[PSUBS-MAILIST] Acrylic & distortion

[Joe Perkel]

Alan,

I don't have that text yet, every time I think to buy one I get a weeks worth of groceries instead! :)

 Joe

On Jan 13, 2014, at 7:53 PM, Alan <alanlindsayjames at yahoo.com> wrote:

> Joe,
> if you look in the Stachiw book on acrylic you'll see that light is distorted
> as it moves through acrylic, & the longer it travels through it the more distortion.
> So looking straight through a thin section, not so bad, but looking through 
> the curves formed in an object made of acrylic would give more distortion.
> The impact resistance would be a problem for a ballast tank. When 
> forming a rounded shape from acrylic there is a thinning at the apex. 
> For a blown hemisphere dome the thickness at the apex is about a 3rd of the 
> original sheet thickness. So you would have to start with a relatively thick sheet.
> You would have to connect it to the hull, & this would be a problem as these
> connections would be stress points that could produce cracking.
> Hope that's thrown cold water on the idea. (sorry can't find smiley button on ipad)
> Alan
> 
> Sent from my iPad
> 
> On 14/01/2014, at 1:05 pm, hank pronk <hanker_20032000 at yahoo.ca> wrote:
> 
>> Joe,
>> If the acrylic is wet on both sides it disappears. 
>> Hank
>> 
>> 
>> On Monday, January 13, 2014 4:52:33 PM, Joe Perkel <josephperkel at yahoo.com> wrote:
>> What can I get away with as far as transparent see thru panels and not horribly distort the visual field?
>> 
>> For example, large transparent panels that double as MBT shell. Any rules of thumb, curvature direction, compound curves vs developable surfaces, etc?
>> 
>> Joe
>> 
>> Sent from Yahoo Mail for iPad
>> 
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