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Erich,
Was it someone with sub experience from many different locations all over the planet?
The Oscar is in an area with wayyyy cold water, plus high and dry. It will look different than in the waterOklahoma, warmer. Also, that's not algae on the OK, but sea-grass. She's been sitting alongside the tender for some time. Evidently, their are no swans and mullet to nibble on it for a snack wherever that picture is taken. Here's a couple of pics, Jonathan Eno's Jimmy Carter-fish, and my Trepang. Trepig was painted to be after a one month upkeep at NLON, after a hull cleaning. Go with what you got. You can't be wrong (unless you go pink, or international orangy!!)
The two photos were chosen to show the different in growth depending on where the boat was tied up.
The Oklahoma is covered with algae and the bright green is indeed sea grass.
In warm water the sea grass will grow very quickly.
Just a few days and the grass can grow a few inches.
The algae can also grow quickly but it grows flat against the hull giving the dark green color.
The Russian boat in cold water will collect a slow growing algae but not the sea grass.
Here is an aerial photo of the Chicago submerged out of Hawaii or Guam.
You can see a definite sea grass line.
The point is, your representation of grow on the hull is good.
It doesn't fade out as much as I'd like but i agree the second one looks better. i'm stripping the entire hull down and starting over. i noted in some photos i took that my draft numbers aren't straight, and id like to see more streaking in the salt water effects.'
In your interesting photo, the green is sea grass and the brown would be algae.
Algae will grow on all parts in the water.
The sea grass grows from the water surface down until it no longer has enough sun light to continue.
The brown line at the waterline is the lap line. The sea grass tries to grow where the water waves lap on the hull but is not wet 100% of the time. The sea grass can not get a good hold on there so it is mostly oil and other contaminants in the water.
The lap line is also effected by the boats buoyancy. It changes as things are removed or added in the boat. Example: Bow draft on the boat in the photo is effected by number torpedoes on board or not.
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