"a general rule i learned for quads at rcgroups: find the total thrust for half of the motors...that needs to be >= the AUW. flybrushless is an awesome site!"

"get some 10mm square aluminum tube from your local hardware store. drill two holes at each end(for center hub and motors), get some sheet aluminum or CF drill some holes in it for the arms that from before, use some little hex bolts + nuts to hold…"

"im new here too... but i think i can give you an answer:
it all depends on the design you use, and im not sure but i dont think x or + will make much of a difference. i would think a heavier and more powerful quad would do better. good sensors…"