The Fan Belt from Germany
Okay, okay, here we go.
On this week’s Car Talk, my brother and I, the internationally ignored Click and Clack, present another one of our historic, folkloric, possibly even automotive puzzlers. Picture this: it’s 1936. Europe’s about to blow a gasket, and in some secret room in Germany, a bunch of very serious officers are staring at the blueprints for their brand-new personnel carrier.
Everything’s perfect. The engine, the suspension, the cup holders, probably. Then one officer stands up and says, “Vhat about ze fan belt?” It’s a flat rubber belt, looks like something you’d hold up your lederhosen with, and the engineer proudly announces it’ll last 30 to 40,000 kilometers.
“Not good enough!” says the officer. “Ve need 60,000! Our soldiers cannot be out dere in ze middle of battle tinkering mit ze fan belt!”
Now, one wise guy suggests, “Hey, it’s flat. Just flip it over.” Nope. Unacceptable. And they’re not allowed to change the material either. No Kevlar, no space-age polymers, no nylon stockings. Same belt.
So the engineers huddle for about two minutes, scratch their heads, adjust their slide rules, and come up with a clever design change that magically doubles the belt’s life to 60,000 kilometers without changing what it’s made of.
And that’s the puzzler, dear listeners. How’d they do it?