The RT-9000 is available in three engine variants, each designed for a specific use case:
The Prophet engine is the most versatile of the three, suitable for both heavy-duty excavation and light gardening tasks.
The Doubt engine is for when you're not really sure what you're doing. It's for those 'experimental' projects or when you just want to see what happens if you mix a bunch of dirt and metal together.
The Sceptical engine is for the ultra-cautious user. It's for when you've seen one too many rototiller commercials on late-night TV and just want to make sure you're not wasting your money.
Each engine type comes with its own unique set of features and specifications. Check the individual engine pages for more information.