Not quite a thunder MF, but close relative. As an aside, the motor is actually 5ftlb, so more like a 3.75hp, which must do well on a 20in in long grass.

The other thing is 2 I have seen have a novel way of ensuring the crank doesn't bend when the solid bar blade hits an immovable object

The deck is so thin that the motor is ripped through its mounts!