Saving the World One Tennis Ball at a Time
Both cleanly powered and built from 2 recycled bicycles, scrap steel and wood, leaking 5 gallon water jug and a lacross stick, our pedal powered tennis ball launcher was created as a unique entry for the innovate or die pedal powered machine contest.
The team was comprised of:
High Speed Videos of Launcher in Action:
300 frame per second high speed video taken with the Casio Ex-F1
600 frame per second high speed video taken with the Casio Ex-F1
Components for the trailer frame were scavenged from an old child trailer, including the wheels, axle, and hitch that connects to the bike. The frame is constructed from 2x4's and 2x2's.
The drive mechanism is built entirely from scrap bike parts. The bike wheel rolls on a bike hub. A chain links the hub to a sprocket welded to a bike headset, which is used as a bearing block. A drive shaft connects to the other end of the headset to transmit power to another headset bearing block with welded sprocket. A chain goes up from there to the freewheel of a 20 inch bike wheel. The chain does not wrap around the freewheel, because I needed to reverse the direction of rotation of the launcher wheel. The video below shows the details of the drive mechanism.
Video below is from a news show in Tokyo. According to a friend, this is what they are saying:
"They are talking about the young engineer, who lives in Atlanta, developed a 'new automatic tennistraining machine' with his friend.
However, they are also talking and laughing ''Don't you think that throwing by hand or using a racket is easy and convenient for training??'' and also talking ''It is very good for their health, because they can use their extra calories on the bicycle!''
Finally, they are talking about the famous Japanese comedian named 'Mr. Bando' (but he was used to be a famous professonal baseball player 40 years ago).
He is also very famous that he loves boiled egg (actually, he eats 20 (or more) boiled eggs every day). Therefore, two MC guys told 'If the thrown tennis balls were boiled egg, Mr. Bando will jump and eat the thrown boiled egg easily like a young athlete "