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Re: [PSUBS-MAILIST] ACRYLIC DOME SIZE

Bow mounted arc segment ports give a general impression of going uphill all the time, but you get used to it and compensate. If your eyes are more or less at the radius center point to the dome, then you look through the arc of plexiglas at 90 degrees-ish, and there is virtually zero distortion. Looking sideways across the dome where you are focusing at an angle THROUGH the curve is the most extreme distortion. But again, you get to where you don't think about it at all. In other words, weird becomes commonplace. Don't tell me this surprises you guys. We do weird for fun, don't we?
Vance


-----Original Message-----
From: ALAN JAMES <alanjames@xtra.co.nz>
To: personal_submersibles@psubs.org
Sent: Sun, 11 Jan 2009 11:57 am
Subject: Re: [PSUBS-MAILIST] ACRYLIC DOME SIZE

Thanks Frank & Jon, am proceeding with caution.
Alan
 
----- Original Message -----
From: ShellyDalg@aol.com
To: personal_submersibles@psubs.org
Sent: Friday, January 09, 2009 6:26 PM
Subject: Re: [PSUBS-MAILIST] ACRYLIC DOME SIZE

Hi Alan. A lot depends on how much ARC the dome has, and where "in-it" your head is. I don't have a dome on my sub but I've heard the view gets pretty distorted as the curve/arc gets tighter. My experience is with the dome window in the tank at Monterey Bay Aquarium. It's about 42 inches I think and is a 1/2 sphere. At that much arc, it's very hard to determine what's ahead and what's beside you. It's a trick your mind plays but when you get your head into the middle of the dome, It's no where near what's really there. Because it's a seamless view, your mind just takes it in as a picture ( the dome's not moving like it will in a sub) but when you step aside and look at the same place in the tank through a flat window......BIG difference.
Jim K has a nice big 39 inch dome but the curvature isn't that great, so I'd guess the distortion won't be too bad. Lots of guys have dome's on top of their K boats and will have better advice. Frank D.