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#4001811 - 08/28/14 05:23 AM FW190 armoured glass refraction proof video  
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JG301_HaJa Offline
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Hi mates,
can't find this posted here and it's so bloody good I will post it.
This German fella (Nemesis) has produced a great video of empirical evidence that the
bar shouldn't be there as we have said for a decade smile

As an engineer working with underwater systems and thick pressure proof windows this is
a great educational piece of work. Enjoy and draw your own conclusions.

Original thread: http://forum.il2sturmovik.com/topic/9967...shed-and-ready/


Last edited by JG301_HaJa; 08/28/14 05:32 AM.

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#4001932 - 08/28/14 03:41 PM Re: FW190 armoured glass refraction proof video [Re: JG301_HaJa]  
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letterboy1 Offline
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Very interesting!


The issue is not p*ssy. The issue is monkey.
#4002043 - 08/28/14 07:35 PM Re: FW190 armoured glass refraction proof video [Re: JG301_HaJa]  
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bisher Offline
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Cool

#4002084 - 08/28/14 09:03 PM Re: FW190 armoured glass refraction proof video [Re: JG301_HaJa]  
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Peally Offline
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Interesting but my lord over in the IL-2 forums little things like these are an absolute obsession with a few folks...


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#4002153 - 08/28/14 11:41 PM Re: FW190 armoured glass refraction proof video [Re: JG301_HaJa]  
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Chivas Offline
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Wow, that was interesting. I've flown the 190 extensively in IL-2 and never found the bar to be that much of a problem, but deflection shooting would have been much easier if the windshield had been modeled properly.


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#4002210 - 08/29/14 01:51 AM Re: FW190 armoured glass refraction proof video [Re: JG301_HaJa]  
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He says the glass plate he's using is about 1.5 times thicker than the actual glass used in the FW190. I wonder how much the refraction effect is increased with the thickness of the glass.


S = k ln W
#4002224 - 08/29/14 02:32 AM Re: FW190 armoured glass refraction proof video [Re: JG301_HaJa]  
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And people wonder why flight sims are such a damned impossible thing to produce, sell and make a profit at the same time. darkcloud


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#4002283 - 08/29/14 08:23 AM Re: FW190 armoured glass refraction proof video [Re: mugwump]  
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Dobby Offline
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Originally Posted By: mugwump
He says the glass plate he's using is about 1.5 times thicker than the actual glass used in the FW190. I wonder how much the refraction effect is increased with the thickness of the glass.


The thickness shouldn't matter, if I recall my physics lessons correctly. The refraction is determined by the number of media changes (ie. number of glass plates, with a tiny amount of air between), and the refraction index of the material, not the thickness of it, as it's a surface phenomenon (someone correct me if I'm wrong).

So I'm thinking he tried to use the correct number of plates, but didn't have them at the correct thickness. Shouldn't matter though. One might argue that armored glass has maybe a different refraction index than the glass he used smile


Luckily there are people here better qualified than me. I stand corrected wink

Last edited by Dobby; 08/30/14 08:21 PM.

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#4002292 - 08/29/14 09:26 AM Re: FW190 armoured glass refraction proof video [Re: JG301_HaJa]  
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imaca Offline
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The thickness of the glass is the only thing that matters (assuming angle is constant 25deg). The light leaves at the same angle it enters, the thicker the glass the greater the displacement before it is bent back to parallel to entry angle again.
Effectively it is like a periscope.
http://www.gcsescience.com/Light-Refraction-Glass.gif

Last edited by imaca; 08/29/14 09:31 AM.
#4002366 - 08/29/14 01:13 PM Re: FW190 armoured glass refraction proof video [Re: JG301_HaJa]  
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Yeah, if you look at the railing outside when he's looking out the window through it you can see it's moving everything downwards through the glass.



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#4002741 - 08/30/14 07:25 AM Re: FW190 armoured glass refraction proof video [Re: JG301_HaJa]  
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JG301_HaJa Offline
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The thickness matters but since the frame is made to correspond to the thickness of the glass
the representation of the effect is correct. The original thickness of the armoured glass were
designed to have the same effect as this mock-up. Ergo the experiment is empirically valid.


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#4002874 - 08/30/14 03:59 PM Re: FW190 armoured glass refraction proof video [Re: JG301_HaJa]  
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Gambit21 Offline
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Exactly


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