REFLECTOR: NACA Air Intake and rain/water?

[Scott Derrick]

I don't feed my servo off the top naca's, but from a lower mounted ram 
air scoop. I do have a drain hole in the scoop before and after the 
filter, both at a low spot that would tend to collect fluid. I actually 
put the inside drain in after over priming caused fuel to pool in the 
scoop and a backfire caused it to catch on fire!  I put the outside 
drain in after washing the plane and noticing a pool of water before the 
filter.

You should have some kind of drain in your intake if water can find its 
way from the naca's to the server while its sitting on the ramp in a 
rain.  More so you don't gulp a big slug of water when trying to start 
it. Of course if its all down hill from the naca's to your intake tubes 
you definitely want to divert the water from sitting out in the rain!

I wouldn't worry about flight ingested water from rain or snow. It would 
only do you engine good!  I've heard of jets ingesting to much water but 
I've never heard of that happening to a piston engine, probably could 
but it would have to be in a hurricane to get that much water!

Scott

-------- Original Message --------
Subject: REFLECTOR:  NACA Air Intake and rain/water?
From: Kevin Baker <flykb at verizon.net>
To: reflector at tvbf.org
Date: 03/10/2012 06:57 PM

> Hi All,
> I wanted to see if anyone had any issues with their Top NACA scoop air
> intake with rain or water getting in the draining down to the throttle
> body.
> I have not flown in rain but expect I'll it'll happen and was looking
> this setup and it looks like water could just run down the intake and
> into the throttle body.
> Also, if the plane was outside when it rained looked like this could
> happen also.
> I was wonder what other have done in this area or thoughts.
>
> Thanks,
> Kevin Baker
> N164PS Elite FG LW
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