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Hydrogen Properties for Energy Research (HYPER) Lab Dr. Jacob Leachman




To provide transportation of the rock crusher to and from the storage location while traveling through unknown or rough terrains


Team members: James Crews, Qusiy Almukhaini, Muayad Alaraimi, Daniel Stakhovich, Muayad Aljabri, and Andrew Underhill


Initial Design

We considered multiple different options when initially coming up with ideas of designing a way to transport the rock crusher from area to area. These ideas included human power in the form of pushing or pulling, vehicle power such as attaching it to a car or bicycle, and even attaching it to animals using a harness. By analyzing the needs of the women in Uganda as well as the available resources they are working with we narrowed it down to these three paradigms that we thought were the most realistic for the situation at hand.


bicycle_ambulance_480One of our final ideas was to use a bicycle that has a trailer system attached to the back of it that would have the rock crusher mounted to the frame of the trailer. Bicycles are available throughout Uganda and there are also several donation charities throughout the US that donate used bicycles throughout the world so accessing them wouldn’t be difficult. The frame would simply be made out of wood that the rock-crusher would be attached to. This design would be easy labor for women when moving through the difficult terrain.


Animal Power:

animal ugandaAnother idea we proposed was having the rock-crusher be transported via animals. Similar to the bicycle idea this would essentially be a trailer system with wheels attached to a frame but this idea would include a harness that could be strapped to cattle to transport the machine. This would take all the labor of moving the machine around off of the women, however for this idea to work the women would need to own cattle.

Cart Design:

cart ugandaOur final design idea was to essentially have the rock-crusher be placed in a cart that would have two wheels and two handles in the front to be pulled from place to place. These types of carts can be found throughout Uganda so they would be readily available. The problem with this design is depending on the size and weight of the final design for the rock-crusher system this idea might be some what of a physical challenge for the Ugandan women using the rock-crusher.



Final Decision:

bike trailerThe bicycle and trailer option seemed like the most ideal option out of our three ideas to fit the needs of the Ugandan women. With the availability of materials combined with the ease of operation it was the clear option to choose from our three paradigms.

In working with the power team we came up with a system that would allow the rock-crusher design to be transported around via a bicycle-trailer method, then once arriving to the desired location that same bicycle could be unhinged and used to power the actual machine. A stand would then be attached to the front of the trailer to support it while the bike powers the machine. This would keep required materials as well as overall cost to a minimum by utilizing one bike for two aspects of the design.



  • We firstly drew the entire design to choose the right measurements based on the sorting dimensions.
  • Using 1.5”x3”x8’ wooden beams, we assembled the cart with the required screws.
  • We attached the two tires to an all thread rod that has a length of 3 feet and we screwed that rod to the middle of the cart from beneath the cart.
  • Finally we used some bosh tubes and a bike trailer hitch part to integrate the cart to the bicycle.
Material Quantity Cost
Wooden beams (8ft) 3 $15
Screws (3.5 in) 25 $6
Bicycle tires 2 Free. Can be bought for around 10$ each
All thread rod (3ft) 1 $5
Nuts (1 in) 4 $1
Bosh Tubing (3ft) 2 $8
Bike hitch 1 $35 but can found cheaper.
Total Cost: $70-80
Washington State University