1. The problem statement, all variables and given/known data Basically, using only a hair dryer as the source of energy, students need to create a machine that will lift a maximum amount of weight. Students get graded according to who can lift the heaviest weight. The record seems to be around 40kg... 2. Relevant equations Can anyone inspire me a few ideas on how to achieve this?? 3. The attempt at a solution All I can think of is creating some sort of 'turbine' that would catch the hairdryer's air and rotate the turbine to lift the weight (creating mechanical advantage using pulleys or something like that)..... ==== EDIT - here are the complete rules: the "Heavy-Weight Lifting Machine" - design&build a machine that lifts as much weight as possible up to a height of 110cm in any given time (meaning it could take a year to lift). The machine has to lift a min. of 260 grams. But the grade depends on the rank of the heaviness of the weights lifted. For example, if I lift 300g, and some other guy lifts 40kg, I will get a lower grade than he does.... pretty simple. :( Additional Rules: 1. The hairdryer can be the only source of power. It can be the ONLY TYPE of power that supplies the power - so I CANT batteries using the hairdryer.... I also can't use the motor inside the hairdryer directly - like taking it out and doing something with it. 2. No counter weights - I can't drop a heavier weight to lift another object 3. ANY materials can be used to build the machine (metal, paper, foam, string, wire, etc), - BUT the total cost of the machine CANT exceed $25. BUT the items being used CAN be those that are recycled. For example, if I happen to have a "combustion engine" lying in my backyard, I could use it... Only I don't have a combustion engine lying in my backyard. 4. The machine can be set on a chair, floor, desk - anywhere. 5. The hairdryer can be moved around using my hands... THOSE are the ONLY rules there were given. No more, no less!