I don't know man... if you're asking I assume 30ft doubles will be a little big to start... those plans from dirtwerkz are for big bikes... For an experienced rider with space there are guys going 30, 40, 50 ft or more...
Just make tables if you have the dirt, the land, and a tractor... make it safe and go from there... the more space you have the bigger you can go I suppose...
I'm no pro and my track is real small (1/3 acre)... but...
I have a double(10ft), double(12ft), double(12ft) section...
My "big" jump is a 25ft double with a table top landing... I have a couple more 10-12 ft tables...
My whoops section is a 10 pack spaced about 3-4 ft apart...
I have a dragonback too... shaping and working on that...
Just got the ok to start stage #3 on my track... tunnel jump is going in... jumps are going bigger!
Now get out there and build and keep us posted!
