<VV> Broken fan belts

[Levair at aol.com]

All,

A strange problem. 
  I haven't actually thrown a fan belt in years, although sometimes they get 
so worn and so stretched that they won't follow the pulleys.
  After a recent run in the Thomas/Roe car, I literally ripped a nearly new 
belt apart. Just broke it in two.
   I was running without the windshield, so more air was going through the 
rear scoop. I had installed a plenum from the scoop to the fan inlet. These were 
all first time experiments. 
   I am assuming that the forced air is denser and the fan is almost pumping 
liquid. 
   I had this happen in the 70s on my race Stinger. I had plumbed two 8" 
ducts to the fan inlet from the headlight openings. I immediately broke a new fan 
belt. Removing the fan plenum temporarily solved the problem. I cured this 
later by not running a fan at all---another story. 
   I'll temporarily remove the plenum on the Orange car. 
   Any one else ever have this happen.?

Warren