This trick only works with jets that have high speed and can go over 40,000 feet in altitude (X-02, S-37, Su-37) .Press R2 to go way up holding down over 40,000 feet (near space). Keep going in a circle while R2 is held. Go up and down slightly until the speed reaches 1665, then dive. If done correctly, when you dive the impossible speed should be about 1788 (if fast enough). Actually it will be about 1725. Note: Try practicing this trick in free flight mode.