sketch 1
sketch 2
sketch 3
consider model following STEP 1 light weight.
sketch 3 design the isolate front as easy as possible that meet the suspension point but sketch 3 make the low node. Therefore, sketch 3 are imperative to add member of side impact to meet the regulation but will increase weight.
" The sketch 3 was eliminated from consideration. "
consider model following STEP 1 easy to maintain and safe to repair.
Isolate rear of sketch 1 has more complex that sketch 2. internal component will be difficult to install. including repair.
" The sketch 2 WIN"
the sketch 2 was choose, the next step is draw in fusion 360. determine the position of the main hoop and front hoop form the suspension points, cockpit opening and regulation.