PROTOTYPE #7

Because the tennisball got affected by the sandpaper, we searched for something new to make the wheels addhesive. We attached balloons on the wheels for the next test. As you can see on the picture below, the balloon didn't last very long.

CONCLUSION

Expected positive feedback:
The ball goes higher and further then without the balloons. And the ball isn't affected.

Unexpected positive feedback:
/

Expected negative feedback:
/

Unexpected negative feedback:
The ball doesn't go as far as the prototype with the sandpaper.
The balloon breaks after a few launches.

Makeability score: 2

PROTOTYPE#6b

The prototypes launched the balls horizontal. Now we put the prototypes in an angle, so the ball can fly higher.

CONCLUSION

Expected positive feedback:
The ball goes higher and further then before.

Unexpected positive feedback:
/

Expected negative feedback:
The ball gets still affected by the sandpaper.

Unexpected negative feedback:
/

Makeability score: 2

PROTOTYPE #6a

To make the wheels more adhesive, we put sandpaper on it. If we launch the ball now, the difference is quite big. The ball goes further but tennisball gets affected by launching it with sandpaper, as you can see on the picture.

CONCLUSION

Expected positive feedback:
The wheels have more effect on the ball.

Unexpected positive feedback:
The ball goes further then we thought he would.

Expected negative feedback:
/

Unexpected negative feedback:
The ball gets affected by the sandpaper.

Makeability score: 2

PROTOTYPE #5

We made the wheels bigger (diam. 40mm) and launched it again. The ball went further then before, but still not far enough. We think the wood is to slippery to have enough effect on the ball.

CONCLUSION

Expected positive feedback:
It goes further then with the smaller wheels.

Unexpected positive feedback:
/

Expected negative feedback:
Still not far enough.

Unexpected negative feedback:
The wood is to slippery to have enough effect on the ball.

Makeability score: 2

PROTOTYPE #4b

We made sure the tape was firm enough to stay on the wheel with another tape on top of it. This made the wheels a little big bigger to. 

CONCLUSION

Expected positive feedback:
The ball was launched and the tape stayed on the wheel.

Unexpected positive feedback:
/

Expected negative feedback:
Not enough power to launch very far. That's probably because the wheels aren't close enough to eachother.

Unexpected negative feedback:
/

Makeability score: 2

PROTOTYPE #4a

This prototype is based on the system of benchmark #11. It's a good system to attach to a wheelchair because it's compact and quite lightweighted. Because the wheelchair works on 12 V, we used the same motors to build this system. That's because we connect and use the batteries of the wheelchair to launch the ball.

The wheels are made of wood (diam. 35mm). The distance between the wheels is the size of a tennisball (6.7 cm).

Because the tape came loose, we didn't manage to launch a ball with it yet. 

CONCLUSION

Expected positive feedback:
/

Unexpected positive feedback:
/

Expected negative feedback:
/

Unexpected negative feedback:
The tape comes loose.

Makeability score: 2

PROTOTYPE #3

We used Benchmark #13 to develop this prototype. The swing is pulled by a cord and released to launch the ball. 

By testing this prototype, we realised it doesn't work, the ball simply doesn't come out of the thrower. 

CONCLUSION

Expected positive feedback:

/

Unexpected positive feedback: 

/

Expected negative feedback:

Not enough power to launch very far.

Unexpected negative feedback:

The ball doesn't even come out of the thrower.

Makeability score: 4 (quite easy to make)