I've used flex fans in the past, as have friends of mine. They have
one bad habit which is very nasty. They tend to fling their blades
off. This has a negative effect on the bonnett, as that seems to
be the only direction the blades go when they get flung off. The
vibration that results from the missing blade promptly breaks the
rest of the blades off as you try to limp your way home.
I do like electric fans. The later so equipped Spitfires are a pretty
good indicator of how well they work, since Triumph reduced the
size of the radiator greatly when they went with the electric fans,
and the later Spitfires so equipped are not the ones you hear
constant overheating complaints about. Electric fans have the
great advantage of pulling air through the radiator with enthusiasm
when you're sitting idling in stopped traffic. That's not something
the mechanical driven fans do.
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