Mobile Barbecue Stove
Hmmm, I modeled this for a contest but couldn't upload ontime :(. Now this is not a part of any contest but a portfolio only.
This design is based on a simple principle, that is widely used in African villages: the Rocket Stove (see: (hidden) Rocket Stoves use a third of the fuel provided, emet up to 75% less smoke compared to open firesand therefore, they are a great alternative to the polluting barbecue.
Sell price it in 650-USD.