Object fell from an airplane

[NoHeat]

Over 1000 HP motors in some of those tub grinders that do heavy chipping.

http://www2.vermeer.com/vermeer/NA/en/N/equipment/tub_grinders

I wouldn't want to be the insurer for the contractor who has one.

 

[N801BH]

Congrats to Rv10flyer and El Paso Pilot for correctly guessing this on the first page of this thread!

Here's a picture of a "grinding tooth" and it does indeed look like the roof-penetrating missile:

....

Well... At least I got the one block close right...

 

[flyingron]

I've rented those monster chippers (12" bore). It doesn't surprise me that it could chuck parts a ways. The thing had a large diesel engine and weighed in excess of 5000 lbs.