David Paule
Well Known Member
Since I hadn't seen any quantitative data for this, I decided to test it.
The test set-up was an empty 4 oz. can of chiles, set up on a rack in the kitchen sink so that I could have ready access to it. I’d fill the can from the faucet and start the clock when I moved the faucet away. This gave me a consistent timing set-up. I tried #40, #30, #19 , 3/16” and 1/4” holes.
Here’s the raw data:
#40 took 82 seconds
#30 took 52 seconds,
#19 took 30 seconds,
3/16” took 25 inches and
1/4” took 15 seconds.
Except for the 1/4” hole, all had at least some water remaining, generally .03 to .05 inches. The smaller holes had more variability for the time remaining, so I averaged the times. I did each at least twice.
Here’s a chart, with seconds on the vertical axis and hole diameter on the horizontal axis.
I'll probably use 3/16" or something between that and 1/4".
Worth noting is that my 1955 Cessna 180 has some nice snap-in fairings for its 1/4" drain holes. But they don't seem to be in the parts manual and I don't have a part number. They are roughly similar to the "seaplane" grommets AN231-4 used for fabric airplanes, but metal and they pop into the holes. With a decent glue, I'd imagine that the seaplane grommets would work but I didn't test any holes with them.
Dave
The test set-up was an empty 4 oz. can of chiles, set up on a rack in the kitchen sink so that I could have ready access to it. I’d fill the can from the faucet and start the clock when I moved the faucet away. This gave me a consistent timing set-up. I tried #40, #30, #19 , 3/16” and 1/4” holes.
Here’s the raw data:
#40 took 82 seconds
#30 took 52 seconds,
#19 took 30 seconds,
3/16” took 25 inches and
1/4” took 15 seconds.
Except for the 1/4” hole, all had at least some water remaining, generally .03 to .05 inches. The smaller holes had more variability for the time remaining, so I averaged the times. I did each at least twice.
Here’s a chart, with seconds on the vertical axis and hole diameter on the horizontal axis.
I'll probably use 3/16" or something between that and 1/4".
Worth noting is that my 1955 Cessna 180 has some nice snap-in fairings for its 1/4" drain holes. But they don't seem to be in the parts manual and I don't have a part number. They are roughly similar to the "seaplane" grommets AN231-4 used for fabric airplanes, but metal and they pop into the holes. With a decent glue, I'd imagine that the seaplane grommets would work but I didn't test any holes with them.
Dave
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