Leaf blowers are not going to offer enough lift or propulsion for the cart. When myth busters did this they gave the weight to lift ratio and even then the lift way only minimal.
However if you are looking to really make something like this work you are going to need the right engines...
You are going to need at least 2 Aerobot specs here: http://www.moller.com/aerobot.html company link here: http://www.moller.com/ just to get the proper lift and thrust. Steering and breaking is going to be a lot more difficult. And you are going to need a computer controller to regulate the lift and thrust as well as balance and breaking.
Just making it hover on a thin film of air not possible with leaf blowers it barely holds a person, let alone the weight of the entire vehicle frame and control systems.
I love the soap box derby idea and rigging a trike setup to drive backwards would simulate the motion of the real vehicle. That is probably the safest way and most economical, unless money isn't an option, then go with the Aerobots I think they are only like $10,000 a piece.
However if you are looking to really make something like this work you are going to need the right engines...
You are going to need at least 2 Aerobot specs here: http://www.moller.com/aerobot.html company link here: http://www.moller.com/ just to get the proper lift and thrust. Steering and breaking is going to be a lot more difficult. And you are going to need a computer controller to regulate the lift and thrust as well as balance and breaking.
Just making it hover on a thin film of air not possible with leaf blowers it barely holds a person, let alone the weight of the entire vehicle frame and control systems.
I love the soap box derby idea and rigging a trike setup to drive backwards would simulate the motion of the real vehicle. That is probably the safest way and most economical, unless money isn't an option, then go with the Aerobots I think they are only like $10,000 a piece.