Balloon Powered Car

I made a balloon-powered car from tinkercad because I always wanted to become an engineer, so I thought that this would be an excellent first step.

computer or phone internet access

Go to tinkercad.com and sign in

place a box on the workplane size it to be 20mm wide,60mm long and 20mm tall

place a cylinder on the workplane and size it to 11mm in diameter and 20mm tall change the cylinder to a hole and rotate the cylinder 90 degrees so the long direction crosses through the body

select the box and cylinder and align them to the bottom of the box, the end of the box and the center of the box move the hole 5mm to the left away from the end of the box lift the cylinder up 3mm away from the workplane

duplicate the first hole by using ctrl+c and ctrl+v change the grid to 5mm then move the second cylinder 40mm away from the first

group all shapes into a single item. place wedge shape on the work plane and size it to be 5mm tall 20mm wide and 40mm long change the wedge to a hole

rotate so the flat face is facing upwards align them to be the max on the left the top and the center group them into a single item

place a wedge make it 20mm wide 10mm long and 15mm tall then align them to the center of the car

Drag a cylinder to the work plane and size  it to 20 mm in diameter in 10 mm tall

 place a second cylinder in the center of the previous cylinder and size it to 23 mm in diameter and 3 mm tall

 select both cylinders and align them vertically then align them to the top

 with both cylinders selected group them into a single object

Place a cone shape on the workplane and size it to be 23 mm in diameter and 12 mm tall rotate the shape 180° so the flat surface is facing upwards

 align the cone so that it is touching the bottom of the lip and centered on it  select the shape and group them into a single item

Locate the purple bent pipe shape and then drag the shape to the workplane

 all this shape is selected you will see a number of settings that can be changed in the inspector panel

 set the outer pipe width to 3 mm

 now use the sliders for the other settings to adjust the other settings to create an air channel that creates a path from the back of the car to the balloon connector

 when you're happy with your air channel design select the shapes that make the channel and group them together

 note: make sure there's a clear path through the channel for air to escape

 note: make sure the air channel doesn't break through the axle opening or all the air will escape into the axle in your car will not move forward

 set the air channel shape to be a hole

 select the body and the air channel and group them into a single item 

Place a cylinder on the work plane and size it to 20 mm in diameter and 10 mm tall

 place a second cylinder on the work plan in size is a 10.5 mm in diameter and 10.5 mm tall

Change the second cylinder to a  hole

 select both cylinders and  align them vertically

 group both shapes into a single item to cut the hole through the wheel 

Place a cylinder on the work playing in size it to 10 mm in diameter and 45 mm tall

 select the cylinder and wheel and Align them vertically

Select the wheel and duplicate the wheel

 use The Black Arrow on top of the shape to lift it off the work plane

 align the wheel to the other end of the axle 

Select both wheels and the axle and group them into a single object this is a temporary group to help while positioning the axle

 rotate the axle and wheel 90° to line up with  the axle hole

 position the axle through the axle hole

 once the axle is in the proper position select all the shapes in the design including the body and the axles and press D on the keyboard to lift them to the work plane

Let the rear axle group and click duplicate on the toolbar

 move the new axle into position on the front axle hole

 when in position select both of the axle groups and select ungroup