Eurytus, you are right, that Nazgūl was not send to Isengard because of Pippin. I made a mistake [img]smilies/frown.gif[/img]
But look at Gandalf's words [img]smilies/wink.gif[/img]:
Quote:
'It is two hundred leagues or more in straight flight from Baraddūr to Orthanc, and even a Nazgūl would take a few hours to fly between them.'
The Palantir; The Two Towers
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A league is about 3 miles, that means that a winged Nazgūl can cover 600 miles o more in a few hours. In my opinion, the expression 'A few hours' cannot mean more than 6 hours. So, the minimum speed for the Nazgūl would be of 100 miles per hour (600 miles or more in 6 hours or less).
Again, that is a very high speed, which would allow a Nazgūl to fly from Dol Guldur to the Morannon in less than 4 hours. Plenty of time for participating in the attacks to Lorien and getting to the Morannon on time. [img]smilies/wink.gif[/img]
(In the same chapter it is also said that winged Nazgūl can fly at a speed grater than any wind of Middle-Earth. That reinforces my opinion that they could fly faster than 100 miles per hour. [img]smilies/eek.gif[/img] )