Statistics:
Length(fighter): 40 ft.
Width(fighter): 23 ft.
Height(fighter): 16 ft.
Length(walker): 29 ft.
Width(walker): 23 ft.
Height(walker): 20 ft.

Crew: 4(1 pilot, 1 gunner, 2 passengers)

Weapons:
3x machines guns(1 is used in fighter mode, 2 more are hidden near the cockpit and used in episode 37).
2x missile racks w/ 5 missiles each
1x laser
1x ring shooter(used to shoot a power ring to power up Sonic. Located behind the front landing gear).

Transformations:
Plane
X Cyclone(walker, turns main engines into a pair of legs)
Battle Armor (only used once in episode 29 of Sonic X, main engines become arms and is armed with a sword and shield. Had no safe way of landing)
Air Booster(used in episodes 8, 15, and 29. The plane elevates its main engines upward to expose its rear-mounted afterburner to give the plane increased speed).

Facts
When it is first used in Episode 8 and in Episode 9, it is used without a Chaos Emerald. This was undertaken to make sure that it worked right before taking the test runs further by installing the emerald.
Ella flys it in episode 20.
Episode 63 marks the only time that Sonic ever flew it.
Episode 9 was also the only time the X Tornado carried non-humanoid and non-emerald cargo. In that episode, it carried a bunch of beach toys to the beach(they were piled in the very last seat).
It is possible that the X Tornado was originally designed to only have 2 seats when Tails and Chuck are looking at its blueprints, because Chris requested that there needed to be at least one more seat installed(because he wanted to come with Sonic on his adventures).

X Tornado - Sonic X/Sega