Replying to How do you 270 to urban style rails?

i wanna try 270's onto urban style down rails this year but im not sure how.  id do it onto something with a pretty good size jump on first try, like mabye only a foot lower than the rail.  it seems like you would kinda do a slower 90 to make sure your tips clear then whip around the 180 real quick, so like 90 late 180.  or do you just spin fast from the begining?  the only real thing im scarred of is hitting my tips or something. so can someone help?