It probably went lean, you should have pulled the throttle back to about half and leveled out. I lost many an airplane like that. Remember the pull the throttle back thing, but don't forget to level out too... I recently lost a Cessna 180 Skylane the same way. I was taking off, had just switched from 20/20 to 15/15 fuel, and a guy fired up his 2 stroke as I was headed for the runway. I hit the throttle and it took off, then went lean, but I couldn't here it slow down over the other engine. I just saw the plane stop and fall. lol Oh well... The Saito 56 and electronics are going in the Pitts now...
I really don't know where my hobby guy got the Pitts. Some clearing house in Chico, or Sacramento, Calif I think. I asked him the other day, but he couldn't remember...