[suicideneil]

A slightly slower kv motor and slightly high mah 4s lipo would be perfect for a 20 minute race in my eyes. Maybe 1700-2000kv, but definately atleast 70mm or 1512 sized or larger. Depends what you can find really, or how much you're willing to fork out- Cant speak from experience but I would look in the buggy section to see what others are using in similar setups to get good runtimes- there are a few runtime related threads around too so its worth having a bit of a dig.