From http://www.spaceflightnow.com/ss1/040929x1launch.html

"Rutan said SpaceShipOne is particularly susceptible to rolls and has
been from the beginning.

"The airplane, since its early testing, we've been living with a known
deficiency," he said. "It's difficult to fix once you have an airplane
flying. It's easy to fix on the second airplane and we have very good
fixes for excess dihedral effects on our next spaceship."

He said Melvill's ability to easily overcome the roll proved the
spacecraft is more robust and, by design, forgiving than any other
manned spacecraft."



Kyle Boatright wrote:
Any rumblings from the desert on the cause of the roll problems during
yesterday's flight?

I know Melville said he might have stepped on something, and Rutan was
quoted as saying wind shear might cause a roll problem, but neither one
appeared to have much confidence in their answer.

An uncommanded roll like that would probably cause a permanant crease in my
seat cushion.

KB