Blazinghand is correct, however you can still reach quite a bit without webwaying(?) them.
With a transport you can give them almost 3" more so 3+8+D6+3+2D6 = 25" charge on average.
Throw matchless agility on them for another +2.5".
Most powerful is to cast quicken on them though 8+D6+8+D6+3+2D6 = 22" minimum, average: 33.5"
Quicken + matchless agility + transport + saim-hann would give them:
3+8+6++8+D6+3+2D6= 40,5" charge on average.
I think it's a nice tool to have especially if you need to fill Elite and/or HQ slots.