RE: Really want to go fast??
We land them on grass and on pavement. For grass, it's usually not needed to push after touchdown, as the grass slows the plane down pretty effectively. On pavement, we sometimes push on the stick after landing to force the muffler into contact with the pavement as a brake. This works with Q500 as well. For those of you who don't race, you do have to set up your prop so that it stops in the horizontal position, as these engines are landed at dead stick, since there is no idle.