I don't know what's more impressive. An HP-14 breaking the sound barrier or the 1-26 chase plane. And they say that the 1-26 doesn't penetrate well. Hog wash! (This is an April 1, 1999 picture taken from the York soaring club site http://www.yorksoaring.com. Source: Wayne Paul, Schreder Sailplane Designs - http://www.soaridaho.com/Schreder)