Funky Steel Frame Designs

Quite like this ice bike from Sweden
 

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This kind of groovy
 

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Bottechia Kronotech Concept

fully-faired frame for maximum streamlining
continuously variable transmission
estimated price: $20,000
down-tube shift lever
integral computer
never produced
 

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Interesting "ice" adaptation. Probably not too much fun in cross winds. We took old tires and screwed sheet metal screws through from the inside; worked okay except cornering.
 
That's a very nice frame did you import it?
I have a couple of those Nishiki bikes. They were marketed in the US so available "locally" in the western US (originally American Eagle, then Nishiki; by West Coast Bikes). That frame '86 ('87 model year) made by Kawamura.

I do have a Hopmans lo-pro (nos frame not built yet) stored away so I'll see if I can find photo of it to represent.
 
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Early '90s Hopmans "Granchio" frame (seller photo; but my frame).

DSC_0037_4e032d10-6d73-43dc-ba90-4e9a28e7b542_grande.webp

Note: I personally never understood the reason for a curved top tune. All it does in my opinion is to add weight as I see no aerodynamic or structural value that improves the frame's inherent performance/efficiency.

Can someone with framebuilding knowledge enlighten me as to the benefits other than aesthetics (especially on a track frame)?
 
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