Digging for info - front drum explosion on 727s

a70duster said

I don't agree with your explanation of the torque converter sprag lockup with regards to a dry hop. The car is brought up to launch RPMs. The stator is put into lockup mode after some throttle and stays locked up after the launch. Then the car coasts about 10 feet with no throttle applied.

I'd agree that if you're ON-OFF-ON the throttle that would be bad for any sprag BUT that throttle action doesn't happen in a dry hop.

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My understanding is if the "dry hop" happens to be not-so-dry & You hit it, if the tires spin unloaded for a split second then hook, the stator sprag goes from freewheeling to locked in the juice wheel...like neutral dropping it..it may not explode, but could be damaged & just seize, and the converter is junk.
Also, depending on the condition of the surface (& I'm no Pro Drag Racer here), some have told Me the dry-hop messes up the surface of the slick. They state the best traction is rolling out & backing of before they can "bite", and the first "bite" is the best, a dry-hop wastes it. You Pro's here can chime in & correct Me (or argue, :p) if You have a different experience/opinion.