I used to do that stunt with my Scat Cat 500 all the time - go up 800 - 1000 feet, then straight down full throttle . Hard pull-out and low fly-by. Of course the Scat Cat has a huge maple block running from gear to gear, and I hit the center section with a 7" wide piece of heavy fiberglass. Boy howdy did that Irving .40 Mk II ever scream on that down hill express......still have the plane sitting here to this day too.....

Hogflyer