1452 Kts Groundspeed is the fastest I have seen. - and yes it was in a Pig. [Mach2.5 and accellerating ](Not on the deck mind you - I only seem to recall 705K G/S - Not the record, but at least we did it for 300 miles!, somewhere off the Phillipines ISTR) However, on the deck, I have been faster, just never looked down to check - little busy doing the lookout piece whilst the radalt pings 90' - oops. Pity we had to slow down a tad to drop some of the 'old school' bombs we had in the '80s and '90s. ....and yes the F model would hum - but not quite for as long as the 'C'. At height, I'm convinced it (F-111C) would have done M3.....(probably about the time the paint would have melted). F111F is a little slower at height.