on the baffles in front of the #1 and 2 cylinders, but other than that, nothing. I didn't even get any leakage into the cockpit or forward baggage.
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  #10  
Old 08-14-2019, 07:02 AM
rocketman1988 rocketman1988 is offline
 
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"...I have been in thunderstorm rain so heavy that it became hard to maintain a horizon..."

Why?
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