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The original plans for Evel Knievel’s Sky Cycle have gone on sale through the online sales site ebay.

$_57

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Designed by former NASA engineer Bob Truax, the Sky Cycle was the rocket-like machine that Knievel famously attempted to jump across Snale River canyon in Idaho.

Whilst it looks like a conventional rocket, the Sky Cycle was actually powered by compressed steam.

$_57 (2)

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