G...platz
full airbrake in the Javelin but they didn't open fully above 535 kts
I think there’s a slight confusion of limiting airspeeds here, 535KIAS was the never exceed limit for the aircraft (on account of the risk of elevator flutter); the speed above which the airbrakes would open only partially was more like 450KIAS. Closing the throttles and selecting them out at this speed in level flight gave about a 1G deceleration, which was thoroughly noticeable.
Coffman
XH764 in their logbook per chance?
I can come close with XH763 & 766, if there’s a prize for also rans