Must land at two meters per second or slower to avoid a crash. The default starting throttle setting is 50%. As fuel is consumed, mass decreases, making the throttle touchier. Consume all the fuel, and it will flame out. Fly too high and it will crash with a very high velocity (see the browser status line (usually at the bottom of the browser pane) for the contact velocity.
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Version 1.08 fixes the "zero throttle start flame off bug." Thanks to Captain for reporting it!
Version 1.09 adds the feature to use the spacebar for button action for "hands-off-the-mouse" operation (for pilots with the right stuff).
Version 1.10 (July 7, 2008) incorporates finer granularity of the flame length for a more natural feel.