1. after thrust is lost in the rotors it liked to tuck - big dragy nose with a little horizontal stabilizer
2. lots of customers and not enough testing and making a helicopter that didn't require extraordinary skills to pilot
3. customers who were expecting a Hughes 500
4. Landing gear design failed quickly at design load and did not fail in a controlled fashion = tip over
5. ballast in skids became a deadly projectiles going into cockpit
6. keel would absorb energy in impact releasing same energy into pilots ass
7. frame cracked / design was a quick & dirty thing
8. company fractured as groups fought for 'control' of the product. = No real fixes, SBA loans came due & flooding didn't help
9. two per caused havoc to airframe
10 high accident rates and lots of fatales ...
The mini 500 was an unforgiving helicopter in emergencies released on an unsuspecting dumb public
Dennis would release any and all accident reports on his machine to anyone and it was quite a few . . .
That's why he went to drones
The Mini flooded the market at the same time BJ came out with the helicycle = Killed the market/