They should make them out of something they front won't fall off of.  Like, cardboard is out right.,(reply>), @Tobias Zauzig <br>+ No paper. No cello tape. <br>- Rubber? <br>+ Rubber's out. They gotta have a steering wheel. They have a minimum crew requirement. <br>- Whats the minimum crew? <br>+ Uhh....one I suppose.,(reply>), what about paper?,(reply>), Water + cardboard =soggy