How big should my drop in be??

I setup a rail in my backyard (which is flat) and built a drop in that's about 4 feet high. whenever I try to hit the rail i don't get enough speed.. How big should the drop in be to get sufficient speed
 
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Im sure I can salvage some snow, ill use some random boxes and stuff like that to full space. Should the slope be steeper or longer to get maximum speed?
 
This is when it was partially complete we added extensions to the legs screwed the last pvc on

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ps: sorry for the crooked pic
 
if its as short as it looks i would put the jump on a down rail or on top of a small hill to get a little more speed
 
yea its not the best picture here its about 5ft - 5 and half ft but its taller now it works pretty good because of the pvc you just slide like lightning
 
thanks man thats too sick i now have a new project, my last one i just played by eye and made it as i went, using scrap wood from my garage
 
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